On Thursday 26 May 2005 20:37, Parag Warudkar wrote:
With WCONTINUED - there is no waitid in the strace output -
> clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
> child_tidptr=0x2aaaaade7b70) = 7683
> child (PID = 7683) started
> rt_sigaction(SIGUSR1, {0x400aa0, [], SA_RESTORER|SA_RESTART,
> 0x2aaaaabefca0}, NULL, 8) = 0
> clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
> child_tidptr=0x2aaaaade7b70) = 7684
> write(1, "Error Code from waitid - -1\n", 28Error Code from waitid - -1
> ) = 28
Without WCONTINUED -
>clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x2aaaaade7b70) = 7898
>child (PID = 7898) started
>rt_sigaction(SIGUSR1, {0x400aa0, [], SA_RESTORER|SA_RESTART, 0x2aaaaabefca0},
>NULL, 8) = 0
>clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x2aaaaade7b70) = 7899
>wait4(7898, Sending signal to parent
>0x7fffffffeecc, WSTOPPED, NULL) = ? ERESTARTSYS (To be restarted)
>--- SIGUSR1 (User defined signal 1) @ 0 (0) ---
>--- SIGCHLD (Child exited) @ 0 (0) ---
>write(1, "Caught signal", 13Caught signal) = 13
>write(1, "\n", 1
>) = 1
>rt_sigreturn(0x1) = 61
It's of course beyond me why this difference - strace output should have had
mention of wait4(...) = ENOTSUP (or whatever) when WCONTINUED is used.
WCONTINUED is declared in include files and mentioned as supported in the man
pages.
Parag
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