diff options
Diffstat (limited to 'sysdep/unix/log.c')
| -rw-r--r-- | sysdep/unix/log.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sysdep/unix/log.c b/sysdep/unix/log.c index 185231e8..d09481bc 100644 --- a/sysdep/unix/log.c +++ b/sysdep/unix/log.c @@ -32,6 +32,7 @@ #include "lib/lists.h" #include "sysdep/unix/unix.h" +static int dbg_fd = -1; static FILE *dbgf; static list *current_log_list; static char *current_syslog_name; /* NULL -> syslog closed */ @@ -341,6 +342,21 @@ debug(const char *msg, ...) va_end(args); } +/** + * debug_safe - async-safe write to debug output + * @msg: a string message + * + * This function prints the message @msg to the debugging output in a + * way that is async safe and can be used in signal handlers. No newline + * character is appended. + */ +void +debug_safe(const char *msg) +{ + if (dbg_fd >= 0) + write(dbg_fd, msg, strlen(msg)); +} + static list * default_log_list(int initial, const char **syslog_name) { @@ -441,8 +457,10 @@ log_init_debug(char *f) { clock_gettime(CLOCK_MONOTONIC, &dbg_time_start); + dbg_fd = -1; if (dbgf && dbgf != stderr) fclose(dbgf); + if (!f) dbgf = NULL; else if (!*f) @@ -453,6 +471,10 @@ log_init_debug(char *f) fprintf(stderr, "bird: Unable to open debug file %s: %s\n", f, strerror(errno)); exit(1); } + if (dbgf) + { setvbuf(dbgf, NULL, _IONBF, 0); + dbg_fd = fileno(dbgf); + } } |