/****************************************************************************** * * * N O T I C E * * * * Copyright Abandoned, 1987, Fred Fish * * * * * * This previously copyrighted work has been placed into the public * * domain by the author and may be freely used for any purpose, * * private or commercial. * * * * Because of the number of inquiries I was receiving about the use * * of this product in commercially developed works I have decided to * * simply make it public domain to further its unrestricted use. I * * specifically would be most happy to see this material become a * * part of the standard Unix distributions by AT&T and the Berkeley * * Computer Science Research Group, and a standard part of the GNU * * system from the Free Software Foundation. * * * * I would appreciate it, as a courtesy, if this notice is left in * * all copies and derivative works. Thank you. * * * * The author makes no warranty of any kind with respect to this * * product and explicitly disclaims any implied warranties of mer- * * chantability or fitness for any particular purpose. * * * ****************************************************************************** */ /* * FILE * * dbug.c runtime support routines for dbug package * * SCCS * * @(#)dbug.c 1.25 7/25/89 * * DESCRIPTION * * These are the runtime support routines for the dbug package. * The dbug package has two main components; the user include * file containing various macro definitions, and the runtime * support routines which are called from the macro expansions. * * Externally visible functions in the runtime support module * use the naming convention pattern "_db_xx...xx_", thus * they are unlikely to collide with user defined function names. * * AUTHOR(S) * * Fred Fish (base code) * Enhanced Software Technologies, Tempe, AZ * asuvax!mcdphx!estinc!fnf * * Michael Widenius: * DBUG_DUMP - To dump a block of memory. * PUSH_FLAG "O" - To be used insted of "o" if we * want flushing after each write * PUSH_FLAG "A" - as 'O', but we will append to the out file instead * of creating a new one. * Check of malloc on entry/exit (option "S") * * Sergei Golubchik: * DBUG_EXECUTE_IF * incremental mode (-#+t:-d,info ...) * DBUG_SET, _db_explain_ * thread-local settings * negative lists (-#-d,info => everything but "info") * * function/ syntax * (the logic is - think of a call stack as of a path. * "function" means only this function, "function/" means the hierarchy. * in the future, filters like function1/function2 could be supported. * following this logic glob(7) wildcards are supported.) * */ /* We can't have SAFE_MUTEX defined here as this will cause recursion in pthread_mutex_lock */ #include #undef SAFE_MUTEX #include #include #ifndef DBUG_OFF #ifdef HAVE_FNMATCH_H #include #else #define fnmatch(A,B,C) strcmp(A,B) #endif #if defined(__WIN__) #include #endif /* * Manifest constants which may be "tuned" if desired. */ #define PRINTBUF 1024 /* Print buffer size */ #define INDENT 2 /* Indentation per trace level */ #define MAXDEPTH 200 /* Maximum trace depth default */ /* * The following flags are used to determine which * capabilities the user has enabled with the settings * push macro. * * TRACE_ON is also used in _db_stack_frame_->level * (until we add flags to _db_stack_frame_, increasing it by 4 bytes) */ #define DEBUG_ON (1 << 1) /* Debug enabled */ #define FILE_ON (1 << 2) /* File name print enabled */ #define LINE_ON (1 << 3) /* Line number print enabled */ #define DEPTH_ON (1 << 4) /* Function nest level print enabled */ #define PROCESS_ON (1 << 5) /* Process name print enabled */ #define NUMBER_ON (1 << 6) /* Number each line of output */ #define PID_ON (1 << 8) /* Identify each line with process id */ #define TIMESTAMP_ON (1 << 9) /* timestamp every line of output */ #define FLUSH_ON_WRITE (1 << 10) /* Flush on every write */ #define OPEN_APPEND (1 << 11) /* Open for append */ #define SANITY_CHECK_ON (1 << 12) /* Check memory on every DBUG_ENTER/RETURN */ #define TRACE_ON ((uint)1 << 31) /* Trace enabled. MUST be the highest bit!*/ #define sf_sanity() (0) #define TRACING (cs->stack->flags & TRACE_ON) #define DEBUGGING (cs->stack->flags & DEBUG_ON) /* * Typedefs to make things more obvious. */ #define BOOLEAN my_bool /* * Externally supplied functions. */ #ifndef HAVE_PERROR static void perror(char *s) { if (s && *s != '\0') (void) fprintf(stderr, "%s: ", s); (void) fprintf(stderr, "\n"); } #endif /* * The user may specify a list of functions to trace or * debug. These lists are kept in a linear linked list, * a very simple implementation. */ struct link { struct link *next_link; /* Pointer to the next link */ char flags; char str[1]; /* Pointer to link's contents */ }; /* flags for struct link and return flags of InList */ #define SUBDIR 1 /* this MUST be 1 */ #define INCLUDE 2 #define EXCLUDE 4 /* this is not a struct link flag, but only a return flags of InList */ #define MATCHED 65536 #define NOT_MATCHED 0 /* * Debugging settings can be shared between threads. * But FILE* streams cannot normally be shared - what if * one thread closes a stream, while another thread still uses it? * As a workaround, we have shared FILE pointers with reference counters */ typedef struct { FILE *file; uint used; } sFILE; sFILE shared_stdout = { 0, 1 << 30 }, *sstdout = &shared_stdout; sFILE shared_stderr = { 0, 1 << 30 }, *sstderr = &shared_stderr; /* * Debugging settings can be pushed or popped off of a * stack which is implemented as a linked list. Note * that the head of the list is the current settings and the * stack is pushed by adding a new settings to the head of the * list or popped by removing the first link. * * Note: if out_file is NULL, the other fields are not initialized at all! */ struct settings { uint flags; /* Current settings flags */ uint maxdepth; /* Current maximum trace depth */ uint delay; /* Delay after each output line */ uint sub_level; /* Sub this from code_state->level */ sFILE *out_file; /* Current output stream */ char name[FN_REFLEN]; /* Name of output file */ struct link *functions; /* List of functions */ struct link *keywords; /* List of debug keywords */ struct link *processes; /* List of process names */ struct settings *next; /* Next settings in the list */ }; #define is_shared(S, V) ((S)->next && (S)->next->V == (S)->V) /* * Local variables not seen by user. */ static BOOLEAN init_done= FALSE; /* Set to TRUE when initialization done */ static struct settings init_settings; static const char *db_process= 0;/* Pointer to process name; argv[0] */ my_bool _dbug_on_= TRUE; /* FALSE if no debugging at all */ typedef struct _db_code_state_ { const char *process; /* Pointer to process name; usually argv[0] */ const char *func; /* Name of current user function */ const char *file; /* Name of current user file */ struct _db_stack_frame_ *framep; /* Pointer to current frame */ struct settings *stack; /* debugging settings */ const char *jmpfunc; /* Remember current function for setjmp */ const char *jmpfile; /* Remember current file for setjmp */ int lineno; /* Current debugger output line number */ uint level; /* Current function nesting level */ int jmplevel; /* Remember nesting level at setjmp() */ /* * The following variables are used to hold the state information * between the call to _db_pargs_() and _db_doprnt_(), during * expansion of the DBUG_PRINT macro. This is the only macro * that currently uses these variables. * * These variables are currently used only by _db_pargs_() and * _db_doprnt_(). */ uint u_line; /* User source code line number */ int locked; /* If locked with _db_lock_file_ */ const char *u_keyword; /* Keyword for current macro */ } CODE_STATE; /* The test below is so we could call functions with DBUG_ENTER before my_thread_init(). */ #define get_code_state_if_not_set_or_return if (!cs && !((cs=code_state()))) return #define get_code_state_or_return if (!((cs=code_state()))) return /* Handling lists */ #define ListAdd(A,B,C) ListAddDel(A,B,C,INCLUDE) #define ListDel(A,B,C) ListAddDel(A,B,C,EXCLUDE) static struct link *ListAddDel(struct link *, const char *, const char *, int); static struct link *ListCopy(struct link *); static int InList(struct link *linkp,const char *cp, int exact_match); static uint ListFlags(struct link *linkp); static void FreeList(struct link *linkp); /* OpenClose debug output stream */ static void DBUGOpenFile(CODE_STATE *,const char *, const char *, int); static void DBUGCloseFile(CODE_STATE *cs, sFILE *new_value); /* Push current debug settings */ static void PushState(CODE_STATE *cs); /* Free memory associated with debug state. */ static void FreeState (CODE_STATE *cs, int free_state); /* Test for tracing enabled */ static int DoTrace(CODE_STATE *cs); /* return values of DoTrace. Can also be used as bitmask: ret & DO_TRACE */ #define DO_TRACE 1 #define DONT_TRACE 2 #define ENABLE_TRACE 3 #define DISABLE_TRACE 4 /* Test to see if file is writable */ #if defined(HAVE_ACCESS) static BOOLEAN Writable(const char *pathname); #endif static void DoPrefix(CODE_STATE *cs, uint line); static char *DbugMalloc(size_t size); static const char *BaseName(const char *pathname); static void Indent(CODE_STATE *cs, int indent); static void DbugFlush(CODE_STATE *); static void DbugExit(const char *why); static const char *DbugStrTok(const char *s); static void DbugVfprintf(FILE *stream, const char* format, va_list args); /* * Miscellaneous printf format strings. */ #define ERR_MISSING_RETURN "missing DBUG_RETURN or DBUG_VOID_RETURN macro in function \"%s\"\n" #define ERR_OPEN "%s: can't open debug output stream \"%s\": " #define ERR_CLOSE "%s: can't close debug file: " #define ERR_ABORT "%s: debugger aborting because %s\n" /* * Macros and defines for testing file accessibility under UNIX and MSDOS. */ #undef EXISTS #if !defined(HAVE_ACCESS) #define EXISTS(pathname) (FALSE) /* Assume no existance */ #define Writable(name) (TRUE) #else #define EXISTS(pathname) (access(pathname, F_OK) == 0) #define WRITABLE(pathname) (access(pathname, W_OK) == 0) #endif /* ** Macros to allow dbugging with threads */ #include static pthread_mutex_t THR_LOCK_dbug; static CODE_STATE *code_state(void) { CODE_STATE *cs, **cs_ptr; /* _dbug_on_ is reset if we don't plan to use any debug commands at all and we want to run on maximum speed */ if (!_dbug_on_) return 0; if (!init_done) { init_done=TRUE; sstdout->file= stdout; sstderr->file= stderr; pthread_mutex_init(&THR_LOCK_dbug, NULL); bzero(&init_settings, sizeof(init_settings)); init_settings.out_file= sstderr; init_settings.flags=OPEN_APPEND; } if (!(cs_ptr= (CODE_STATE**) my_thread_var_dbug())) return 0; /* Thread not initialised */ if (!(cs= *cs_ptr)) { cs=(CODE_STATE*) DbugMalloc(sizeof(*cs)); bzero((uchar*) cs,sizeof(*cs)); cs->process= db_process ? db_process : "dbug"; cs->func= "?func"; cs->file= "?file"; cs->stack=&init_settings; *cs_ptr= cs; } return cs; } void dbug_swap_code_state(void **code_state_store) { CODE_STATE *cs, **cs_ptr; if (!(cs_ptr= (CODE_STATE**) my_thread_var_dbug())) return; cs= *cs_ptr; *cs_ptr= *code_state_store; *code_state_store= cs; } void dbug_free_code_state(void **code_state_store) { if (*code_state_store) { free(*code_state_store); *code_state_store= NULL; } } /* * Translate some calls among different systems. */ #ifdef HAVE_SLEEP /* sleep() wants seconds */ #define Delay(A) sleep(((uint) A)/10) #else #define Delay(A) (0) #endif /* * FUNCTION * * _db_process_ give the name to the current process/thread * * SYNOPSIS * * VOID _process_(name) * char *name; * */ void _db_process_(const char *name) { CODE_STATE *cs; if (!db_process) db_process= name; get_code_state_or_return; cs->process= name; } /* * FUNCTION * * DbugParse parse control string and set current debugger settings * * DESCRIPTION * * Given pointer to a debug control string in "control", * parses the control string, and sets * up a current debug settings. * * The debug control string is a sequence of colon separated fields * as follows: * * [+]::...: * * Each field consists of a mandatory flag character followed by * an optional "," and comma separated list of modifiers: * * [sign]flag[,modifier,modifier,...,modifier] * * See the manual for the list of supported signs, flags, and modifiers * * For convenience, any leading "-#" is stripped off. * * RETURN * 1 - a list of functions ("f" flag) was possibly changed * 0 - a list of functions was not changed */ static int DbugParse(CODE_STATE *cs, const char *control) { const char *end; int rel, f_used=0; struct settings *stack; int org_cs_locked; stack= cs->stack; if (!(org_cs_locked= cs->locked)) { cs->locked= 1; pthread_mutex_lock(&THR_LOCK_dbug); } if (control[0] == '-' && control[1] == '#') control+=2; rel= control[0] == '+' || control[0] == '-'; if ((!rel || (!stack->out_file && !stack->next))) { FreeState(cs, 0); stack->flags= 0; stack->delay= 0; stack->maxdepth= 0; stack->sub_level= 0; stack->out_file= sstderr; stack->functions= NULL; stack->keywords= NULL; stack->processes= NULL; } else if (!stack->out_file) { stack->flags= stack->next->flags; stack->delay= stack->next->delay; stack->maxdepth= stack->next->maxdepth; stack->sub_level= stack->next->sub_level; strcpy(stack->name, stack->next->name); stack->out_file= stack->next->out_file; stack->out_file->used++; if (stack->next == &init_settings) { /* never share with the global parent - it can change under your feet */ stack->functions= ListCopy(init_settings.functions); stack->keywords= ListCopy(init_settings.keywords); stack->processes= ListCopy(init_settings.processes); } else { stack->functions= stack->next->functions; stack->keywords= stack->next->keywords; stack->processes= stack->next->processes; } } end= DbugStrTok(control); while (control < end) { int c, sign= (*control == '+') ? 1 : (*control == '-') ? -1 : 0; if (sign) control++; c= *control++; if (*control == ',') control++; /* XXX when adding new cases here, don't forget _db_explain_ ! */ switch (c) { case 'd': if (sign < 0 && control == end) { if (!is_shared(stack, keywords)) FreeList(stack->keywords); stack->keywords=NULL; stack->flags &= ~DEBUG_ON; break; } if (rel && is_shared(stack, keywords)) stack->keywords= ListCopy(stack->keywords); if (sign < 0) { if (DEBUGGING) stack->keywords= ListDel(stack->keywords, control, end); break; } stack->keywords= ListAdd(stack->keywords, control, end); stack->flags |= DEBUG_ON; break; case 'D': stack->delay= atoi(control); break; case 'f': f_used= 1; if (sign < 0 && control == end) { if (!is_shared(stack,functions)) FreeList(stack->functions); stack->functions=NULL; break; } if (rel && is_shared(stack,functions)) stack->functions= ListCopy(stack->functions); if (sign < 0) stack->functions= ListDel(stack->functions, control, end); else stack->functions= ListAdd(stack->functions, control, end); break; case 'F': if (sign < 0) stack->flags &= ~FILE_ON; else stack->flags |= FILE_ON; break; case 'i': if (sign < 0) stack->flags &= ~PID_ON; else stack->flags |= PID_ON; break; case 'L': if (sign < 0) stack->flags &= ~LINE_ON; else stack->flags |= LINE_ON; break; case 'n': if (sign < 0) stack->flags &= ~DEPTH_ON; else stack->flags |= DEPTH_ON; break; case 'N': if (sign < 0) stack->flags &= ~NUMBER_ON; else stack->flags |= NUMBER_ON; break; case 'A': case 'O': stack->flags |= FLUSH_ON_WRITE; /* fall through */ case 'a': case 'o': if (sign < 0) { DBUGCloseFile(cs, sstderr); stack->flags &= ~FLUSH_ON_WRITE; break; } if (c == 'a' || c == 'A') stack->flags |= OPEN_APPEND; else stack->flags &= ~OPEN_APPEND; if (control != end) DBUGOpenFile(cs, control, end, stack->flags & OPEN_APPEND); else DBUGOpenFile(cs, "-",0,0); break; case 'p': if (sign < 0 && control == end) { if (!is_shared(stack,processes)) FreeList(stack->processes); stack->processes=NULL; break; } if (rel && is_shared(stack, processes)) stack->processes= ListCopy(stack->processes); if (sign < 0) stack->processes= ListDel(stack->processes, control, end); else stack->processes= ListAdd(stack->processes, control, end); break; case 'P': if (sign < 0) stack->flags &= ~PROCESS_ON; else stack->flags |= PROCESS_ON; break; case 'r': stack->sub_level= cs->level; break; case 't': if (sign < 0) { if (control != end) stack->maxdepth-= atoi(control); else stack->maxdepth= 0; } else { if (control != end) stack->maxdepth+= atoi(control); else stack->maxdepth= MAXDEPTH; } if (stack->maxdepth > 0) stack->flags |= TRACE_ON; else stack->flags &= ~TRACE_ON; break; case 'T': if (sign < 0) stack->flags &= ~TIMESTAMP_ON; else stack->flags |= TIMESTAMP_ON; break; case 'S': if (sign < 0) stack->flags &= ~SANITY_CHECK_ON; else stack->flags |= SANITY_CHECK_ON; break; } if (!*end) break; control=end+1; end= DbugStrTok(control); } if (!org_cs_locked) { pthread_mutex_unlock(&THR_LOCK_dbug); cs->locked= 0; } return !rel || f_used; } #define framep_trace_flag(cs, frp) (frp ? \ frp->level & TRACE_ON : \ (ListFlags(cs->stack->functions) & INCLUDE) ? \ 0 : (uint)TRACE_ON) static void FixTraceFlags_helper(CODE_STATE *cs, const char *func, struct _db_stack_frame_ *framep) { if (framep->prev) FixTraceFlags_helper(cs, framep->func, framep->prev); cs->func= func; cs->level= framep->level & ~TRACE_ON; framep->level= cs->level | framep_trace_flag(cs, framep->prev); /* we don't set cs->framep correctly, even though DoTrace uses it. It's ok, because cs->framep may only affect DO_TRACE/DONT_TRACE return values, but we ignore them here anyway */ switch(DoTrace(cs)) { case ENABLE_TRACE: framep->level|= TRACE_ON; break; case DISABLE_TRACE: framep->level&= ~TRACE_ON; break; } } #define fflags(cs) cs->stack->out_file ? ListFlags(cs->stack->functions) : TRACE_ON; static void FixTraceFlags(uint old_fflags, CODE_STATE *cs) { const char *func; uint new_fflags, traceon, level; struct _db_stack_frame_ *framep; /* first (a.k.a. safety) check: if we haven't started tracing yet, no call stack at all - we're safe. */ framep=cs->framep; if (framep == 0) return; /* Ok, the tracing has started, call stack isn't empty. second check: does the new list have a SUBDIR rule ? */ new_fflags=fflags(cs); if (new_fflags & SUBDIR) goto yuck; /* Ok, new list doesn't use SUBDIR. third check: we do NOT need to re-scan if neither old nor new lists used SUBDIR flag and if a default behavior (whether an unlisted function is traced) hasn't changed. Default behavior depends on whether there're INCLUDE elements in the list. */ if (!