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Man Pages
explain_system_or_die(3) FreeBSD Library Functions Manual explain_system_or_die(3)

explain_system_or_die - execute a shell command and report errors

#include <libexplain/system.h>
void explain_system_or_die(const char *command);
 
void explain_system_success_or_die(const char *command);
 
int explain_system_success(const char *command);

These functions may be used to execute commands via the system(3) function, and report the results.

void explain_system_or_die(const char *command);
The explain_system_or_die function is used to call the system(3) system call. On failure an explanation will be printed to stderr, obtained from explain_system(3), and then the process terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
int status = explain_system_or_die(command);
command
The command, exactly as to be passed to the system(3) system call.
Returns:
This function only returns on success, see system(3) for more information. On failure, prints an explanation and exits.

void explain_system_success_or_die(const char *command);
The explain_system_success_or_die function is used to call the system(3) system call. On failure, including any exit status other than EXIT_SUCCESS, an explanation will be printed to stderr, obtained from explain_system(3), and then the process terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
explain_system_success_or_die(command);
command
The command, exactly as to be passed to the system(3) system call.
Returns:
This function only returns on success. On failure, prints an explanation and exits.

int explain_system_success(const char *command);
The explain_system_success function is used to call the system(3) system call. On failure, including any exit status other than EXIT_SUCCESS, an explanation will be printed to stderr, obtained from explain_system(3). However, the priniting of an error message does not also cause exit(2) to be called.
This function is intended to be used in a fashion similar to the following example:
int status = explain_system_success(command);
command
The command, exactly as to be passed to the system(3) system call.
Returns:
the value returned by the system(3) system call. In all cases other than EXIT_SUCCESS, an error message will also have been printed to stderr.

system(3)
execute a shell command
explain_system(3)
explain system(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2008 Peter Miller

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