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Add notes about queued SIGCHLD.

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This commit is contained in:
David Xu 2005-11-11 05:30:48 +00:00
parent e84ece6bef
commit 4c1a973e6e
1 changed files with 10 additions and 0 deletions
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10
lib/libc/sys/wait.2
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@ -233,6 +233,16 @@ depending on the options in effect for the signal;
see
.Xr intro 2 ,
System call restart.
.Pp
The implementation queues one SIGCHLD signal for each child process whose
status has changed, if wait() or waitpid() returns because the status of
a child process is available, the pending SIGCHLD signal associated with
the process ID of the child process will be discarded.
Any other pending SIGCHLD signals remain pending.
.Pp
If SIGCHLD is blocked, if wait() or waitpid() return because the
status of a child process is available, the pending SIGCHLD signal will be
cleared unless another status of the child process is available.
.Sh RETURN VALUES
If
.Fn wait