(old_fflags & SUBDIR) && !((new_fflags^old_fflags) & INCLUDE)) return; /* Ok, old list may've used SUBDIR, or defaults could've changed. fourth check: are we inside a currently active SUBDIR rule ? go up the call stack, if TRACE_ON flag ever changes its value - we are. */ for (traceon=framep->level; framep; framep=framep->prev) if ((traceon ^ framep->level) & TRACE_ON) goto yuck; /* Ok, TRACE_ON flag doesn't change in the call stack. fifth check: but is the top-most value equal to a default one ? */ if (((traceon & TRACE_ON) != 0) == ((new_fflags & INCLUDE) == 0)) return; yuck: /* Yuck! function list was changed, and one of the currently active rules was possibly affected. For example, a tracing could've been enabled or disabled for a function somewhere up the call stack. To react correctly, we must go up the call stack all the way to the top and re-match rules to set TRACE_ON bit correctly. We must traverse the stack forwards, not backwards. That's what a recursive helper is doing. It'll destroy two CODE_STATE fields, save them now. */ func= cs->func; level= cs->level; FixTraceFlags_helper(cs, func, cs->framep); /* now we only need to restore CODE_STATE fields, and we're done */ cs->func= func; cs->level= level; } /* * FUNCTION * * _db_set_ set current debugger settings * * SYNOPSIS * * VOID _db_set_(control) * char *control; * * DESCRIPTION * * Given pointer to a debug control string in "control", * parses the control string, and sets up a current debug * settings. Pushes a new debug settings if the current is * set to the initial debugger settings. * */ void _db_set_(const char *control) { CODE_STATE *cs; uint old_fflags; get_code_state_or_return; old_fflags=fflags(cs); if (cs->stack == &init_settings) PushState(cs); if (DbugParse(cs, control)) FixTraceFlags(old_fflags, cs); } /* * FUNCTION * * _db_push_ push current debugger settings and set up new one * * SYNOPSIS * * VOID _db_push_(control) * char *control; * * DESCRIPTION * * Given pointer to a debug control string in "control", pushes * the current debug settings, parses the control string, and sets * up a new debug settings * */ void _db_push_(const char *control) { CODE_STATE *cs; uint old_fflags; get_code_state_or_return; old_fflags=fflags(cs); PushState(cs); if (DbugParse(cs, control)) FixTraceFlags(old_fflags, cs); } /** Returns TRUE if session-local settings have been set. */ int _db_is_pushed_() { CODE_STATE *cs= NULL; get_code_state_or_return FALSE; return (cs->stack != &init_settings); } /* * FUNCTION * * _db_set_init_ set initial debugger settings * * SYNOPSIS * * VOID _db_set_init_(control) * char *control; * * DESCRIPTION * see _db_set_ * */ void _db_set_init_(const char *control) { CODE_STATE tmp_cs; bzero((uchar*) &tmp_cs, sizeof(tmp_cs)); tmp_cs.stack= &init_settings; tmp_cs.process= db_process ? db_process : "dbug"; DbugParse(&tmp_cs, control); } /* * FUNCTION * * _db_pop_ pop the debug stack * * DESCRIPTION * * Pops the debug stack, returning the debug settings to its * condition prior to the most recent _db_push_ invocation. * Note that the pop will fail if it would remove the last * valid settings from the stack. This prevents user errors * in the push/pop sequence from screwing up the debugger. * Maybe there should be some kind of warning printed if the * user tries to pop too many states. * */ void _db_pop_() { uint old_fflags; CODE_STATE *cs; get_code_state_or_return; if (cs->stack != &init_settings) { old_fflags=fflags(cs); FreeState(cs, 1); FixTraceFlags(old_fflags, cs); } } /* * FUNCTION * * _db_explain_ generates 'control' string for the current settings * * RETURN * 0 - ok * 1 - buffer too short, output truncated * */ /* helper macros */ #define char_to_buf(C) do { \ *buf++=(C); \ if (buf >= end) goto overflow; \ } while (0) #define str_to_buf(S) do { \ char_to_buf(','); \ buf=strnmov(buf, (S), (uint) (end-buf)); \ if (buf >= end) goto overflow; \ } while (0) #define list_to_buf(l, f) do { \ struct link *listp=(l); \ while (listp) \ { \ if (listp->flags & (f)) \ { \ str_to_buf(listp->str); \ if (listp->flags & SUBDIR) \ char_to_buf('/'); \ } \ listp=listp->next_link; \ } \ } while (0) #define int_to_buf(i) do { \ char b[50]; \ int10_to_str((i), b, 10); \ str_to_buf(b); \ } while (0) #define colon_to_buf do { \ if (buf != start) char_to_buf(':'); \ } while(0) #define op_int_to_buf(C, val, def) do { \ if ((val) != (def)) \ { \ colon_to_buf; \ char_to_buf((C)); \ int_to_buf(val); \ } \ } while (0) #define op_intf_to_buf(C, val, def, cond) do { \ if ((cond)) \ { \ colon_to_buf; \ char_to_buf((C)); \ if ((val) != (def)) int_to_buf(val); \ } \ } while (0) #define op_str_to_buf(C, val, cond) do { \ if ((cond)) \ { \ char *s=(val); \ colon_to_buf; \ char_to_buf((C)); \ if (*s) str_to_buf(s); \ } \ } while (0) #define op_list_to_buf(C, val, cond) do { \ if ((cond)) \ { \ int f=ListFlags(val); \ colon_to_buf; \ char_to_buf((C)); \ if (f & INCLUDE) \ list_to_buf(val, INCLUDE); \ if (f & EXCLUDE) \ { \ colon_to_buf; \ char_to_buf('-'); \ char_to_buf((C)); \ list_to_buf(val, EXCLUDE); \ } \ } \ } while (0) #define op_bool_to_buf(C, cond) do { \ if ((cond)) \ { \ colon_to_buf; \ char_to_buf((C)); \ } \ } while (0) int _db_explain_ (CODE_STATE *cs, char *buf, size_t len) { char *start=buf, *end=buf+len-4; get_code_state_if_not_set_or_return *buf=0; op_list_to_buf('d', cs->stack->keywords, DEBUGGING); op_int_to_buf ('D', cs->stack->delay, 0); op_list_to_buf('f', cs->stack->functions, cs->stack->functions); op_bool_to_buf('F', cs->stack->flags & FILE_ON); op_bool_to_buf('i', cs->stack->flags & PID_ON); op_bool_to_buf('L', cs->stack->flags & LINE_ON); op_bool_to_buf('n', cs->stack->flags & DEPTH_ON); op_bool_to_buf('N', cs->stack->flags & NUMBER_ON); op_str_to_buf( ((cs->stack->flags & FLUSH_ON_WRITE ? 0 : 32) | (cs->stack->flags & OPEN_APPEND ? 