diff options
| -rw-r--r-- | misc/syslog.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/misc/syslog.c b/misc/syslog.c index fd6537edf6..2cc63ef287 100644 --- a/misc/syslog.c +++ b/misc/syslog.c @@ -91,14 +91,20 @@ struct cleanup_arg static void cancel_handler (void *ptr) { -#ifndef NO_SIGPIPE /* Restore the old signal handler. */ struct cleanup_arg *clarg = (struct cleanup_arg *) ptr; - if (clarg != NULL && clarg->oldaction != NULL) - __sigaction (SIGPIPE, clarg->oldaction, NULL); + if (clarg != NULL) + { +#ifndef NO_SIGPIPE + if (clarg->oldaction != NULL) + __sigaction (SIGPIPE, clarg->oldaction, NULL); #endif + /* Free the memstream buffer, */ + free (clarg->buf); + } + /* Free the lock. */ __libc_lock_unlock (syslog_lock); } @@ -169,9 +175,17 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, pri &= LOG_PRIMASK|LOG_FACMASK; } + /* Prepare for multiple users. We have to take care: most + syscalls we are using are cancellation points. */ + struct cleanup_arg clarg; + clarg.buf = NULL; + clarg.oldaction = NULL; + __libc_cleanup_push (cancel_handler, &clarg); + __libc_lock_lock (syslog_lock); + /* Check priority against setlogmask values. */ if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0) - return; + goto out; /* Set default facility if none specified. */ if ((pri & LOG_FACMASK) == 0) @@ -235,6 +249,9 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, /* Close the memory stream; this will finalize the data into a malloc'd buffer in BUF. */ fclose (f); + + /* Tell the cancellation handler to free this buffer. */ + clarg.buf = buf; } /* Output to stderr if requested. */ @@ -252,22 +269,10 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, v->iov_len = 1; } - __libc_cleanup_push (free, buf == failbuf ? NULL : buf); - /* writev is a cancellation point. */ (void)__writev(STDERR_FILENO, iov, v - iov + 1); - - __libc_cleanup_pop (0); } - /* Prepare for multiple users. We have to take care: open and - write are cancellation points. */ - struct cleanup_arg clarg; - clarg.buf = buf; - clarg.oldaction = NULL; - __libc_cleanup_push (cancel_handler, &clarg); - __libc_lock_lock (syslog_lock); - #ifndef NO_SIGPIPE /* Prepare for a broken connection. */ memset (&action, 0, sizeof (action)); @@ -320,6 +325,7 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL); #endif + out: /* End of critical section. */ __libc_cleanup_pop (0); __libc_lock_unlock (syslog_lock); @@ -430,8 +436,14 @@ setlogmask (int pmask) { int omask; + /* Protect against multiple users. */ + __libc_lock_lock (syslog_lock); + omask = LogMask; if (pmask != 0) LogMask = pmask; + + __libc_lock_unlock (syslog_lock); + return (omask); } |