/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

/* This file defines the logformat in an executable fashion.
 * This code is used to generate
 *   The code that writes into the log.
 *   The code that reads the log and prints it to stdout (the log_print utility)
 *   The code that reads the log for recovery.
 *   The struct definitions.
 *   The Latex documentation.
 */
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <toku_portability.h>
#include <toku_assert.h>


typedef struct field {
    const char *type;
    const char *name;
    const char *format; // optional format string
} F;

#define NULLFIELD {0,0,0}
#define FA (F[])

enum log_begin_action {
    IGNORE_LOG_BEGIN,
    SHOULD_LOG_BEGIN,
    ASSERT_BEGIN_WAS_LOGGED,
    LOG_BEGIN_ACTION_NA = IGNORE_LOG_BEGIN
};

struct logtype {
    const char *name;
    unsigned int command_and_flags;
    struct field *fields;
    enum log_begin_action log_begin_action;
};

// In the fields, don't mention the command, the LSN, the CRC or the trailing LEN.

const struct logtype rollbacks[] = {
    //TODO: #2037 Add dname
    {"fdelete", 'U', FA{{"FILENUM",    "filenum", 0},
                        NULLFIELD}, LOG_BEGIN_ACTION_NA},
    //TODO: #2037 Add dname
    {"fcreate", 'F', FA{{"FILENUM", "filenum", 0},
                        {"BYTESTRING", "iname", 0},
                        NULLFIELD}, LOG_BEGIN_ACTION_NA},
    //rename file
    {"frename", 'n', FA{{"BYTESTRING",    "old_iname", 0},
                        {"BYTESTRING",    "new_iname", 0},
                        NULLFIELD}, LOG_BEGIN_ACTION_NA},
    // cmdinsert is used to insert a key-value pair into a DB.  For rollback we don't need the data.
    {"cmdinsert", 'i', FA{
                          {"FILENUM", "filenum", 0},
                          {"BYTESTRING", "key", 0},
                          NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"cmddelete", 'd', FA{
                          {"FILENUM", "filenum", 0},
                          {"BYTESTRING", "key", 0},
                          NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"rollinclude", 'r', FA{{"TXNID_PAIR",     "xid", 0},
                            {"uint64_t", "num_nodes", 0},
                            {"BLOCKNUM",  "spilled_head", 0},
                            {"BLOCKNUM",  "spilled_tail", 0},
                            NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"load", 'l', FA{{"FILENUM",    "old_filenum", 0},
                     {"BYTESTRING", "new_iname", 0},
                     NULLFIELD}, LOG_BEGIN_ACTION_NA},
    // #2954
    {"hot_index", 'h', FA{{"FILENUMS",  "hot_index_filenums", 0},
                          NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"dictionary_redirect", 'R', FA{{"FILENUM", "old_filenum", 0},
                                    {"FILENUM", "new_filenum", 0},
                                    NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"cmdupdate", 'u', FA{{"FILENUM", "filenum", 0},
                          {"BYTESTRING", "key", 0},
                          NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"cmdupdatebroadcast", 'B', FA{{"FILENUM", "filenum", 0},
                                   {"bool",    "is_resetting_op", 0},
                                   NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {"change_fdescriptor", 'D', FA{{"FILENUM",    "filenum", 0},
                            {"BYTESTRING", "old_descriptor", 0},
                            NULLFIELD}, LOG_BEGIN_ACTION_NA},
    {0,0,FA{NULLFIELD}, LOG_BEGIN_ACTION_NA}
};

