vfork always fail problem
Matthias Andree
matthias.andree@gmx.de
Fri May 14 08:57:00 GMT 2010
Am 14.05.2010, 06:29 Uhr, schrieb Huang Bambo:
> [Bambo@bambo-notebook 4.4.4]$ cat tvfork.c
> #include <sys/types.h>
> #include <unistd.h>
> #include <stdio.h>
>
> int main(void)
> {
> pid_t pid = vfork();
> if ( pid > 0 )
> {
> printf("I'm chield.\n");
> _exit(0);
> }
> else if ( pid == 0 )
> {
> printf("I'm parent");
> }
You've got these swapped. pid == 0 means child, > 0 means parent (so that
it directly has the PID of its child and can later call waitpid()).
You later wrote you've issues with the path; does the same happen if you
use "fork" rather than "vfork"? vfork()ed child processes must not do
anything but modify a variable of type pid_t, call _exit() or exec*().
--
Matthias Andree
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