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.\" ========================================================================
.\"
.IX Title "WaitStat 3pm"
.TH WaitStat 3pm "1999-10-27" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Proc::WaitStat \- Interpret and act on wait() status values
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&    $description = waitstat $?;
\&    exit waitstat_reuse $?;
\&    waitstat_die $?, 'program\-name';
\&    close_die COMMAND, 'program\-name';
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module contains functions for interpreting and acting on wait
status values.
.PP
Nothing is exported by default.
.IP "\fBwaitstat\fR \fIwait-status\fR" 4
.IX Item "waitstat wait-status"
Returns a string representation of \fIwait()\fR status value \fIwait-status\fR.
Values returned are like \f(CW"0"\fR and \f(CW"64"\fR and \f(CW"killed (SIGHUP)"\fR.
.Sp
This function is prototyped to take a single scalar argument.
.IP "\fBwaitstat_reuse\fR \fIwait-status\fR" 4
.IX Item "waitstat_reuse wait-status"
Turn \fIwait-status\fR into a value which can be passed to \fBexit\fR, converted
in the same manner the shell uses.  If \fIwait-status\fR indicates a normal
exit, return the exit value.  If \fIwait-status\fR instead indicates death by
signal, return 128 plus the signal number.
.Sp
This function is prototyped to take a single scalar argument.
.IP "\fBwaitstat_die\fR \fIwait-status\fR \fIprogram-name\fR" 4
.IX Item "waitstat_die wait-status program-name"
\&\fIdie()\fR if \fIwait-status\fR is non-zero (mentioning \fIprogram-name\fR as the
source of the error).
.Sp
This function is prototyped to take two scalar arguments.
.IP "\fBclose_die\fR \fIfilehandle\fR \fIname\fR" 4
.IX Item "close_die filehandle name"
Close \fIfilehandle\fR, if that fails \fIdie()\fR with an appropriate message
which refers to \fIname\fR.  This handles failed closings of both programs
and files properly.
.Sp
This function is prototyped to take a filehandle (actually, a glob ref)
and a scalar.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 4
\&    close SENDMAIL;
\&    exit if $? == 0;
\&    log "sendmail failure: ", waitstat $?;
\&    exit EX_TEMPFAIL;
.Ve
.PP
.Vb 2
\&    $pid == waitpid $pid, 0 or croak "Failed to reap $pid: $!";
\&    exit waitstat_reuse $?;
.Ve
.PP
.Vb 3
\&    $output = `some\-program \-with args`;
\&    waitstat_die $?, 'some\-program';
\&    print "Output from some\-process:\en", $output;
.Ve
.PP
.Vb 8
\&    open PROGRAM, '| post\-processor' or die "Can't fork: $!";
\&    while (<IN>) {
\&        print PROGRAM pre_process $_
\&            or die "Error writing to post\-processor: $!";
\&    }
\&    # This handles both flush failures at close time and a non\-zero exit
\&    # from the subprocess.
\&    close_die PROGRAM, 'post\-processor';
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Roderick Schertler <\fIroderick@argon.org\fR>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIperl\fR\|(1), \fIIPC::Signal\fR\|(3pm).