const struct logtype logtypes[] = {
    // Records produced by checkpoints
#if 0 // no longer used, but reserve the type
    {"local_txn_checkpoint", 'c', FA{{"TXNID",      "xid", 0}, NULLFIELD}},
#endif
    {"begin_checkpoint", 'x', FA{{"uint64_t", "timestamp", 0}, {"TXNID", "last_xid", 0}, NULLFIELD}, IGNORE_LOG_BEGIN},
    {"end_checkpoint",   'X', FA{{"LSN", "lsn_begin_checkpoint", 0},
                                 {"uint64_t", "timestamp", 0},
                                 {"uint32_t", "num_fassociate_entries", 0}, // how many files were checkpointed
                                 {"uint32_t", "num_xstillopen_entries", 0},  // how many txns  were checkpointed
                                 NULLFIELD}, IGNORE_LOG_BEGIN},
    //TODO: #2037 Add dname
    {"fassociate",  'f', FA{{"FILENUM", "filenum", 0},
                            {"uint32_t",  "treeflags", 0},
                            {"BYTESTRING", "iname", 0},   // pathname of file
                            {"uint8_t", "unlink_on_close", 0},
                            NULLFIELD}, IGNORE_LOG_BEGIN},
    //We do not use a txninfo struct since recovery log has
    //FILENUMS and TOKUTXN has FTs (for open_fts)
    {"xstillopen", 's', FA{{"TXNID_PAIR", "xid", 0}, 
                           {"TXNID_PAIR", "parentxid", 0}, 
                           {"uint64_t", "rollentry_raw_count", 0}, 
                           {"FILENUMS",  "open_filenums", 0},
                           {"uint8_t",  "force_fsync_on_commit", 0}, 
                           {"uint64_t", "num_rollback_nodes", 0}, 
                           {"uint64_t", "num_rollentries", 0}, 
                           {"BLOCKNUM",  "spilled_rollback_head", 0}, 
                           {"BLOCKNUM",  "spilled_rollback_tail", 0}, 
                           {"BLOCKNUM",  "current_rollback", 0}, 
                           NULLFIELD}, ASSERT_BEGIN_WAS_LOGGED}, // record all transactions
    // prepared txns need a gid
    {"xstillopenprepared", 'p', FA{{"TXNID_PAIR", "xid", 0},
                                   {"XIDP",  "xa_xid", 0}, // prepared transactions need a gid, and have no parentxid.
                                   {"uint64_t", "rollentry_raw_count", 0}, 
                                   {"FILENUMS",  "open_filenums", 0},
                                   {"uint8_t",  "force_fsync_on_commit", 0}, 
                                   {"uint64_t", "num_rollback_nodes", 0},
                                   {"uint64_t", "num_rollentries", 0},
                                   {"BLOCKNUM",  "spilled_rollback_head", 0},
                                   {"BLOCKNUM",  "spilled_rollback_tail", 0},
                                   {"BLOCKNUM",  "current_rollback", 0},
                                   NULLFIELD}, ASSERT_BEGIN_WAS_LOGGED}, // record all transactions
    // Records produced by transactions
    {"xbegin", 'b', FA{{"TXNID_PAIR", "xid", 0},{"TXNID_PAIR", "parentxid", 0},NULLFIELD}, IGNORE_LOG_BEGIN},
    {"xcommit",'C', FA{{"TXNID_PAIR", "xid", 0},NULLFIELD}, ASSERT_BEGIN_WAS_LOGGED},
    {"xprepare",'P', FA{{"TXNID_PAIR", "xid", 0}, {"XIDP", "xa_xid", 0}, NULLFIELD}, ASSERT_BEGIN_WAS_LOGGED},
    {"xabort", 'q', FA{{"TXNID_PAIR", "xid", 0},NULLFIELD}, ASSERT_BEGIN_WAS_LOGGED},
    //TODO: #2037 Add dname
    {"fcreate", 'F', FA{{"TXNID_PAIR",      "xid", 0},
                        {"FILENUM",    "filenum", 0},
                        {"BYTESTRING", "iname", 0},
                        {"uint32_t",  "mode",  "0%o"},
                        {"uint32_t",  "treeflags", 0},
                        {"uint32_t", "nodesize", 0},
                        {"uint32_t", "basementnodesize", 0},
                        {"uint32_t", "compression_method", 0},
                        NULLFIELD}, SHOULD_LOG_BEGIN},
    //TODO: #2037 Add dname
    {"fopen",   'O', FA{{"BYTESTRING", "iname", 0},
                        {"FILENUM",    "filenum", 0},
                        {"uint32_t",  "treeflags", 0},
                        NULLFIELD}, IGNORE_LOG_BEGIN},
    //TODO: #2037 Add dname
    {"fclose",   'e', FA{{"BYTESTRING", "iname", 0},
                         {"FILENUM",    "filenum", 0},
                         NULLFIELD}, IGNORE_LOG_BEGIN},
    //TODO: #2037 Add dname
    {"fdelete", 'U', FA{{"TXNID_PAIR",      "xid", 0},
                        {"FILENUM", "filenum", 0},
                        NULLFIELD}, SHOULD_LOG_BEGIN},
    {"frename", 'n', FA{{"TXNID_PAIR",      "xid", 0},
                        {"BYTESTRING",    "old_iname", 0},
                        {"FILENUM",       "old_filenum",   0},
                        {"BYTESTRING",    "new_iname", 0},
                        NULLFIELD}, IGNORE_LOG_BEGIN},
    {"enq_insert", 'I', FA{{"FILENUM",    "filenum", 0},
                           {"TXNID_PAIR",      "xid", 0},
                           {"BYTESTRING", "key", 0},
                           {"BYTESTRING", "value", 0},
                           NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_insert_no_overwrite", 'i', FA{{"FILENUM",    "filenum", 0},
                                        {"TXNID_PAIR",      "xid", 0},
                                        {"BYTESTRING", "key", 0},
                                        {"BYTESTRING", "value", 0},
                                        NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_delete_any", 'E', FA{{"FILENUM",    "filenum", 0},
                               {"TXNID_PAIR",      "xid", 0},
                               {"BYTESTRING", "key", 0},
                               NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_insert_multiple", 'm', FA{{"FILENUM",    "src_filenum", 0},
                                    {"FILENUMS",   "dest_filenums", 0},
                                    {"TXNID_PAIR",      "xid", 0},
                                    {"BYTESTRING", "src_key", 0},
                                    {"BYTESTRING", "src_val", 0},
                                    NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_delete_multiple", 'M', FA{{"FILENUM",    "src_filenum", 0},
                                    {"FILENUMS",   "dest_filenums", 0},
                                    {"TXNID_PAIR",      "xid", 0},
                                    {"BYTESTRING", "src_key", 0},
                                    {"BYTESTRING", "src_val", 0},
                                    NULLFIELD}, SHOULD_LOG_BEGIN},
    {"comment", 'T', FA{{"uint64_t", "timestamp", 0},
                        {"BYTESTRING", "comment", 0},
                        NULLFIELD}, IGNORE_LOG_BEGIN},
    // Note: shutdown_up_to_19 log entry is NOT ALLOWED TO BE CHANGED.
    // Do not change the letter ('Q'), do not add fields,
    // do not remove fields.
    // TODO: Kill this logentry entirely once we no longer support version 19.
    {"shutdown_up_to_19", 'Q', FA{{"uint64_t", "timestamp", 0},
                         NULLFIELD}, IGNORE_LOG_BEGIN},
    // Note: Shutdown log entry is NOT ALLOWED TO BE CHANGED.
    // Do not change the letter ('0'), do not add fields,
    // do not remove fields.
    // You CAN leave this alone and add a new one, but then you have
    // to deal with the upgrade mechanism again.
    // This is how we detect clean shutdowns from OLDER VERSIONS.
    // This log entry must always be readable for future versions.
    // If you DO change it, you need to write a separate log upgrade mechanism.
    {"shutdown", '0', FA{{"uint64_t", "timestamp", 0},
                         {"TXNID", "last_xid", 0},
                         NULLFIELD}, IGNORE_LOG_BEGIN},
    {"load", 'l', FA{{"TXNID_PAIR",      "xid", 0},
                     {"FILENUM",    "old_filenum", 0},
                     {"BYTESTRING", "new_iname", 0},
                     NULLFIELD}, SHOULD_LOG_BEGIN},
    // #2954
    {"hot_index", 'h', FA{{"TXNID_PAIR",     "xid", 0},
                          {"FILENUMS",  "hot_index_filenums", 0},
                          NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_update", 'u', FA{{"FILENUM",    "filenum", 0},
                           {"TXNID_PAIR",      "xid", 0},
                           {"BYTESTRING", "key", 0},
                           {"BYTESTRING", "extra", 0},
                           NULLFIELD}, SHOULD_LOG_BEGIN},
    {"enq_updatebroadcast", 'B', FA{{"FILENUM",    "filenum", 0},
                                    {"TXNID_PAIR",      "xid", 0},
                                    {"BYTESTRING", "extra", 0},
                                    {"bool",       "is_resetting_op", 0},
                                    NULLFIELD}, SHOULD_LOG_BEGIN},
    {"change_fdescriptor", 'D', FA{{"FILENUM",    "filenum", 0},
                            {"TXNID_PAIR",      "xid", 0},
                            {"BYTESTRING", "old_descriptor", 0},
                            {"BYTESTRING", "new_descriptor", 0},
                            {"bool",       "update_cmp_descriptor", 0},
                            NULLFIELD}, SHOULD_LOG_BEGIN},
    {0,0,FA{NULLFIELD}, (enum log_begin_action) 0}
};


#define DO_STRUCTS(lt, array, body) do {        \
    const struct logtype *lt;    \
    for (lt=&array[0]; lt->name; lt++) {        \
        body; \
    } } while (0)

#define DO_ROLLBACKS(lt, body) DO_STRUCTS(lt, rollbacks, body)

#define DO_LOGTYPES(lt, body) DO_STRUCTS(lt, logtypes, body)

#define DO_LOGTYPES_AND_ROLLBACKS(lt, body) (DO_ROLLBACKS(lt,body), DO_LOGTYPES(lt, body))

#define DO_FIELDS(fld, lt, body) do { \
    struct field *fld; \
    for (fld=lt->fields; fld->type; fld++) { \
        body; \
    } } while (0)


static void __attribute__((format (printf, 3, 4))) fprintf2 (FILE *f1, FILE *f2, const char *format, ...) {
    va_list ap;
    int r;
    va_start(ap, format);
    r=vfprintf(f1, format, ap); assert(r>=0);
    va_end(ap);
    va_start(ap, format);
    r=vfprintf(f2, format, ap); assert(r>=0);
    va_end(ap);
}

FILE *hf=0, *cf=0, *pf=0;

static void
generate_enum_internal (const char *enum_name, const char *enum_prefix, const struct logtype *lts) {
    char used_cmds[256];
    int count=0;
    memset(used_cmds, 0, 256);
    fprintf(hf, "enum %s {", enum_name);
    DO_STRUCTS(lt, lts,
                {
                    unsigned char cmd = (unsigned char)(lt->command_and_flags&0xff);
                    if (count!=0) fprintf(hf, ",");
                    count++;
                    fprintf(hf, "\n");
                    fprintf(hf,"    %s_%-16s = '%c'", enum_prefix, lt->name, cmd);
                    if (used_cmds[cmd]!=0) { fprintf(stderr, "%s:%d: error: Command %d (%c) was used twice (second time for %s)\n", __FILE__, __LINE__, cmd, cmd, lt->name); abort(); }
                    used_cmds[cmd]=1;
                });
    fprintf(hf, "\n};\n\n");

}

static void
generate_enum (void) {
    generate_enum_internal("lt_cmd", "LT", logtypes);
    generate_enum_internal("rt_cmd", "RT", rollbacks);
}

static void
generate_log_struct (void) {
    DO_LOGTYPES(lt,
                {  fprintf(hf, "struct logtype_%s {\n", lt->name);
                    fprintf(hf, "  %-16s lsn;\n", "LSN");
                    DO_FIELDS(field_type, lt,
                              fprintf(hf, "  %-16s %s;\n", field_type->type, field_type->name));
                    fprintf(hf, "  %-16s crc;\n", "uint32_t");
                    fprintf(hf, "  %-16s len;\n", "uint32_t");
                    fprintf(hf, "};\n");
                    //fprintf(hf, "void toku_recover_%s (LSN lsn", lt->name);
                    //DO_FIELDS(field_type, lt, fprintf(hf, ", %s %s", field_type->type, field_type->name));
                    //fprintf(hf, ");\n");
                });
    DO_ROLLBACKS(lt,
                 {  fprintf(hf, "struct rolltype_%s {\n", lt->name);
                     DO_FIELDS(field_type, lt,
                               fprintf(hf, "  %-16s %s;\n", field_type->type, field_type->name));
                     fprintf(hf, "};\n");
                     fprintf(hf, "int toku_rollback_%s (", lt->name);
                     DO_FIELDS(field_type, lt, fprintf(hf, "%s %s,", field_type->type, field_type->name));
                     fprintf(hf, "TOKUTXN txn, LSN oplsn);\n");
                     fprintf(hf, "int toku_commit_%s (", lt->name);
                     DO_FIELDS(field_type, lt, fprintf(hf, "%s %s,", field_type->type, field_type->name));
                     fprintf(hf, "TOKUTXN txn, LSN oplsn);\n");
                 });
    fprintf(hf, "struct log_entry {\n");
    fprintf(hf, "  enum lt_cmd cmd;\n");
    fprintf(hf, "  union {\n");
    DO_LOGTYPES(lt, fprintf(hf,"    struct logtype_%s %s;\n", lt->name, lt->name));
    fprintf(hf, "  } u;\n");
    fprintf(hf, "};\n");

    fprintf(hf, "struct roll_entry {\n");
    fprintf(hf, "  enum rt_cmd cmd;\n");
    fprintf(hf, "  struct roll_entry *prev; /* for in-memory list of log entries.  Threads from newest to oldest. */\n");
    fprintf(hf, "  union {\n");
    DO_ROLLBACKS(lt, fprintf(hf,"    struct rolltype_%s %s;\n", lt->name, lt->name));
    fprintf(hf, "  } u;\n");
    fprintf(hf, "};\n");

}

static void
generate_dispatch (void) {
    fprintf(hf, "#define rolltype_dispatch(s, funprefix) ({ switch((s)->cmd) {\\\n");
    DO_ROLLBACKS(lt, fprintf(hf, "  case RT_%s: funprefix ## %s (&(s)->u.%s); break;\\\n", lt->name, lt->name, lt->name));
    fprintf(hf, " }})\n");

    fprintf(hf, "#define logtype_dispatch_assign(s, funprefix, var, ...) do { switch((s)->cmd) {\\\n");
    DO_LOGTYPES(lt, fprintf(hf, "  case LT_%s: var = funprefix ## %s (&(s)->u.%s, __VA_ARGS__); break;\\\n", lt->name, lt->name, lt->name));
    fprintf(hf, " }} while (0)\n");

    fprintf(hf, "#define rolltype_dispatch_assign(s, funprefix, var, ...) do { \\\n");
    fprintf(hf, "  switch((s)->cmd) {\\\n");
    DO_ROLLBACKS(lt, {
                    fprintf(hf, "  case RT_%s: var = funprefix ## %s (", lt->name, lt->name);
                    int fieldcount=0;
                    DO_FIELDS(field_type, lt, {
                                if (fieldcount>0) fprintf(hf, ",");
                                fprintf(hf, "(s)->u.%s.%s", lt->name, field_type->name);
                                fieldcount++;
                            });
                    fprintf(hf, ", __VA_ARGS__); break;\\\n");
                });
    fprintf(hf, "  default: assert(0);} } while (0)\n");

    fprintf(hf, "#define logtype_dispatch_args(s, funprefix, ...) do { switch((s)->cmd) {\\\n");
    DO_LOGTYPES(lt,
                {
                    fprintf(hf, "  case LT_%s: funprefix ## %s ((s)->u.%s.lsn", lt->name, lt->name, lt->name);
                    DO_FIELDS(field_type, lt, fprintf(hf, ",(s)->u.%s.%s", lt->name, field_type->name));
                    fprintf(hf, ", __VA_ARGS__); break;\\\n");
                });
    fprintf(hf, " }} while (0)\n");
}

static void
generate_get_timestamp(void) {
    fprintf(cf, "static uint64_t toku_get_timestamp(void) {\n");
    fprintf(cf, "  struct timeval tv; int r = gettimeofday(&tv, NULL);\n");
    fprintf(cf, "  assert(r==0);\n");
    fprintf(cf, "  return tv.tv_sec * 1000000ULL + tv.tv_usec;\n");
    fprintf(cf, "}\n");
}

static void
generate_log_writer (void) {
    generate_get_timestamp();
    DO_LOGTYPES(lt, {
            //TODO(yoni): The overhead variables are NOT correct for BYTESTRING, FILENUMS (or any other variable length type)
            //            We should switch to something like using toku_logsizeof_*.
            fprintf(hf, "static const size_t toku_log_%s_overhead = (+4+1+8", lt->name);
            DO_FIELDS(field_type, lt, fprintf(hf, "+sizeof(%s)", field_type->type));
            fprintf(hf, "+8);\n");
                        fprintf2(cf, hf, "void toku_log_%s (TOKULOGGER logger, LSN *lsnp, int do_fsync", lt->name);
                        switch (lt->log_begin_action) {
                        case SHOULD_LOG_BEGIN:
                        case ASSERT_BEGIN_WAS_LOGGED: {
                            fprintf2(cf, hf, ", TOKUTXN txn");
                            break;
                        }
                        case IGNORE_LOG_BEGIN: break;
                        }
                        DO_FIELDS(field_type, lt, fprintf2(cf, hf, ", %s %s", field_type->type, field_type->name));
                        fprintf(hf, ");\n");
                        fprintf(cf, ") {\n");
                        fprintf(cf, "  if (logger == NULL) {\n");
                        fprintf(cf, "     return;\n");
                        fprintf(cf, "  }\n");
                        switch (lt->log_begin_action) {
                        case SHOULD_LOG_BEGIN: {
                            fprintf(cf, "  //txn can be NULL during tests\n");
                            fprintf(cf, "  //never null when not checkpoint.\n");
                            fprintf(cf, "  if (txn && !txn->begin_was_logged) {\n");
                            fprintf(cf, "    invariant(!txn_declared_read_only(txn));\n");
                            fprintf(cf, "    toku_maybe_log_begin_txn_for_write_operation(txn);\n");
                            fprintf(cf, "  }\n");
                            break;
                        }
                        case ASSERT_BEGIN_WAS_LOGGED: {
                            fprintf(cf, "  //txn can be NULL during tests\n");
                            fprintf(cf, "  invariant(!txn || txn->begin_was_logged);\n");
                            fprintf(cf, "  invariant(!txn || !txn_declared_read_only(txn));\n");
                            break;
                        }
                        case IGNORE_LOG_BEGIN: break;
                        }
                        fprintf(cf, "  if (!logger->write_log_files) {\n");
                        fprintf(cf, "    ml_lock(&logger->input_lock);\n");
                        fprintf(cf, "    logger->lsn.lsn++;\n");
                        fprintf(cf, "    if (lsnp) *lsnp=logger->lsn;\n");
                        fprintf(cf, "    ml_unlock(&logger->input_lock);\n");
                        fprintf(cf, "    return;\n");
                        fprintf(cf, "  }\n");
                        fprintf(cf, "  const unsigned int buflen= (+4 // len at the beginning\n");
                        fprintf(cf, "                              +1 // log command\n");
                        fprintf(cf, "                              +8 // lsn\n");
                        DO_FIELDS(field_type, lt,
                                  fprintf(cf, "                              +toku_logsizeof_%s(%s)\n", field_type->type, field_type->name));
                        fprintf(cf, "                              +8 // crc + len\n");
                        fprintf(cf, "                     );\n");
                        fprintf(cf, "  struct wbuf wbuf;\n");
                        fprintf(cf, "  ml_lock(&logger->input_lock);\n");
                        fprintf(cf, "  toku_logger_make_space_in_inbuf(logger, buflen);\n");
                        fprintf(cf, "  wbuf_nocrc_init(&wbuf, logger->inbuf.buf+logger->inbuf.n_in_buf, buflen);\n");
                        fprintf(cf, "  wbuf_nocrc_int(&wbuf, buflen);\n");
                        fprintf(cf, "  wbuf_nocrc_char(&wbuf, '%c');\n", (char)(0xff&lt->command_and_flags));
                        fprintf(cf, "  logger->lsn.lsn++;\n");
                        fprintf(cf, "  logger->inbuf.max_lsn_in_buf = logger->lsn;\n");
                        fprintf(cf, "  wbuf_nocrc_LSN(&wbuf, logger->lsn);\n");
                        fprintf(cf, "  if (lsnp) *lsnp=logger->lsn;\n");
                        DO_FIELDS(field_type, lt,
                                  if (strcmp(field_type->name, "timestamp") == 0)
                                      fprintf(cf, "  if (timestamp == 0) timestamp = toku_get_timestamp();\n");
                                  fprintf(cf, "  wbuf_nocrc_%s(&wbuf, %s);\n", field_type->type, field_type->name));
                        fprintf(cf, "  wbuf_nocrc_int(&wbuf, toku_x1764_memory(wbuf.buf, wbuf.ndone));\n");
                        fprintf(cf, "  wbuf_nocrc_int(&wbuf, buflen);\n");
                        fprintf(cf, "  assert(wbuf.ndone==buflen);\n");
                        fprintf(cf, "  logger->inbuf.n_in_buf += buflen;\n");
                        fprintf(cf, "  toku_logger_maybe_fsync(logger, logger->lsn, do_fsync, true);\n");
                        fprintf(cf, "}\n\n");
                    });
}

static void
generate_log_reader (void) {
    DO_LOGTYPES(lt, {
                        fprintf(cf, "static int toku_log_fread_%s (FILE *infile, uint32_t len1, struct logtype_%s *data, struct x1764 *checksum)", lt->name, lt->name);
                        fprintf(cf, " {\n");
                        fprintf(cf, "  int r=0;\n");
                        fprintf(cf, "  uint32_t actual_len=5; // 1 for the command, 4 for the first len.\n");
                        fprintf(cf, "  r=toku_fread_%-16s(infile, &data->%-16s, checksum, &actual_len); if (r!=0) return r;\n", "LSN", "lsn");
                        DO_FIELDS(field_type, lt,
                                  fprintf(cf, "  r=toku_fread_%-16s(infile, &data->%-16s, checksum, &actual_len); if (r!=0) return r;\n", field_type->type, field_type->name));
                        fprintf(cf, "  uint32_t checksum_in_file, len_in_file;\n");
                        fprintf(cf, "  r=toku_fread_uint32_t_nocrclen(infile, &checksum_in_file); actual_len+=4;   if (r!=0) return r;\n");
                        fprintf(cf, "  r=toku_fread_uint32_t_nocrclen(infile, &len_in_file);    actual_len+=4;   if (r!=0) return r;\n");
                        fprintf(cf, "  if (checksum_in_file!=toku_x1764_finish(checksum) || len_in_file!=actual_len || len1 != len_in_file) return DB_BADFORMAT;\n");
                        fprintf(cf, "  return 0;\n");
                        fprintf(cf, "}\n\n");
                    });
    fprintf2(cf, hf, "int toku_log_fread (FILE *infile, struct log_entry *le)");
    fprintf(hf, ";\n");
    fprintf(cf, " {\n");
    fprintf(cf, "  uint32_t len1; int r;\n");
    fprintf(cf, "  uint32_t ignorelen=0;\n");
    fprintf(cf, "  struct x1764 checksum;\n");
    fprintf(cf, "  toku_x1764_init(&checksum);\n");
    fprintf(cf, "  r = toku_fread_uint32_t(infile, &len1, &checksum, &ignorelen); if (r!=0) return r;\n");
    fprintf(cf, "  int cmd=fgetc(infile);\n");
    fprintf(cf, "  if (cmd==EOF) return EOF;\n");
    fprintf(cf, "  char cmdchar = (char)cmd;\n");
    fprintf(cf, "  toku_x1764_add(&checksum, &cmdchar, 1);\n");
    fprintf(cf, "  le->cmd=(enum lt_cmd)cmd;\n");
    fprintf(cf, "  switch ((enum lt_cmd)cmd) {\n");
    DO_LOGTYPES(lt, {
                        fprintf(cf, "  case LT_%s:\n", lt->name);
                        fprintf(cf, "    return toku_log_fread_%s (infile, len1, &le->u.%s, &checksum);\n", lt->name, lt->name);
                    });
    fprintf(cf, "  };\n");
    fprintf(cf, "  return DB_BADFORMAT;\n"); // Should read past the record using the len field.
    fprintf(cf, "}\n\n");
    //fprintf2(cf, hf, "// Return 0 if there is something to read, return -1 if nothing to read, abort if an error.\n");
    fprintf2(cf, hf, "// Return 0 if there is something to read, -1 if nothing to read, >0 on error\n");
    fprintf2(cf, hf, "int toku_log_fread_backward (FILE *infile, struct log_entry *le)");
    fprintf(hf, ";\n");
    fprintf(cf, "{\n");
    fprintf(cf, "  memset(le, 0, sizeof(*le));\n");
    fprintf(cf, "  long pos = ftell(infile);\n");
    fprintf(cf, "  if (pos<=12) return -1;\n");
    fprintf(cf, "  int r = fseek(infile, -4, SEEK_CUR); \n");//              assert(r==0);\n");
    fprintf(cf, "  if (r!=0) return get_error_errno();\n");
    fprintf(cf, "  uint32_t len;\n");
    fprintf(cf, "  r = toku_fread_uint32_t_nocrclen(infile, &len); \n");//  assert(r==0);\n");
    fprintf(cf, "  if (r!=0) return 1;\n");
    fprintf(cf, "  r = fseek(infile, -(int)len, SEEK_CUR) ;  \n");//         assert(r==0);\n");
    fprintf(cf, "  if (r!=0) return get_error_errno();\n");
    fprintf(cf, "  r = toku_log_fread(infile, le); \n");//                   assert(r==0);\n");
    fprintf(cf, "  if (r!=0) return 1;\n");
    fprintf(cf, "  long afterpos = ftell(infile);\n");
    fprintf(cf, "  if (afterpos != pos) return 1;\n");
    fprintf(cf, "  r = fseek(infile, -(int)len, SEEK_CUR); \n");//           assert(r==0);\n");
    fprintf(cf, "  if (r!=0) return get_error_errno();\n");
    fprintf(cf, "  return 0;\n");
    fprintf(cf, "}\n\n");

