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git://sourceware.org/git/lvm2.git
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3395d72881
_exit doesn't. If there were some open files, an error in exec and subsequent
exit() would cause the buffers to be flushed twice.
Example:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
int main()
{
printf("buu");
if (!fork()) {
execl("/bin/true-not-exists", "/bin/true", NULL);
exit(1);
}
wait(NULL);
return 0;
}
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com
---
daemons/dmeventd/libdevmapper-event.c | 2 +-
lib/misc/lvm-exec.c | 2 +-
test/harness.c | 3 ++-
tools/dmsetup.c | 2 +-
4 files changed, 5 insertions(+), 4 deletions(-)
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "device.h"
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#include "locking.h"
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#include "lvm-exec.h"
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#include "toolcontext.h"
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#include <unistd.h>
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#include <sys/wait.h>
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/*
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* Create verbose string with list of parameters
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*/
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static char *_verbose_args(const char *const argv[], char *buf, size_t sz)
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{
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int pos = 0;
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int len;
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unsigned i;
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buf[0] = '\0';
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for (i = 0; argv[i]; i++) {
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if ((len = dm_snprintf(buf + pos, sz - pos,
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"%s ", argv[i])) < 0)
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/* Truncated */
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break;
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pos += len;
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}
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return buf;
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}
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/*
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* Execute and wait for external command
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*/
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int exec_cmd(struct cmd_context *cmd, const char *const argv[])
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{
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pid_t pid;
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int status;
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char buf[PATH_MAX * 2];
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log_verbose("Executing: %s", _verbose_args(argv, buf, sizeof(buf)));
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if ((pid = fork()) == -1) {
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log_error("fork failed: %s", strerror(errno));
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return 0;
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}
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if (!pid) {
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/* Child */
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reset_locking();
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dev_close_all();
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/* FIXME Fix effect of reset_locking on cache then include this */
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/* destroy_toolcontext(cmd); */
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/* FIXME Use execve directly */
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execvp(argv[0], (char **const) argv);
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log_sys_error("execvp", argv[0]);
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_exit(errno);
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}
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/* Parent */
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if (wait4(pid, &status, 0, NULL) != pid) {
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log_error("wait4 child process %u failed: %s", pid,
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strerror(errno));
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return 0;
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}
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if (!WIFEXITED(status)) {
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log_error("Child %u exited abnormally", pid);
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return 0;
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}
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if (WEXITSTATUS(status)) {
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log_error("%s failed: %u", argv[0], WEXITSTATUS(status));
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return 0;
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}
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return 1;
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}
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