Change exit() to _exit() in the child process. exit flushes stdio file buffers,

_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(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/misc/lvm-exec.c b/lib/misc/lvm-exec.c
index fffdc37f..d332aaa1 100644
--- a/lib/misc/lvm-exec.c
+++ b/lib/misc/lvm-exec.c
@@ -68,7 +68,7 @@ int exec_cmd(struct cmd_context *cmd, const char *const argv[])
 		/* FIXME Use execve directly */
 		execvp(argv[0], (char **const) argv);
 		log_sys_error("execvp", argv[0]);
-		exit(errno);
+		_exit(errno);
 	}
 
 	/* Parent */