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150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
/* Copyright (C) 1993,1994,1995,1997,2000,2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysdep.h>
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#include <unistd.h>
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#include <sys/syslog.h>
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#include <sys/uio.h>
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#include <not-cancel.h>
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#ifdef FATAL_PREPARE_INCLUDE
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#include FATAL_PREPARE_INCLUDE
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#endif
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struct str_list
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{
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const char *str;
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size_t len;
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struct str_list *next;
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};
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/* Abort with an error message. */
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void
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__libc_message (int do_abort, const char *fmt, ...)
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{
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va_list ap;
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va_list ap_copy;
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int fd = -1;
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va_start (ap, fmt);
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va_copy (ap_copy, ap);
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#ifdef FATAL_PREPARE
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FATAL_PREPARE;
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#endif
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/* Open a descriptor for /dev/tty unless the user explicitly
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requests errors on standard error. */
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const char *on_2 = __secure_getenv ("LIBC_FATAL_STDERR_");
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if (on_2 == NULL || *on_2 == '\0')
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fd = open_not_cancel_2 (_PATH_TTY, O_RDWR | O_NOCTTY | O_NDELAY);
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if (fd == -1)
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fd = STDERR_FILENO;
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struct str_list *list = NULL;
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int nlist = 0;
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const char *cp = fmt;
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while (*cp != '\0')
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{
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/* Find the next "%s" or the end of the string. */
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char *next = cp;
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while (next[0] != '%' || next[1] != 's')
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{
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next = __strchrnul (next + 1, '%');
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if (next[0] == '\0')
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break;
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}
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/* Determine what to print. */
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const char *str;
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size_t len;
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if (cp[0] == '%' && cp[1] == 's')
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{
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str = va_arg (ap, const char *);
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len = strlen (str);
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cp += 2;
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}
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else
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{
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str = cp;
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len = next - cp;
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cp = next;
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}
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struct str_list *newp = alloca (sizeof (struct str_list));
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newp->str = str;
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newp->len = len;
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newp->next = list;
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list = newp;
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++nlist;
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}
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bool written = false;
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if (nlist > 0)
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{
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struct iovec *iov = alloca (nlist * sizeof (struct iovec));
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ssize_t total = 0;
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for (int cnt = nlist - 1; cnt >= 0; --cnt)
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{
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iov[cnt].iov_base = list->str;
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iov[cnt].iov_len = list->len;
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total += list->len;
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list = list->next;
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}
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if (TEMP_FAILURE_RETRY (__writev (fd, iov, nlist)) == total)
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written = true;
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}
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va_end (ap);
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/* If we had no success writing the message, use syslog. */
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if (! written)
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vsyslog (LOG_ERR, fmt, ap_copy);
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va_end (ap_copy);
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if (do_abort)
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/* Kill the application. */
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abort ();
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}
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void
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__libc_fatal (message)
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const char *message;
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{
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/* The loop is added only to keep gcc happy. */
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while (1)
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__libc_message (1, "%s", message);
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}
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libc_hidden_def (__libc_fatal)
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