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glibc/sysdeps/unix/sysv/linux/libc_fatal.c
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/* Copyright (C) 1993-1995,1997,2000,2002-2004 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <paths.h> | |
#include <stdarg.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <sysdep.h> | |
#include <unistd.h> | |
#include <sys/syslog.h> | |
/* Abort with an error message. */ | |
#include <not-cancel.h> | |
#ifdef FATAL_PREPARE_INCLUDE | |
#include FATAL_PREPARE_INCLUDE | |
#endif | |
struct str_list | |
{ | |
const char *str; | |
size_t len; | |
struct str_list *next; | |
}; | |
/* Abort with an error message. */ | |
void | |
__libc_message (int do_abort, const char *fmt, ...) | |
{ | |
va_list ap; | |
va_list ap_copy; | |
int fd = -1; | |
va_start (ap, fmt); | |
va_copy (ap_copy, ap); | |
#ifdef FATAL_PREPARE | |
FATAL_PREPARE; | |
#endif | |
/* Open a descriptor for /dev/tty unless the user explicitly | |
requests errors on standard error. */ | |
const char *on_2 = __secure_getenv ("LIBC_FATAL_STDERR_"); | |
if (on_2 == NULL || *on_2 == '\0') | |
fd = open_not_cancel_2 (_PATH_TTY, O_RDWR | O_NOCTTY | O_NDELAY); | |
if (fd == -1) | |
fd = STDERR_FILENO; | |
struct str_list *list = NULL; | |
int nlist = 0; | |
const char *cp = fmt; | |
while (*cp != '\0') | |
{ | |
/* Find the next "%s" or the end of the string. */ | |
const char *next = cp; | |
while (next[0] != '%' || next[1] != 's') | |
{ | |
next = __strchrnul (next + 1, '%'); | |
if (next[0] == '\0') | |
break; | |
} | |
/* Determine what to print. */ | |
const char *str; | |
size_t len; | |
if (cp[0] == '%' && cp[1] == 's') | |
{ | |
str = va_arg (ap, const char *); | |
len = strlen (str); | |
cp += 2; | |
} | |
else | |
{ | |
str = cp; | |
len = next - cp; | |
cp = next; | |
} | |
struct str_list *newp = alloca (sizeof (struct str_list)); | |
newp->str = str; | |
newp->len = len; | |
newp->next = list; | |
list = newp; | |
++nlist; | |
} | |
bool written = false; | |
if (nlist > 0) | |
{ | |
struct iovec *iov = alloca (nlist * sizeof (struct iovec)); | |
ssize_t total = 0; | |
for (int cnt = nlist - 1; cnt >= 0; --cnt) | |
{ | |
iov[cnt].iov_base = (void *) list->str; | |
iov[cnt].iov_len = list->len; | |
total += list->len; | |
list = list->next; | |
} | |
INTERNAL_SYSCALL_DECL (err); | |
ssize_t cnt; | |
do | |
cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, nlist); | |
while (INTERNAL_SYSCALL_ERROR_P (cnt, err) | |
&& INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR); | |
if (cnt == total) | |
written = true; | |
} | |
va_end (ap); | |
/* If we had no success writing the message, use syslog. */ | |
if (! written) | |
vsyslog (LOG_ERR, fmt, ap_copy); | |
va_end (ap_copy); | |
if (do_abort) | |
/* Terminate the process. */ | |
abort (); | |
} | |
void | |
__libc_fatal (message) | |
const char *message; | |
{ | |
/* The loop is added only to keep gcc happy. */ | |
while (1) | |
__libc_message (1, "%s", message); | |
} | |
libc_hidden_def (__libc_fatal) |