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/* Catastrophic failure reports. Generic POSIX.1 version.
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Copyright (C) 1993-2018 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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<http://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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#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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#ifndef BEFORE_ABORT
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# define BEFORE_ABORT before_abort
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static void
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before_abort (int do_abort __attribute__ ((unused)),
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bool written __attribute__ ((unused)),
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int fd __attribute__ ((unused)))
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{
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}
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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 (enum __libc_message_action action, 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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va_start (ap, fmt);
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#ifdef FATAL_PREPARE
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FATAL_PREPARE;
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#endif
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/* Don't call __libc_secure_getenv if we aren't doing backtrace, which
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may access the corrupted stack. */
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if ((action & do_backtrace))
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{
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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 = __libc_secure_getenv ("LIBC_FATAL_STDERR_");
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if (on_2 == NULL || *on_2 == '\0')
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fd = __open_nocancel (_PATH_TTY, O_RDWR | O_NOCTTY | O_NDELAY);
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}
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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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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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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 = (char *) 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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written = WRITEV_FOR_FATAL (fd, iov, nlist, total);
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if ((action & do_abort))
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{
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total = ((total + 1 + GLRO(dl_pagesize) - 1)
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& ~(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 < nlist; ++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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/* 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_acq (&__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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}
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va_end (ap);
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if ((action & do_abort))
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{
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if ((action & do_backtrace))
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BEFORE_ABORT (do_abort, written, fd);
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/* Kill the application. */
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abort ();
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}
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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 (do_abort | do_backtrace, "%s", message);
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}
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libc_hidden_def (__libc_fatal)
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