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
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