10-18-2006
Normally, the return status is decoded by the "wait" macros - WIFEXITED etc.
A lot of them work in pairs - if WIFEXITED returns a non-zero, then you use WIFEXITSTATUS to determine the exit status.
The problem with bit shifting is that you can't always determine if the child exited due to a signal like SIGSEGV-- because a signal can look like a weird exit status. And your core dump can go unnoticed.
man waitpid
has a nice explanation of exit status - and usually #include <stdlib.h>
has those macros in support support of the system() call -- which stdlib declares.
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LEARN ABOUT OSX
apache2::command
apache_mod_perl-108~358::mod_perl-2.0.7::docs::api::ApacUser:Contributed Peapache_mod_perl-108~358::mod_perl-2.0.7::docs::api::Apache2::Command(3)
NAME
Apache2::Command - Perl API for accessing Apache module command information
Synopsis
use Apache2::Module ();
use Apache2::Command ();
my $module = Apache2::Module::find_linked_module('mod_perl.c');
for (my $cmd = $module->cmds; $cmd; $cmd = $cmd->next) {
$cmd->args_how();
$cmd->errmsg();
$cmd->name();
$cmd->req_override();
}
Description
"Apache2::Command" provides the Perl API for accessing Apache module command information
API
"Apache2::Command" provides the following functions and/or methods:
"args_how"
What the command expects as arguments:
$how = $cmd->args_how();
obj: $cmd ( "Apache2::Command object" )
ret: $how ( "Apache2::Const :cmd_how constant" )
The flag value representing the type of this command (i.e. "Apache2::Const::ITERATE", "Apache2::Const::TAKE2").
since: 2.0.00
"errmsg"
Get usage message for that command, in case of syntax errors:
$error = $cmd->errmsg();
obj: $cmd ( "Apache2::Command object" )
ret: $error ( string )
The error message
since: 2.0.00
"name"
Get the name of this command:
$name = $cmd->name();
obj: $cmd ( "Apache2::Command object" )
ret: $name ( string )
The command name
since: 2.0.00
"next"
Get the next command in the chain of commands for this module:
$next = $cmd->next();
obj: $cmd ( "Apache2::Command object" )
ret: $next ( "Apache2::Command object" )
Returns the next command in the chain for this module, "undef" for the last command.
since: 2.0.00
"req_override"
What overrides need to be allowed to enable this command:
$override = $cmd->req_override
obj: $cmd ( "Apache2::Command object" )
ret: $override ( "Apache2::Const :override constant" )
The bit mask representing the overrides this command is allowed in (i.e "Apache2::Const::OR_ALL"/"Apache2::Const::ACCESS_CONF").
since: 2.0.00
For example:
use Apache2::Const -compile => qw(:override);
$cmd->req_override() & Apache2::Const::OR_AUTHCFG;
$cmd->req_override() & Apache2::Const::OR_LIMIT;
See Also
mod_perl 2.0 documentation.
Copyright
mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.
Authors
The mod_perl development team and numerous contributors.
perl v5.16.2 2011-02apache_mod_perl-108~358::mod_perl-2.0.7::docs::api::Apache2::Command(3)