explain_getpgid_or_die(3) [debian man page]
explain_getpgid_or_die(3) Library Functions Manual explain_getpgid_or_die(3) NAME
explain_getpgid_or_die - get process group and report errors SYNOPSIS
#include <libexplain/getpgid.h> pid_t explain_getpgid_or_die(pid_t pid); pid_t explain_getpgid_on_error(pid_t pid); DESCRIPTION
The explain_getpgid_or_die function is used to call the getpgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_getpgid(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_getpgid_on_error function is used to call the getpgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_getpgid(3) function, but still returns to the caller. pid The pid, exactly as to be passed to the getpgid(2) system call. RETURN VALUE
The explain_getpgid_or_die function only returns on success, see getpgid(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_getpgid_on_error function always returns the value return by the wrapped getpgid(2) system call. EXAMPLE
The explain_getpgid_or_die function is intended to be used in a fashion similar to the following example: pid_t result = explain_getpgid_or_die(pid); SEE ALSO
getpgid(2) get process group explain_getpgid(3) explain getpgid(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2011 Peter Miller explain_getpgid_or_die(3)
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explain_setpgrp_or_die(3) Library Functions Manual explain_setpgrp_or_die(3) NAME
explain_setpgrp_or_die - set process group and report errors SYNOPSIS
#include <libexplain/setpgrp.h> void explain_setpgrp_or_die(pid_t pid, pid_t pgid); int explain_setpgrp_on_error(pid_t pid, pid_t pgid); DESCRIPTION
The explain_setpgrp_or_die function is used to call the setpgrp(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setpgrp(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_setpgrp_on_error function is used to call the setpgrp(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setpgrp(3) function, but still returns to the caller. pid The pid, exactly as to be passed to the setpgrp(2) system call. pgid The pgid, exactly as to be passed to the setpgrp(2) system call. Note: the setpgrp(2) function has two implementations. The System V version has no arguments, while the BSD version has two arguments. For simplicity of implementation, the argument list seen here includes the pid and pgid arguments. The System V getpgid() semantics can be obtained by calling setpgrp(0, 0) on systems with the BSD version, and this is the API for libex- plain, even on systems that do not use the BSD API. RETURN VALUE
The explain_setpgrp_or_die function only returns on success, see setpgrp(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_setpgrp_on_error function always returns the value return by the wrapped setpgrp(2) system call. EXAMPLE
The explain_setpgrp_or_die function is intended to be used in a fashion similar to the following example: explain_setpgrp_or_die(pid, pgid); SEE ALSO
setpgrp(2) set process group explain_setpgrp(3) explain setpgrp(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2011 Peter Miller explain_setpgrp_or_die(3)