'A' : 'O')), cs->stack->name, cs->stack->out_file != sstderr); op_list_to_buf('p', cs->stack->processes, cs->stack->processes); op_bool_to_buf('P', cs->stack->flags & PROCESS_ON); op_bool_to_buf('r', cs->stack->sub_level != 0); op_intf_to_buf('t', cs->stack->maxdepth, MAXDEPTH, TRACING); op_bool_to_buf('T', cs->stack->flags & TIMESTAMP_ON); op_bool_to_buf('S', cs->stack->flags & SANITY_CHECK_ON); *buf= '\0'; return 0; overflow: *end++= '.'; *end++= '.'; *end++= '.'; *end= '\0'; return 1; } #undef char_to_buf #undef str_to_buf #undef list_to_buf #undef int_to_buf #undef colon_to_buf #undef op_int_to_buf #undef op_intf_to_buf #undef op_str_to_buf #undef op_list_to_buf #undef op_bool_to_buf /* * FUNCTION * * _db_explain_init_ explain initial debugger settings * * DESCRIPTION * see _db_explain_ */ int _db_explain_init_(char *buf, size_t len) { CODE_STATE cs; bzero((uchar*) &cs,sizeof(cs)); cs.stack=&init_settings; return _db_explain_(&cs, buf, len); } /* * FUNCTION * * _db_enter_ process entry point to user function * * SYNOPSIS * * VOID _db_enter_(_func_, _file_, _line_, _stack_frame_) * char *_func_; points to current function name * char *_file_; points to current file name * int _line_; called from source line number * struct _db_stack_frame_ allocated on the caller's stack * * DESCRIPTION * * Called at the beginning of each user function to tell * the debugger that a new function has been entered. * Note that the pointers to the previous user function * name and previous user file name are stored on the * caller's stack (this is why the ENTER macro must be * the first "executable" code in a function, since it * allocates these storage locations). The previous nesting * level is also stored on the callers stack for internal * self consistency checks. * * Also prints a trace line if tracing is enabled and * increments the current function nesting depth. * * Note that this mechanism allows the debugger to know * what the current user function is at all times, without * maintaining an internal stack for the function names. * */ void _db_enter_(const char *_func_, const char *_file_, uint _line_, struct _db_stack_frame_ *_stack_frame_) { int save_errno; CODE_STATE *cs; if (!((cs=code_state()))) { _stack_frame_->level= 0; /* Set to avoid valgrind warnings if dbug is enabled later */ _stack_frame_->prev= 0; return; } save_errno= errno; _stack_frame_->func= cs->func; _stack_frame_->file= cs->file; cs->func= _func_; cs->file= _file_; _stack_frame_->prev= cs->framep; _stack_frame_->level= ++cs->level | framep_trace_flag(cs, cs->framep); cs->framep= _stack_frame_; switch (DoTrace(cs)) { case ENABLE_TRACE: cs->framep->level|= TRACE_ON; if (!TRACING) break; /* fall through */ case DO_TRACE: if ((cs->stack->flags & SANITY_CHECK_ON) && sf_sanity()) cs->stack->flags &= ~SANITY_CHECK_ON; if (TRACING) { if (!cs->locked) pthread_mutex_lock(&THR_LOCK_dbug); DoPrefix(cs, _line_); Indent(cs, cs->level); (void) fprintf(cs->stack->out_file->file, ">%s\n", cs->func); DbugFlush(cs); /* This does a unlock */ } break; case DISABLE_TRACE: cs->framep->level&= ~TRACE_ON; /* fall through */ case DONT_TRACE: break; } errno=save_errno; } /* * FUNCTION * * _db_return_ process exit from user function * * SYNOPSIS * * VOID _db_return_(_line_, _stack_frame_) * int _line_; current source line number * struct _db_stack_frame_ allocated on the caller's stack * * DESCRIPTION * * Called just before user function executes an explicit or implicit * return. Prints a trace line if trace is enabled, decrements * the current nesting level, and restores the current function and * file names from the defunct function's stack. * */ void _db_return_(uint _line_, struct _db_stack_frame_ *_stack_frame_) { int save_errno=errno; uint _slevel_= _stack_frame_->level & ~TRACE_ON; CODE_STATE *cs; get_code_state_or_return; if (cs->framep != _stack_frame_) { char buf[512]; my_snprintf(buf, sizeof(buf), ERR_MISSING_RETURN, cs->func); DbugExit(buf); } if (DoTrace(cs) & DO_TRACE) { if ((cs->stack->flags & SANITY_CHECK_ON) && sf_sanity()) cs->stack->flags &= ~SANITY_CHECK_ON; if (TRACING) { if (!cs->locked) pthread_mutex_lock(&THR_LOCK_dbug); DoPrefix(cs, _line_); Indent(cs, cs->level); (void) fprintf(cs->stack->out_file->file, "<%s\n", cs->func); DbugFlush(cs); } } /* Check to not set level < 0. This can happen if DBUG was disabled when function was entered and enabled in function. */ cs->level= _slevel_ != 0 ? _slevel_ - 1 : 0; cs->func= _stack_frame_->func; cs->file= _stack_frame_->file; if (cs->framep != NULL) cs->framep= cs->framep->prev; errno=save_errno; } /* * FUNCTION * * _db_pargs_ log arguments for subsequent use by _db_doprnt_() * * SYNOPSIS * * VOID _db_pargs_(_line_, keyword) * int _line_; * char *keyword; * * DESCRIPTION * * The new universal printing macro DBUG_PRINT, which replaces * all forms of the DBUG_N macros, needs two calls to runtime * support routines. The first, this function, remembers arguments * that are used by the subsequent call to _db_doprnt_(). * */ void _db_pargs_(uint _line_, const char *keyword) { CODE_STATE *cs; get_code_state_or_return; cs->u_line= _line_; cs->u_keyword= keyword; } /* * FUNCTION * * _db_doprnt_ handle print of debug lines * * SYNOPSIS * * VOID _db_doprnt_(format, va_alist) * char *format; * va_dcl; * * DESCRIPTION * * When invoked via one of the DBUG macros, tests the current keyword * set by calling _db_pargs_() to see if that macro has been selected * for processing via the debugger control string, and if so, handles * printing of the arguments via the format string. The line number * of the DBUG macro in the source is found in u_line. * * Note that the format string SHOULD NOT include a terminating * newline, this is supplied automatically. * */ #include void _db_doprnt_(const char *format,...) { va_list args; CODE_STATE *cs; get_code_state_or_return; va_start(args,format); if (!cs->locked) pthread_mutex_lock(&THR_LOCK_dbug); if (_db_keyword_(cs, cs->u_keyword, 0)) { int save_errno=errno; DoPrefix(cs, cs->u_line); if (TRACING) Indent(cs, cs->level + 1); else (void) fprintf(cs->stack->out_file->file, "%s: ", cs->func); (void) fprintf(cs->stack->out_file->file, "%s: ", cs->u_keyword); DbugVfprintf(cs->stack->out_file->file, format, args); DbugFlush(cs); errno=save_errno; } else