/*
Copyright (C) 2012 RedHat inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "libabrt.h"
/* I want to use -Werror, but gcc-4.4 throws a curveball:
* "warning: ignoring return value of 'ftruncate', declared with attribute warn_unused_result"
* and (void) cast is not enough to shut it up! Oh God...
*/
#define IGNORE_RESULT(func_call) do { if (func_call) /* nothing */; } while (0)
int check_recent_crash_file(const char *filename, const char *executable)
{
int fd = open(filename, O_RDWR | O_CREAT, 0600);
if (fd < 0)
return 0;
int ex_len = strlen(executable);
struct stat sb;
int sz;
fstat(fd, &sb); /* !paranoia. this can't fail. */
if (sb.st_size != 0 /* if it wasn't created by us just now... */
&& (unsigned)(time(NULL) - sb.st_mtime) < 20 /* and is relatively new [is 20 sec ok?] */
) {
char buf[ex_len + 2];
sz = read(fd, buf, ex_len + 1);
if (sz > 0)
{
buf[sz] = '\0';
if (strcmp(executable, buf) == 0)
{
close(fd);
return 1;
}
}
lseek(fd, 0, SEEK_SET);
}
sz = write(fd, executable, ex_len);
if (sz >= 0)
IGNORE_RESULT(ftruncate(fd, sz));
close(fd);
return 0;
}