    DO_LOGTYPES(lt, ({
            fprintf(cf, "static void toku_log_free_log_entry_%s_resources (struct logtype_%s *data", lt->name, lt->name);
            if (!lt->fields->type) fprintf(cf, " __attribute__((__unused__))");
            fprintf(cf, ") {\n");
            DO_FIELDS(field_type, lt,
                      fprintf(cf, "    toku_free_%s(data->%s);\n", field_type->type, field_type->name);
                      );
            fprintf(cf, "}\n\n");
            }));
    fprintf2(cf, hf, "void toku_log_free_log_entry_resources (struct log_entry *le)");
    fprintf(hf, ";\n");
    fprintf(cf, " {\n");
    fprintf(cf, "    switch ((enum lt_cmd)le->cmd) {\n");
    DO_LOGTYPES(lt, {
            fprintf(cf, "    case LT_%s:\n", lt->name);
            fprintf(cf, "        return toku_log_free_log_entry_%s_resources (&(le->u.%s));\n", lt->name, lt->name);
        });
    fprintf(cf, "    };\n");
    fprintf(cf, "    return;\n");
    fprintf(cf, "}\n\n");
}

static void
generate_logprint (void) {
    unsigned maxnamelen=0;
    fprintf2(pf, hf, "int toku_logprint_one_record(FILE *outf, FILE *f)");
    fprintf(hf, ";\n");
    fprintf(pf, " {\n");
    fprintf(pf, "    int cmd, r;\n");
    fprintf(pf, "    uint32_t len1, crc_in_file;\n");
    fprintf(pf, "    uint32_t ignorelen=0;\n");
    fprintf(pf, "    struct x1764 checksum;\n");
    fprintf(pf, "    toku_x1764_init(&checksum);\n");
    fprintf(pf, "    r=toku_fread_uint32_t(f, &len1, &checksum, &ignorelen);\n");
    fprintf(pf, "    if (r==EOF) return EOF;\n");
    fprintf(pf, "    cmd=fgetc(f);\n");
    fprintf(pf, "    if (cmd==EOF) return DB_BADFORMAT;\n");
    fprintf(pf, "    uint32_t len_in_file, len=1+4; // cmd + len1\n");
    fprintf(pf, "    char charcmd = (char)cmd;\n");
    fprintf(pf, "    toku_x1764_add(&checksum, &charcmd, 1);\n");
    fprintf(pf, "    switch ((enum lt_cmd)cmd) {\n");
    DO_LOGTYPES(lt, { if (strlen(lt->name)>maxnamelen) maxnamelen=strlen(lt->name); });
    DO_LOGTYPES(lt, {
                unsigned char cmd = (unsigned char)(0xff&lt->command_and_flags);
                fprintf(pf, "    case LT_%s: \n", lt->name);
                // We aren't using the log reader here because we want better diagnostics as soon as things go wrong.
                fprintf(pf, "        fprintf(outf, \"%%-%us \", \"%s\");\n", maxnamelen, lt->name);
                if (isprint(cmd)) fprintf(pf,"        fprintf(outf, \" '%c':\");\n", cmd);
                else                      fprintf(pf,"        fprintf(outf, \"0%03o:\");\n", cmd);
                fprintf(pf, "        r = toku_logprint_%-16s(outf, f, \"lsn\", &checksum, &len, 0);     if (r!=0) return r;\n", "LSN");
                DO_FIELDS(field_type, lt, {
                            fprintf(pf, "        r = toku_logprint_%-16s(outf, f, \"%s\", &checksum, &len,", field_type->type, field_type->name);
                            if (field_type->format) fprintf(pf, "\"%s\"", field_type->format);
                            else            fprintf(pf, "0");
                            fprintf(pf, "); if (r!=0) return r;\n");
                        });
                fprintf(pf, "        {\n");
                fprintf(pf, "          uint32_t actual_murmur = toku_x1764_finish(&checksum);\n");
                fprintf(pf, "          r = toku_fread_uint32_t_nocrclen (f, &crc_in_file); len+=4; if (r!=0) return r;\n");
                fprintf(pf, "          fprintf(outf, \" crc=%%08x\", crc_in_file);\n");
                fprintf(pf, "          if (crc_in_file!=actual_murmur) fprintf(outf, \" checksum=%%08x\", actual_murmur);\n");
                fprintf(pf, "          r = toku_fread_uint32_t_nocrclen (f, &len_in_file); len+=4; if (r!=0) return r;\n");
                fprintf(pf, "          fprintf(outf, \" len=%%u\", len_in_file);\n");
                fprintf(pf, "          if (len_in_file!=len) fprintf(outf, \" actual_len=%%u\", len);\n");
                fprintf(pf, "          if (len_in_file!=len || crc_in_file!=actual_murmur) return DB_BADFORMAT;\n");
                fprintf(pf, "        };\n");
                fprintf(pf, "        fprintf(outf, \"\\n\");\n");
                fprintf(pf, "        return 0;\n\n");
            });
    fprintf(pf, "    }\n");
    fprintf(pf, "    fprintf(outf, \"Unknown command %%d ('%%c')\", cmd, cmd);\n");
    fprintf(pf, "    return DB_BADFORMAT;\n");
    fprintf(pf, "}\n\n");
}

static void
generate_rollbacks (void) {
    DO_ROLLBACKS(lt, {
                    fprintf2(cf, hf, "void toku_logger_save_rollback_%s (TOKUTXN txn", lt->name);
                    DO_FIELDS(field_type, lt, {
                        if ( strcmp(field_type->type, "BYTESTRING") == 0 ) {
                            fprintf2(cf, hf, ", BYTESTRING *%s_ptr", field_type->name);
                        } 
                        else if ( strcmp(field_type->type, "FILENUMS") == 0 ) {
                            fprintf2(cf, hf, ", FILENUMS *%s_ptr", field_type->name);
                        }
                        else {
                            fprintf2(cf, hf, ", %s %s", field_type->type, field_type->name);
                        }
                    });

                    fprintf(hf, ");\n");
                    fprintf(cf, ") {\n");
                    fprintf(cf, "  toku_txn_lock(txn);\n");
                    fprintf(cf, "  ROLLBACK_LOG_NODE log;\n");
                    fprintf(cf, "  toku_get_and_pin_rollback_log_for_new_entry(txn, &log);\n");
                    // 'memdup' all BYTESTRINGS here
                    DO_FIELDS(field_type, lt, {
                        if ( strcmp(field_type->type, "BYTESTRING") == 0 ) {
                            fprintf(cf, "  BYTESTRING %s   = {\n"
                                    "    .len  = %s_ptr->len,\n"
                                    "    .data = cast_to_typeof(%s.data) toku_memdup_in_rollback(log, %s_ptr->data, %s_ptr->len)\n"
                                    "  };\n",
                                    field_type->name, field_type->name, field_type->name, field_type->name, field_type->name);
                        }
                        if ( strcmp(field_type->type, "FILENUMS") == 0 ) {
                            fprintf(cf, "  FILENUMS %s   = {\n"
                                    "    .num  = %s_ptr->num,\n"
                                    "    .filenums = cast_to_typeof(%s.filenums) toku_memdup_in_rollback(log, %s_ptr->filenums, %s_ptr->num * (sizeof (FILENUM)))\n"
                                    "  };\n",
                                    field_type->name, field_type->name, field_type->name, field_type->name, field_type->name);
                        }
                    });
                    {
                        int count=0;
                        fprintf(cf, "  uint32_t rollback_fsize = toku_logger_rollback_fsize_%s(", lt->name);
                        DO_FIELDS(field_type, lt, fprintf(cf, "%s%s", (count++>0)?", ":"", field_type->name));
                        fprintf(cf, ");\n");
                    }
                    fprintf(cf, "  struct roll_entry *v;\n");
                    fprintf(cf, "  size_t mem_needed = sizeof(v->u.%s) + __builtin_offsetof(struct roll_entry, u.%s);\n", lt->name, lt->name);
                    fprintf(cf, "  CAST_FROM_VOIDP(v, toku_malloc_in_rollback(log, mem_needed));\n");
                    fprintf(cf, "  assert(v);\n");
                    fprintf(cf, "  v->cmd = (enum rt_cmd)%u;\n", lt->command_and_flags&0xff);
                    DO_FIELDS(field_type, lt, fprintf(cf, "  v->u.%s.%s = %s;\n", lt->name, field_type->name, field_type->name));
                    fprintf(cf, "  v->prev = log->newest_logentry;\n");
                    fprintf(cf, "  if (log->oldest_logentry==NULL) log->oldest_logentry=v;\n");
                    fprintf(cf, "  log->newest_logentry = v;\n");
                    fprintf(cf, "  log->rollentry_resident_bytecount += rollback_fsize;\n");
                    fprintf(cf, "  txn->roll_info.rollentry_raw_count          += rollback_fsize;\n");
                    fprintf(cf, "  txn->roll_info.num_rollentries++;\n");
                    fprintf(cf, "  log->dirty = true;\n");
                    fprintf(cf, "  // spill and unpin assert success internally\n");
                    fprintf(cf, "  toku_maybe_spill_rollbacks(txn, log);\n");
                    fprintf(cf, "  toku_rollback_log_unpin(txn, log);\n");
                    fprintf(cf, "  toku_txn_unlock(txn);\n");
                    fprintf(cf, "}\n");
            });

    DO_ROLLBACKS(lt, {
                fprintf2(cf, hf, "void toku_logger_rollback_wbuf_nocrc_write_%s (struct wbuf *wbuf", lt->name);
                DO_FIELDS(field_type, lt, fprintf2(cf, hf, ", %s %s", field_type->type, field_type->name));
                fprintf2(cf, hf, ")");
                fprintf(hf, ";\n");
                fprintf(cf, " {\n");

                {
                    int count=0;
                    fprintf(cf, "  uint32_t rollback_fsize = toku_logger_rollback_fsize_%s(", lt->name);
                    DO_FIELDS(field_type, lt, fprintf(cf, "%s%s", (count++>0)?", ":"", field_type->name));
                    fprintf(cf, ");\n");
                    fprintf(cf, "  wbuf_nocrc_int(wbuf, rollback_fsize);\n");
                }
                fprintf(cf, "  wbuf_nocrc_char(wbuf, '%c');\n", (char)(0xff&lt->command_and_flags));
                DO_FIELDS(field_type, lt, fprintf(cf, "  wbuf_nocrc_%s(wbuf, %s);\n", field_type->type, field_type->name));
                fprintf(cf, "}\n");
            });
    fprintf2(cf, hf, "void toku_logger_rollback_wbuf_nocrc_write (struct wbuf *wbuf, struct roll_entry *r)");
    fprintf(hf, ";\n");
    fprintf(cf, " {\n  switch (r->cmd) {\n");
    DO_ROLLBACKS(lt, {
                fprintf(cf, "    case RT_%s: toku_logger_rollback_wbuf_nocrc_write_%s(wbuf", lt->name, lt->name);
                DO_FIELDS(field_type, lt, fprintf(cf, ", r->u.%s.%s", lt->name, field_type->name));
                fprintf(cf, "); return;\n");
            });
    fprintf(cf, "  }\n  assert(0);\n");
    fprintf(cf, "}\n");
    DO_ROLLBACKS(lt, {
                fprintf2(cf, hf, "uint32_t toku_logger_rollback_fsize_%s (", lt->name);
                int count=0;
                DO_FIELDS(field_type, lt, fprintf2(cf, hf, "%s%s %s", (count++>0)?", ":"", field_type->type, field_type->name));
                fprintf(hf, ");\n");
                fprintf(cf, ") {\n");
                fprintf(cf, "  return 1 /* the cmd*/\n");
                fprintf(cf, "         + 4 /* the int at the end saying the size */");
                DO_FIELDS(field_type, lt,
                          fprintf(cf, "\n         + toku_logsizeof_%s(%s)", field_type->type, field_type->name));
                fprintf(cf, ";\n}\n");
            });
    fprintf2(cf, hf, "uint32_t toku_logger_rollback_fsize(struct roll_entry *item)");
    fprintf(hf, ";\n");
    fprintf(cf, "{\n  switch(item->cmd) {\n");
    DO_ROLLBACKS(lt, {
                fprintf(cf, "    case RT_%s: return toku_logger_rollback_fsize_%s(", lt->name, lt->name);
                int count=0;
                DO_FIELDS(field_type, lt, fprintf(cf, "%sitem->u.%s.%s", (count++>0)?", ":"", lt->name, field_type->name));
                fprintf(cf, ");\n");
            });
    fprintf(cf, "  }\n  assert(0);\n  return 0;\n");
    fprintf(cf, "}\n");