if (!cs->locked) pthread_mutex_unlock(&THR_LOCK_dbug); va_end(args); } /* * This function is intended as a * vfprintf clone with consistent, platform independent output for * problematic formats like %p, %zd and %lld. */ static void DbugVfprintf(FILE *stream, const char* format, va_list args) { char cvtbuf[1024]; (void) my_vsnprintf(cvtbuf, sizeof(cvtbuf), format, args); (void) fprintf(stream, "%s\n", cvtbuf); } /* * FUNCTION * * _db_dump_ dump a string in hex * * SYNOPSIS * * void _db_dump_(_line_,keyword,memory,length) * int _line_; current source line number * char *keyword; * char *memory; Memory to print * int length; Bytes to print * * DESCRIPTION * Dump N characters in a binary array. * Is used to examine corrupted memory or arrays. */ void _db_dump_(uint _line_, const char *keyword, const unsigned char *memory, size_t length) { int pos; CODE_STATE *cs; get_code_state_or_return; if (!cs->locked) pthread_mutex_lock(&THR_LOCK_dbug); if (_db_keyword_(cs, keyword, 0)) { DoPrefix(cs, _line_); if (TRACING) { Indent(cs, cs->level + 1); pos= min(max(cs->level-cs->stack->sub_level,0)*INDENT,80); } else { fprintf(cs->stack->out_file->file, "%s: ", cs->func); } (void) fprintf(cs->stack->out_file->file, "%s: Memory: 0x%lx Bytes: (%ld)\n", keyword, (ulong) memory, (long) length); pos=0; while (length-- > 0) { uint tmp= *((unsigned char*) memory++); if ((pos+=3) >= 80) { fputc('\n',cs->stack->out_file->file); pos=3; } fputc(_dig_vec_upper[((tmp >> 4) & 15)], cs->stack->out_file->file); fputc(_dig_vec_upper[tmp & 15], cs->stack->out_file->file); fputc(' ',cs->stack->out_file->file); } (void) fputc('\n',cs->stack->out_file->file); DbugFlush(cs); } else if (!cs->locked) pthread_mutex_unlock(&THR_LOCK_dbug); } /* * FUNCTION * * ListAddDel modify the list according to debug control string * * DESCRIPTION * * Given pointer to a comma separated list of strings in "cltp", * parses the list, and modifies "listp", returning a pointer * to the new list. * * The mode of operation is defined by "todo" parameter. * * If it is INCLUDE, elements (strings from "cltp") are added to the * list, they will have INCLUDE flag set. If the list already contains * the string in question, new element is not added, but a flag of * the existing element is adjusted (INCLUDE bit is set, EXCLUDE bit * is removed). * * If it is EXCLUDE, elements are added to the list with the EXCLUDE * flag set. If the list already contains the string in question, * it is removed, new element is not added. */ static struct link *ListAddDel(struct link *head, const char *ctlp, const char *end, int todo) { const char *start; struct link **cur; size_t len; int subdir; ctlp--; next: while (++ctlp < end) { start= ctlp; subdir=0; while (ctlp < end && *ctlp != ',') ctlp++; len= (int) (ctlp-start); if (start[len-1] == '/') { len--; subdir=SUBDIR; } if (len == 0) continue; for (cur=&head; *cur; cur=&((*cur)->next_link)) { if (!strncmp((*cur)->str, start, len)) { if ((*cur)->flags & todo) /* same action ? */ (*cur)->flags|= subdir; /* just merge the SUBDIR flag */ else if (todo == EXCLUDE) { struct link *delme=*cur; *cur=(*cur)->next_link; free((void*) delme); } else { (*cur)->flags&=~(EXCLUDE & SUBDIR); (*cur)->flags|=INCLUDE | subdir; } goto next; } } *cur= (struct link *) DbugMalloc(sizeof(struct link)+len); memcpy((*cur)->str, start, len); (*cur)->str[len]=0; (*cur)->flags=todo | subdir; (*cur)->next_link=0; } return head; } /* * FUNCTION * * ListCopy make a copy of the list * * SYNOPSIS * * static struct link *ListCopy(orig) * struct link *orig; * * DESCRIPTION * * Given pointer to list, which contains a copy of every element from * the original list. * * the orig pointer can be NULL * * Note that since each link is added at the head of the list, * the final list will be in "reverse order", which is not * significant for our usage here. * */ static struct link *ListCopy(struct link *orig) { struct link *new_malloc; struct link *head; size_t len; head= NULL; while (orig != NULL) { len= strlen(orig->str); new_malloc= (struct link *) DbugMalloc(sizeof(struct link)+len); memcpy(new_malloc->str, orig->str, len); new_malloc->str[len]= 0; new_malloc->flags=orig->flags; new_malloc->next_link= head; head= new_malloc; orig= orig->next_link; } return head; } /* * FUNCTION * * InList test a given string for member of a given list * * DESCRIPTION * * Tests the string pointed to by "cp" to determine if it is in * the list pointed to by "linkp". Linkp points to the first * link in the list. If linkp is NULL or contains only EXCLUDE * elements then the string is treated as if it is in the list. * This may seem rather strange at first but leads to the desired * operation if no list is given. The net effect is that all * strings will be accepted when there is no list, and when there * is a list, only those strings in the list will be accepted. * * RETURN * combination of SUBDIR, INCLUDE, EXCLUDE, MATCHED flags * */ static int InList(struct link *linkp, const char *cp, int exact_match) { int result; for (result=MATCHED; linkp != NULL; linkp= linkp->next_link) { if (!(exact_match ? strcmp(linkp->str,cp) : fnmatch(linkp->str, cp, 0))) return linkp->flags; if (!