11-06-2008
Question about the system() function in C
Hello all !
Could someone throw some light on whether there's a limit to the number of characters contained in the command string that is passed to the system() call in C.
Is it OS dependent? If yes, what are the limits for each?
Thanks.
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LEARN ABOUT DEBIAN
explain_system_or_die
explain_system_or_die(3) Library Functions Manual explain_system_or_die(3)
NAME
explain_system_or_die - execute a shell command and report errors
SYNOPSIS
#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);
DESCRIPTION
These functions may be used to execute commands via the system(3) function, and report the results.
explain_system_or_die
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.
explain_system_success_or_die
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.
explain_system_success
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_SUC-
CESS, 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.
SEE ALSO
system(3)
execute a shell command
explain_system(3)
explain system(3) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2008 Peter Miller
explain_system_or_die(3)