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SubjectRe: [HELP]Problem with exit(0) and _exit(0) on RHEL x86
Li Xiaodong wrote:
> I thought the effects of exit(0) and _exit(0) should be different.
>
> ----
> int main(void)
> {
> int var = 0;
> pid_t pid;
>
> printf("before vfork\n");
> if ( (pid = vfork()) < 0 )
> printf("error\n");
> else if ( pid == 0 )
> {
> var++;
> exit(0); /* Clear parent's IO */
> }
>
> printf("%d\n",var);
> return 0;
> }
>
> ----
>
> int main(void)
> {
> int var = 0;
> pid_t pid;
>
> printf("before vfork\n");
> if ( (pid = vfork()) < 0 )
> printf("error\n");
> else if ( pid == 0 )
> {
> var++;
> _exit(0); /* Do not clear parent's IO */
> }
>
> printf("%d\n",var);
> return 0;
> }
>
> ----
>
> But the actual results on RHEL5 x86 were beyond my ken. The outputs of the
> above two are the same.
>
> $./a.out
> before vfork
> 1
>
> Could anyone help me with this? Thanks.

Why do you expect a different result? Also, calling exit from a vforked
child is explicitly not allowed. The only things you can do are execve
or _exit.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/



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