diff options
| author | Zdenek Dohnal <zdohnal@redhat.com> | 2021-08-11 14:20:05 +0200 |
|---|---|---|
| committer | Bram Moolenaar <Bram@vim.org> | 2021-08-11 14:20:05 +0200 |
| commit | ba9c23e77655766f6c59de8be732b7577f795ed3 (patch) | |
| tree | e410325ec1f91c7c267fdcdbfa753cfaaaf57ce7 /src/os_unix.c | |
| parent | 6e48b84c5f08a7e192817aca0d8278ea2ff82bc7 (diff) | |
| download | vim-git-ba9c23e77655766f6c59de8be732b7577f795ed3.tar.gz | |
patch 8.2.3327: no check for sysconf() failingv8.2.3327
Problem: No check for sysconf() failing.
Solution: If sysconf() fails use SIGSTKSZ for the signal stack size.
(Zdenek Dohnal, closes #8743)
Diffstat (limited to 'src/os_unix.c')
| -rw-r--r-- | src/os_unix.c | 46 |
1 files changed, 27 insertions, 19 deletions
diff --git a/src/os_unix.c b/src/os_unix.c index 56ee764b0..b603927e3 100644 --- a/src/os_unix.c +++ b/src/os_unix.c @@ -783,16 +783,36 @@ mch_stackcheck(char *p) * completely full. */ -#if !defined SIGSTKSZ && !defined(HAVE_SYSCONF_SIGSTKSZ) -# define SIGSTKSZ 8000 // just a guess of how much stack is needed... -#endif - # ifdef HAVE_SIGALTSTACK static stack_t sigstk; // for sigaltstack() # else static struct sigstack sigstk; // for sigstack() # endif +/* + * Get a size of signal stack. + * Preference (if available): sysconf > SIGSTKSZ > guessed size + */ +static long int get_signal_stack_size() +{ +# ifdef HAVE_SYSCONF_SIGSTKSZ + long int size = -1; + + // return size only if sysconf doesn't return an error + if ((size = sysconf(_SC_SIGSTKSZ)) > -1) + return size; +# endif + +# ifdef SIGSTKSZ + // if sysconf() isn't available or gives error, return SIGSTKSZ + // if defined + return SIGSTKSZ; +# endif + + // otherwise guess the size + return 8000; +} + static char *signal_stack; static void @@ -806,21 +826,13 @@ init_signal_stack(void) # else sigstk.ss_sp = signal_stack; # endif -# ifdef HAVE_SYSCONF_SIGSTKSZ - sigstk.ss_size = sysconf(_SC_SIGSTKSZ); -# else - sigstk.ss_size = SIGSTKSZ; -# endif + sigstk.ss_size = get_signal_stack_size(); sigstk.ss_flags = 0; (void)sigaltstack(&sigstk, NULL); # else sigstk.ss_sp = signal_stack; if (stack_grows_downwards) -# ifdef HAVE_SYSCONF_SIGSTKSZ - sigstk.ss_sp += sysconf(_SC_SIGSTKSZ) - 1; -# else - sigstk.ss_sp += SIGSTKSZ - 1; -# endif + sigstk.ss_sp += get_signal_stack_size() - 1; sigstk.ss_onstack = 0; (void)sigstack(&sigstk, NULL); # endif @@ -3278,11 +3290,7 @@ mch_early_init(void) * Ignore any errors. */ #if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK) -# ifdef HAVE_SYSCONF_SIGSTKSZ - signal_stack = alloc(sysconf(_SC_SIGSTKSZ)); -# else - signal_stack = alloc(SIGSTKSZ); -# endif + signal_stack = alloc(get_signal_stack_size()); init_signal_stack(); #endif } |