Messages in this thread | | | Date | Thu, 04 Dec 2003 15:51:09 +0530 | From | Raj <> | Subject | Re: system() return different value under 2.4.23 and 2.6.0-test11 |
| |
fengxj wrote:
>----------------------------- >#include <stdio.h> >#include <stdlib.h> >#include <signal.h> > >int main(void) >{ > int ret; > > signal(SIGCHLD, SIG_IGN); > > ret = system("/bin/date 1>/dev/null"); > printf("%d\n", ret); > > return 0; >} >---------------------------- > >runs under 2.4.23 with ret = 0, >but under 2.6.0-test11, ret = -1. > >Why? > >And when i remove > signal(...) >it returns the same value 0. > >
It's happening because of the return values of wait4(). wait4() is returning -1 in test11 whene SIGCHLD is SIG_IGN'ed. /Raj
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |