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Preserve message printed before abort.
The terminal output etc is not visible in a core file. The new libc-internal variable __abort_msg will point to a string with the message which has been printed before the abort in case abort is called from inside libc. BZ #10217
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ChangeLog
11
ChangeLog
@ -1,5 +1,16 @@
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2009-06-15 Ulrich Drepper <drepper@redhat.com>
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[BZ #10217]
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* stdlib/abort.c: Define variable __abort_msg.
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* stdlib/Versions: Export __abort_msg with GLIBC_PRIVATE version.
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* include/stdlib.h: Declare __abort_msg.
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* assert/assert-perr.c: Don't free buffer for message immediately.
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Store atomically in __abort_msg and free old buffer if necessary.
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* assert/assert.c: Likewise.
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* sysdeps/posix/libc_fatal.c: Allocate buffer for message, copy it,
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store pointer in __abort_msg, and possibly free old string.
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* sysdeps/unix/sysv/linux/libc_fatal.c: Likewise.
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* time/tzfile.c (__tzfile_read): Correct computation of tzspec_len.
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[BZ #10211]
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@ -1,4 +1,4 @@
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/* Copyright (C) 1994-1998,2001,2002,2005 Free Software Foundation, Inc.
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/* Copyright (C) 1994-1998,2001,2002,2005,2009 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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@ -17,6 +17,7 @@
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02111-1307 USA. */
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#include <assert.h>
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#include <atomic.h>
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#include <libintl.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -64,9 +65,10 @@ __assert_perror_fail (int errnum,
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(void) __fxprintf (NULL, "%s", buf);
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(void) fflush (stderr);
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/* We have to free the buffer since the appplication might catch the
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SIGABRT. */
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free (buf);
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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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char *old = atomic_exchange_acq (&__abort_msg, buf);
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free (old);
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}
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else
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{
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@ -1,4 +1,4 @@
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/* Copyright (C) 1991,1994-1996,1998,2001,2002,2005
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/* Copyright (C) 1991,1994-1996,1998,2001,2002,2005,2009
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -18,6 +18,7 @@
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02111-1307 USA. */
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#include <assert.h>
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#include <atomic.h>
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#include <libintl.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -43,6 +44,7 @@ extern const char *__progname;
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# include FATAL_PREPARE_INCLUDE
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#endif
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#undef __assert_fail
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void
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__assert_fail (const char *assertion, const char *file, unsigned int line,
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@ -64,9 +66,10 @@ __assert_fail (const char *assertion, const char *file, unsigned int line,
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(void) __fxprintf (NULL, "%s", buf);
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(void) fflush (stderr);
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/* We have to free the buffer since the application might catch the
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SIGABRT. */
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free (buf);
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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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char *old = atomic_exchange_acq (&__abort_msg, buf);
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free (old);
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}
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else
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{
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@ -221,6 +221,9 @@ extern int __qfcvt_r (long double __value, int __ndigit,
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extern void *__default_morecore (ptrdiff_t) __THROW;
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libc_hidden_proto (__default_morecore)
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extern char *__abort_msg;
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libc_hidden_proto (__abort_msg)
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__END_DECLS
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#undef __Need_M_And_C
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@ -104,5 +104,7 @@ libc {
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# functions which have an additional interface since they are
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# are cancelable.
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__libc_system;
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# Variable which needs a dynamic symbol table entry.
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__abort_msg;
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}
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}
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@ -1,4 +1,4 @@
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/* Copyright (C) 1991,93,95,96,97,98,2001,02 Free Software Foundation, Inc.
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/* Copyright (C) 1991,93,1995-1998,2001,02,2009 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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@ -36,6 +36,10 @@
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# define fflush(s) _IO_flush_all_lockp (0)
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#endif
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/* Exported variable to locate abort message in core files etc. */
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char *__abort_msg __attribute__ ((nocommon));
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libc_hidden_def (__abort_msg)
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/* We must avoid to run in circles. Therefore we remember how far we
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already got. */
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static int stage;
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@ -1,4 +1,4 @@
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/* Copyright (C) 1993,1994,1995,1997,2000,2004,2005
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/* Copyright (C) 1993-1995,1997,2000,2004,2005,2009
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -17,6 +17,7 @@
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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 <atomic.h>
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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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@ -123,6 +124,20 @@ __libc_message (int do_abort, const char *fmt, ...)
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if (TEMP_FAILURE_RETRY (__writev (fd, iov, nlist)) == total)
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written = true;
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char *buf = do_abort ? malloc (total + 1) : NULL;
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if (buf != NULL)
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{
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char *wp = buf;
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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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char *old = atomic_exchange_acq (&__abort_msg, buf);
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free (old);
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}
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}
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va_end (ap);
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@ -1,4 +1,5 @@
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/* Copyright (C) 1993-1995,1997,2000,2002-2005 Free Software Foundation, Inc.
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/* Copyright (C) 1993-1995,1997,2000,2002-2005,2009
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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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@ -16,6 +17,7 @@
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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 <atomic.h>
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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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@ -131,6 +133,20 @@ __libc_message (int do_abort, const char *fmt, ...)
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if (cnt == total)
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written = true;
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char *buf = do_abort ? malloc (total + 1) : NULL;
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if (buf != NULL)
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{
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char *wp = buf;
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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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char *old = atomic_exchange_acq (&__abort_msg, buf);
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free (old);
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}
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}
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va_end (ap);
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