(linkp->flags & EXCLUDE)) result=NOT_MATCHED; if (linkp->flags & SUBDIR) result|=SUBDIR; } return result; } /* * FUNCTION * * ListFlags returns aggregated list flags (ORed over all elements) * */ static uint ListFlags(struct link *linkp) { uint f; for (f=0; linkp != NULL; linkp= linkp->next_link) f|= linkp->flags; return f; } /* * FUNCTION * * PushState push current settings onto stack and set up new one * * SYNOPSIS * * static VOID PushState() * * DESCRIPTION * * Pushes the current settings on the settings stack, and creates * a new settings. The new settings is NOT initialized * * The settings stack is a linked list of settings, with the new * settings added at the head. This allows the stack to grow * to the limits of memory if necessary. * */ static void PushState(CODE_STATE *cs) { struct settings *new_malloc; new_malloc= (struct settings *) DbugMalloc(sizeof(struct settings)); bzero(new_malloc, sizeof(*new_malloc)); new_malloc->next= cs->stack; cs->stack= new_malloc; } /* * FUNCTION * * FreeState Free memory associated with a struct state. * * SYNOPSIS * * static void FreeState (state) * struct state *state; * int free_state; * * DESCRIPTION * * Deallocates the memory allocated for various information in a * state. If free_state is set, also free 'state' * */ static void FreeState(CODE_STATE *cs, int free_state) { struct settings *state= cs->stack; if (!is_shared(state, keywords)) FreeList(state->keywords); if (!is_shared(state, functions)) FreeList(state->functions); if (!is_shared(state, processes)) FreeList(state->processes); DBUGCloseFile(cs, NULL); if (free_state) { struct settings *next= state->next; free(state); cs->stack= next; } } /* * FUNCTION * * _db_end_ End debugging, freeing state stack memory. * * SYNOPSIS * * static VOID _db_end_ () * * DESCRIPTION * * Ends debugging, de-allocating the memory allocated to the * state stack. * * To be called at the very end of the program. * */ void _db_end_() { CODE_STATE *cs, dummy_cs; /* Set _dbug_on_ to be able to do full reset even when DEBUGGER_OFF was called after dbug was initialized */ _dbug_on_= 1; cs= code_state(); if (cs) { while (cs->stack && cs->stack != &init_settings) FreeState(cs, 1); } else { cs= &dummy_cs; bzero(cs, sizeof(*cs)); } cs->stack= &init_settings; FreeState(cs, 0); pthread_mutex_destroy(&THR_LOCK_dbug); init_done= 0; } /* * FUNCTION * * DoTrace check to see if tracing is current enabled * * DESCRIPTION * * Checks to see if dbug in this function is enabled based on * whether the maximum trace depth has been reached, the current * function is selected, and the current process is selected. * */ static int DoTrace(CODE_STATE *cs) { if ((cs->stack->maxdepth == 0 || cs->level <= cs->stack->maxdepth) && InList(cs->stack->processes, cs->process, 0) & (MATCHED|INCLUDE)) switch(InList(cs->stack->functions, cs->func, 0)) { case INCLUDE|SUBDIR: return ENABLE_TRACE; case INCLUDE: return DO_TRACE; case MATCHED|SUBDIR: case NOT_MATCHED|SUBDIR: case MATCHED: return framep_trace_flag(cs, cs->framep) ? DO_TRACE : DONT_TRACE; case EXCLUDE: case NOT_MATCHED: return DONT_TRACE; case EXCLUDE|SUBDIR: return DISABLE_TRACE; } return DONT_TRACE; } FILE *_db_fp_(void) { CODE_STATE *cs; get_code_state_or_return NULL; return cs->stack->out_file->file; } /* * FUNCTION * * _db_keyword_ test keyword for member of keyword list * * DESCRIPTION * * Test a keyword to determine if it is in the currently active * keyword list. If strict=0, a keyword is accepted * if the list is null, otherwise it must match one of the list * members. When debugging is not on, no keywords are accepted. * After the maximum trace level is exceeded, no keywords are * accepted (this behavior subject to change). Additionally, * the current function and process must be accepted based on * their respective lists. * * Returns TRUE if keyword accepted, FALSE otherwise. * */ BOOLEAN _db_keyword_(CODE_STATE *cs, const char *keyword, int strict) { int match= strict ? INCLUDE : INCLUDE|MATCHED; get_code_state_if_not_set_or_return FALSE; return (DEBUGGING && DoTrace(cs) & DO_TRACE && InList(cs->stack->keywords, keyword, strict) & match); } /* * FUNCTION * * Indent indent a line to the given indentation level * * SYNOPSIS * * static VOID Indent(indent) * int indent; * * DESCRIPTION * * Indent a line to the given level. Note that this is * a simple minded but portable implementation. * There are better ways. * * Also, the indent must be scaled by the compile time option * of character positions per nesting level. * */ static void Indent(CODE_STATE *cs, int indent) { int count; indent= max(indent-1-cs->stack->sub_level,0)*INDENT; for (count= 0; count < indent ; count++) { if ((count % INDENT) == 0) fputc('|',cs->stack->out_file->file); else fputc(' ',cs->stack->out_file->file); } } /* * FUNCTION * * FreeList free all memory associated with a linked list * * SYNOPSIS * * static VOID FreeList(linkp) * struct link *linkp; * * DESCRIPTION * * Given pointer to the head of a linked list, frees all * memory held by the list and the members of the list. * */ static void FreeList(struct link *linkp) { struct link *old; while (linkp != NULL) { old= linkp; linkp= linkp->next_link; free((void*) old); } } /* * FUNCTION * * DoPrefix print debugger line prefix prior to indentation * * SYNOPSIS * * static VOID DoPrefix(_line_) * int _line_; * * DESCRIPTION * * Print prefix common to all debugger output lines, prior to * doing indentation if necessary. Print such information as * current process name, current source file name and line number, * and current function nesting depth. * */ static void DoPrefix(CODE_STATE *cs, uint _line_) { cs->lineno++; if (cs->stack->flags & PID_ON) { (void) fprintf(cs->stack->out_file->file, "%-7s: ", my_thread_name()); } if (cs->stack->flags & NUMBER_ON) (void) fprintf(cs->stack->out_file->file, "%5d: ", cs->lineno); if (cs->stack->flags & TIMESTAMP_ON) { #ifdef __WIN__ /* FIXME This doesn't give microseconds as in Unix case, and the resolution is in system ticks, 10 ms intervals. See my_getsystime.c for high res */ SYSTEMTIME loc_t; GetLocalTime(&loc_t); (void) fprintf (cs->stack->out_file->file, /* "%04d-%02d-%02d " */ "%02d:%02d:%02d.%06d ", /*tm_p->tm_year + 1900, tm_p->tm_mon + 1, tm_p->tm_mday,*/ loc_t.wHour, loc_t.wMinute, loc_t.wSecond, loc_t.wMilliseconds); #else struct timeval tv; struct tm *tm_p; if (gettimeofday(&tv, NULL) != -1) { if ((tm_p= localtime((const time_t *)&tv.tv_sec))) { (void) fprintf (cs->stack->out_file->file, /* "%04d-%02d-%02d " */ "%02d:%02d:%02d.