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Diffstat (limited to 'pod/perlvar.pod')
| -rw-r--r-- | pod/perlvar.pod | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/pod/perlvar.pod b/pod/perlvar.pod index f0447cd58f..23c110d34e 100644 --- a/pod/perlvar.pod +++ b/pod/perlvar.pod @@ -397,25 +397,20 @@ L<perlfunc/formline()>. =item $? The status returned by the last pipe close, back-tick (C<``>) command, -or system() operator. Note that this is the status word returned by the -wait() system call (or else is made up to look like it -- see L<$^S>). -Thus, the exit value of the subprocess is actually (C<$? E<gt>E<gt> 8>), -and C<$? & 255> gives which signal, if any, the process died from, and -whether there was a core dump. (Mnemonic: similar to B<sh> and B<ksh>.) +or system() operator. Note that this is the status word returned by +the wait() system call (or else is made up to look like it). Thus, +the exit value of the subprocess is actually (C<$? E<gt>E<gt> 8>), and +C<$? & 255> gives which signal, if any, the process died from, and +whether there was a core dump. (Mnemonic: similar to B<sh> and +B<ksh>.) Inside an C<END> subroutine C<$?> contains the value that is going to be given to C<exit()>. You can modify C<$?> in an C<END> subroutine to change the exit status of the script. -=item $SYSTEM_CHILD_STATUS - -=item $^S - -The status returned by the last pipe close, back-tick (C<``>) command, or -system() operator, in the native system format. On UNIX and UNIX-like -systems, C<$^S> is a synonym for C<$?>. Elsewhere, C<$^S> can be used to -determine aspects of child status that are system-specific. Check C<$^O> -before using this variable. (Mnemonic: System-Specific Subprocess Status.) +Under VMS, the pragma C<use vmsish 'status'> make C<$?> reflect the +actual VMS exit status, instead of the default emulation of POSIX +status. =item $OS_ERROR |