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Consolidate Linux and POSIX libc_fatal code.
This commit is contained in:
Roland McGrath
parent
6b18bea625
commit
a600e5cef5
16
ChangeLog
16
ChangeLog
@ -1,3 +1,19 @@
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2013-03-19 Roland McGrath <roland@hack.frob.com>
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* sysdeps/posix/libc_fatal.c: Include <sys/mman.h>.
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[!WRITEV_FOR_FATAL] (writev_for_fatal): New function.
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[!WRITEV_FOR_FATAL] (WRITEV_FOR_FATAL): New macro; call that.
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[!BEFORE_ABORT] (before_abort): New function.
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[!BEFORE_ABORT] (BEFORE_ABORT): New macro; call that.
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* sysdeps/unix/sysv/linux/libc_fatal.c: Trim includes.
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(writev_for_fatal): New function.
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(WRITEV_FOR_FATAL): New macro; call that.
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(backtrace_and_maps): New function.
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(BEFORE_ABORT): New macro; call that.
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(struct str_list): Type removed.
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(__libc_message, __libc_fatal): Functions removed.
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Include <sysdeps/posix/libc_fatal.c> instead.
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2013-03-19 Joseph Myers <joseph@codesourcery.com>
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* math/k_casinhf.c (__kernel_casinhf): Consistently use float
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@ -1,4 +1,5 @@
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/* Copyright (C) 1993-2013 Free Software Foundation, Inc.
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/* Catastrophic failure reports. Generic POSIX.1 version.
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Copyright (C) 1993-2013 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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@ -27,6 +28,7 @@
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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/syslog.h>
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#include <sys/uio.h>
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#include <not-cancel.h>
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@ -35,6 +37,25 @@
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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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@ -42,7 +63,6 @@ struct str_list
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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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@ -121,8 +141,7 @@ __libc_message (int do_abort, const char *fmt, ...)
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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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written = WRITEV_FOR_FATAL (fd, iov, nlist, total);
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if (do_abort)
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{
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@ -131,7 +150,7 @@ __libc_message (int do_abort, const char *fmt, ...)
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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 (buf != MAP_FAILED)
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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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@ -158,8 +177,12 @@ __libc_message (int do_abort, const char *fmt, ...)
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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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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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@ -1,4 +1,5 @@
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/* Copyright (C) 1993-2013 Free Software Foundation, Inc.
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/* Catastrophic failure reports. Linux version.
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Copyright (C) 1993-2013 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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@ -15,195 +16,52 @@
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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/syslog.h>
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#include <execinfo.h>
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/* Abort with an error message. */
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#include <fcntl.h>
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#include <not-cancel.h>
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#include <sys/mman.h>
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#include <sys/uio.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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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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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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INTERNAL_SYSCALL_DECL (err);
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ssize_t cnt;
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do
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cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, niov);
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while (INTERNAL_SYSCALL_ERROR_P (cnt, err)
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&& INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR);
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return cnt == total;
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}
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#define WRITEV_FOR_FATAL writev_for_fatal
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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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static void
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backtrace_and_maps (int do_abort, bool written, int fd)
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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 = __libc_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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if (do_abort > 1 && written)
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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 = (void *) 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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INTERNAL_SYSCALL_DECL (err);
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ssize_t cnt;
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do
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cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, nlist);
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while (INTERNAL_SYSCALL_ERROR_P (cnt, err)
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&& INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR);
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if (cnt == total)
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written = true;
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if (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 (__builtin_expect (buf != MAP_FAILED, 1))
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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 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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{
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if (do_abort > 1 && written)
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{
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void *addrs[64];
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void *addrs[64];
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#define naddrs (sizeof (addrs) / sizeof (addrs[0]))
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int n = __backtrace (addrs, naddrs);
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if (n > 2)
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{
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int n = __backtrace (addrs, naddrs);
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if (n > 2)
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{
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#define strnsize(str) str, strlen (str)
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#define writestr(str) write_not_cancel (fd, str)
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writestr (strnsize ("======= Backtrace: =========\n"));
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__backtrace_symbols_fd (addrs + 1, n - 1, fd);
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writestr (strnsize ("======= Backtrace: =========\n"));
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__backtrace_symbols_fd (addrs + 1, n - 1, fd);
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writestr (strnsize ("======= Memory map: ========\n"));
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int fd2 = open_not_cancel_2 ("/proc/self/maps", O_RDONLY);
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char buf[1024];
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ssize_t n2;
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while ((n2 = read_not_cancel (fd2, buf, sizeof (buf))) > 0)
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if (write_not_cancel (fd, buf, n2) != n2)
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break;
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close_not_cancel_no_status (fd2);
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}
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}
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/* Terminate the process. */
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abort ();
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writestr (strnsize ("======= Memory map: ========\n"));
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int fd2 = open_not_cancel_2 ("/proc/self/maps", O_RDONLY);
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char buf[1024];
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ssize_t n2;
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while ((n2 = read_not_cancel (fd2, buf, sizeof (buf))) > 0)
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if (write_not_cancel (fd, buf, n2) != n2)
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break;
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close_not_cancel_no_status (fd2);
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}
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}
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}
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#define BEFORE_ABORT backtrace_and_maps
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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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#include <sysdeps/posix/libc_fatal.c>
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