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Top Forums Programming How to get system() function executed cmd return value ? Post 302093267 by jim mcnamara on Wednesday 18th of October 2006 09:48:39 AM
Old 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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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)
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