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

explain_setgid_or_die - set group identity and report errors

#include <libexplain/setgid.h>
void explain_setgid_or_die(gid_t gid);
 
int explain_setgid_on_error(gid_t gid);

The explain_setgid_or_die function is used to call the setgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setgid(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_setgid_on_error function is used to call the setgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setgid(3) function, but still returns to the caller.
gid
The gid, exactly as to be passed to the setgid(2) system call.

The explain_setgid_or_die function only returns on success, see setgid(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_setgid_on_error function always returns the value return by the wrapped setgid(2) system call.

The explain_setgid_or_die function is intended to be used in a fashion similar to the following example:
explain_setgid_or_die(gid);

setgid(2)
set group identity
explain_setgid(3)
explain setgid(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2012 Peter Miller

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