%06d ", /*tm_p->tm_year + 1900, tm_p->tm_mon + 1, tm_p->tm_mday,*/ tm_p->tm_hour, tm_p->tm_min, tm_p->tm_sec, (int) (tv.tv_usec)); } } #endif } if (cs->stack->flags & PROCESS_ON) (void) fprintf(cs->stack->out_file->file, "%s: ", cs->process); if (cs->stack->flags & FILE_ON) (void) fprintf(cs->stack->out_file->file, "%14s: ", BaseName(cs->file)); if (cs->stack->flags & LINE_ON) (void) fprintf(cs->stack->out_file->file, "%5d: ", _line_); if (cs->stack->flags & DEPTH_ON) (void) fprintf(cs->stack->out_file->file, "%4d: ", cs->level); } /* * FUNCTION * * DBUGOpenFile open new output stream for debugger output * * SYNOPSIS * * static VOID DBUGOpenFile(name) * char *name; * * DESCRIPTION * * Given name of a new file (or "-" for stdout) opens the file * and sets the output stream to the new file. * */ static void DBUGOpenFile(CODE_STATE *cs, const char *name,const char *end,int append) { FILE *fp; if (name != NULL) { if (end) { size_t len=end-name; memcpy(cs->stack->name, name, len); cs->stack->name[len]=0; } else strmov(cs->stack->name,name); name=cs->stack->name; if (strcmp(name, "-") == 0) { DBUGCloseFile(cs, sstdout); cs->stack->flags |= FLUSH_ON_WRITE; cs->stack->name[0]=0; } else { if (!Writable(name)) { (void) fprintf(stderr, ERR_OPEN, cs->process, name); perror(""); fflush(stderr); } else { if (!(fp= fopen(name, append ? "a+" : "w"))) { (void) fprintf(stderr, ERR_OPEN, cs->process, name); perror(""); fflush(stderr); } else { sFILE *sfp= (sFILE *)DbugMalloc(sizeof(sFILE)); sfp->file= fp; sfp->used= 1; DBUGCloseFile(cs, sfp); } } } } } /* * FUNCTION * * DBUGCloseFile close the debug output stream * * SYNOPSIS * * static VOID DBUGCloseFile(fp) * FILE *fp; * * DESCRIPTION * * Closes the debug output stream unless it is standard output * or standard error. * */ static void DBUGCloseFile(CODE_STATE *cs, sFILE *new_value) { sFILE *fp; if (!cs || !cs->stack || !cs->stack->out_file) return; if (!cs->locked) pthread_mutex_lock(&THR_LOCK_dbug); fp= cs->stack->out_file; if (--fp->used == 0) { if (fclose(fp->file) == EOF) { (void) fprintf(stderr, ERR_CLOSE, cs->process); perror(""); } else { free(fp); } } cs->stack->out_file= new_value; if (!cs->locked) pthread_mutex_unlock(&THR_LOCK_dbug); } /* * FUNCTION * * DbugExit print error message and exit * * SYNOPSIS * * static VOID DbugExit(why) * char *why; * * DESCRIPTION * * Prints error message using current process name, the reason for * aborting (typically out of memory), and exits with status 1. * This should probably be changed to use a status code * defined in the user's debugger include file. * */ static void DbugExit(const char *why) { CODE_STATE *cs=code_state(); (void) fprintf(stderr, ERR_ABORT, cs ? cs->process : "(null)", why); (void) fflush(stderr); DBUG_ABORT(); } /* * FUNCTION * * DbugMalloc allocate memory for debugger runtime support * * SYNOPSIS * * static long *DbugMalloc(size) * int size; * * DESCRIPTION * * Allocate more memory for debugger runtime support functions. * Failure to to allocate the requested number of bytes is * immediately fatal to the current process. This may be * rather unfriendly behavior. It might be better to simply * print a warning message, freeze the current debugger cs, * and continue execution. * */ static char *DbugMalloc(size_t size) { char *new_malloc; if (!(new_malloc= (char*) malloc(size))) DbugExit("out of memory"); return new_malloc; } /* * strtok lookalike - splits on ':', magically handles ::, :\ and :/ */ static const char *DbugStrTok(const char *s) { while (s[0] && (s[0] != ':' || (s[1] == '\\' || s[1] == '/' || (s[1] == ':' && s++)))) s++; return s; } /* * FUNCTION * * BaseName strip leading pathname components from name * * SYNOPSIS * * static char *BaseName(pathname) * char *pathname; * * DESCRIPTION * * Given pointer to a complete pathname, locates the base file * name at the end of the pathname and returns a pointer to * it. * */ static const char *BaseName(const char *pathname) { const char *base; base= strrchr(pathname, FN_LIBCHAR); if (base++ == NullS) base= pathname; return base; } /* * FUNCTION * * Writable test to see if a pathname is writable/creatable * * SYNOPSIS * * static BOOLEAN Writable(pathname) * char *pathname; * * DESCRIPTION * * Because the debugger might be linked in with a program that * runs with the set-uid-bit (suid) set, we have to be careful * about opening a user named file for debug output. This consists * of checking the file for write access with the real user id, * or checking the directory where the file will be created. * * Returns TRUE if the user would normally be allowed write or * create access to the named file. Returns FALSE otherwise. * */ #ifndef Writable static BOOLEAN Writable(const char *pathname) { BOOLEAN granted; char *lastslash; granted= FALSE; if (EXISTS(pathname)) { if (WRITABLE(pathname)) granted= TRUE; } else { lastslash= strrchr(pathname, '/'); if (lastslash != NULL) *lastslash= '\0'; else pathname= "."; if (WRITABLE(pathname)) granted= TRUE; if (lastslash != NULL) *lastslash= '/'; } return granted; } #endif /* flush dbug-stream, free mutex lock & wait delay This is because some systems (MSDOS!!) dosn't flush fileheader and dbug-file isn't readable after a system crash !! */ static void DbugFlush(CODE_STATE *cs) { if (cs->stack->flags & FLUSH_ON_WRITE) { (void) fflush(cs->stack->out_file->file); if (cs->stack->delay) (void) Delay(cs->stack->delay); } if (!cs->locked) pthread_mutex_unlock(&THR_LOCK_dbug); } /* DbugFlush */ /* For debugging */ void _db_flush_() { CODE_STATE *cs; get_code_state_or_return; (void) fflush(cs->stack->out_file->file); } #ifndef __WIN__ void _db_suicide_() { int retval; sigset_t new_mask; sigfillset(&new_mask); fprintf(stderr, "SIGKILL myself\n"); fflush(stderr); retval= kill(getpid(), SIGKILL); assert(retval == 0); retval= sigsuspend(&new_mask); fprintf(stderr, "sigsuspend returned %d errno %d \n", retval, errno); assert(FALSE); /* With full signal mask, we should never return here. */ } #endif /* ! __WIN__ */ void _db_lock_file_() { CODE_STATE *cs; get_code_state_or_return; pthread_mutex_lock(&THR_LOCK_dbug); cs->locked=1; } void _db_unlock_file_() { CODE_STATE *cs; get_code_state_or_return; cs->locked=0; pthread_mutex_unlock(&THR_LOCK_dbug); } const char* _db_get_func_(void) { CODE_STATE *cs; get_code_state_or_return NULL; return cs->func; } #else /* * Dummy function, workaround for build failure on a platform where linking * with an empty archive fails. */ int i_am_a_dummy_function() { return 0; } #endif /* DBUG_OFF */