table of contents
| explain_getpgid_or_die(3) | Library Functions Manual | explain_getpgid_or_die(3) |
NAME¶
explain_getpgid_or_die - get process group and report errorsSYNOPSIS¶
#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 1.4Copyright (C) 2011 Peter Miller