    fprintf2(cf, hf, "int toku_parse_rollback(unsigned char *buf, uint32_t n_bytes, struct roll_entry **itemp, memarena *ma)");
    fprintf(hf, ";\n");
    fprintf(cf, " {\n  assert(n_bytes>0);\n  struct roll_entry *item;\n  enum rt_cmd cmd = (enum rt_cmd)(buf[0]);\n  size_t mem_needed;\n");
    fprintf(cf, "  struct rbuf rc = {buf, n_bytes, 1};\n");
    fprintf(cf, "  switch(cmd) {\n");
    DO_ROLLBACKS(lt, {
                fprintf(cf, "  case RT_%s:\n", lt->name);
                fprintf(cf, "    mem_needed = sizeof(item->u.%s) + __builtin_offsetof(struct roll_entry, u.%s);\n", lt->name, lt->name);
                fprintf(cf, "    CAST_FROM_VOIDP(item, ma->malloc_from_arena(mem_needed));\n");
                fprintf(cf, "    item->cmd = cmd;\n");
                DO_FIELDS(field_type, lt, fprintf(cf, "    rbuf_ma_%s(&rc, ma, &item->u.%s.%s);\n", field_type->type, lt->name, field_type->name));
                fprintf(cf, "    *itemp = item;\n");
                fprintf(cf, "    return 0;\n");
        });
    fprintf(cf, "  }\n  return EINVAL;\n}\n");
}

static void
generate_log_entry_functions(void) {
    fprintf(hf, "LSN toku_log_entry_get_lsn(struct log_entry *);\n");
    fprintf(cf, "LSN toku_log_entry_get_lsn(struct log_entry *le) {\n");
    fprintf(cf, "    return le->u.begin_checkpoint.lsn;\n");
    fprintf(cf, "}\n");
}

const char codefile[] = "log_code.cc";
const char printfile[] = "log_print.cc";
const char headerfile[] = "log_header.h";
int main (int argc, const char *const argv[]) {
    assert(argc==2); // the single argument is the directory into which to put things
    const char *dir = argv[1];
    size_t codepathlen   = sizeof(codefile) + strlen(dir) + 4;
    size_t printpathlen  = sizeof(printfile) + strlen(dir) + 4; 
    size_t headerpathlen = sizeof(headerfile) + strlen(dir) + 4; 
    char codepath[codepathlen];
    char printpath[printpathlen];
    char headerpath[headerpathlen];
    { int r = snprintf(codepath,   codepathlen,   "%s/%s", argv[1], codefile);    assert(r<(int)codepathlen); }
    { int r = snprintf(printpath,  printpathlen,  "%s/%s", argv[1], printfile);   assert(r<(int)printpathlen); }
    { int r = snprintf(headerpath, headerpathlen, "%s/%s", argv[1], headerfile);  assert(r<(int)headerpathlen); }
    chmod(codepath, S_IRUSR|S_IWUSR);
    chmod(headerpath, S_IRUSR|S_IWUSR);
    unlink(codepath);
    unlink(headerpath);
    cf = fopen(codepath, "w");
    if (cf==0) { int r = get_error_errno(); printf("fopen of %s failed because of errno=%d (%s)\n", codepath, r, strerror(r)); } // sometimes this is failing, so let's make a better diagnostic
    assert(cf!=0);
    hf = fopen(headerpath, "w");     assert(hf!=0);
    pf = fopen(printpath, "w");   assert(pf!=0);
    fprintf2(cf, hf, "/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */\n");
    fprintf2(cf, hf, "// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:\n");
    fprintf(hf, "#pragma once\n");
    fprintf2(cf, hf, "/* Do not edit this file.  This code generated by logformat.c.  Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.    */\n");
    fprintf2(cf, hf, "#ident \"Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.\"\n");
    fprintf2(cf, pf, "#include <stdint.h>\n");
    fprintf2(cf, pf, "#include <sys/time.h>\n");
    fprintf2(cf, pf, "#include <ft/logger/log-internal.h>\n");
    fprintf(hf, "#include <ft/ft-internal.h>\n");
    fprintf(hf, "#include <util/bytestring.h>\n");
    fprintf(hf, "#include <util/memarena.h>\n");
    generate_enum();
    generate_log_struct();
    generate_dispatch();
    generate_log_writer();
    generate_log_reader();
    generate_rollbacks();
    generate_log_entry_functions();
    generate_logprint();
    {
        int r=fclose(hf); assert(r==0);
        r=fclose(cf); assert(r==0);
        r=fclose(pf); assert(r==0);
        // Make it tougher to modify by mistake
        chmod(codepath, S_IRUSR|S_IRGRP|S_IROTH);
        chmod(headerpath, S_IRUSR|S_IRGRP|S_IROTH);
    }
    return 0;
}