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https://sourceware.org/git/glibc.git
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144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/* Catastrophic failure reports. Generic POSIX.1 version.
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Copyright (C) 1993-2023 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, see
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<https://www.gnu.org/licenses/>. */
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#include <atomic.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ldsodefs.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/mman.h>
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#include <sys/uio.h>
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#include <not-cancel.h>
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#include <setvmaname.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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#ifndef WRITEV_FOR_FATAL
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# define WRITEV_FOR_FATAL writev_for_fatal
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static bool
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writev_for_fatal (int fd, const struct iovec *iov, size_t niov, size_t total)
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{
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return TEMP_FAILURE_RETRY (__writev (fd, iov, niov)) == total;
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}
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#endif
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/* Abort with an error message. */
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void
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__libc_message_impl (const char *fmt, ...)
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{
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va_list ap;
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int fd = -1;
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#ifdef FATAL_PREPARE
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FATAL_PREPARE;
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#endif
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if (fd == -1)
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fd = STDERR_FILENO;
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struct iovec iov[LIBC_MESSAGE_MAX_ARGS * 2 - 1];
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int iovcnt = 0;
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ssize_t total = 0;
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va_start (ap, fmt);
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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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const 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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iov[iovcnt].iov_base = (char *) str;
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iov[iovcnt].iov_len = len;
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total += len;
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iovcnt++;
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}
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va_end (ap);
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if (iovcnt > 0)
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{
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WRITEV_FOR_FATAL (fd, iov, iovcnt, total);
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total = (total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
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struct abort_msg_s *buf = __mmap (NULL, total,
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PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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if (__glibc_likely (buf != MAP_FAILED))
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{
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buf->size = total;
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char *wp = buf->msg;
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for (int cnt = 0; cnt < iovcnt; ++cnt)
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wp = mempcpy (wp, iov[cnt].iov_base, iov[cnt].iov_len);
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*wp = '\0';
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__set_vma_name (buf, total, " glibc: fatal");
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/* We have to free the old buffer since the application might
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catch the SIGABRT signal. */
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struct abort_msg_s *old = atomic_exchange_acquire (&__abort_msg,
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buf);
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if (old != NULL)
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__munmap (old, old->size);
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}
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}
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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 (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 ("%s", message);
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}
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libc_hidden_def (__libc_fatal)
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