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

explain_setsid_or_die - sets process group ID and report errors

#include <libexplain/setsid.h>
pid_t explain_setsid_or_die(void);
 
pid_t explain_setsid_on_error(void);

The explain_setsid_or_die function is used to call the setsid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setsid(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_setsid_on_error function is used to call the setsid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setsid(3) function, but still returns to the caller.

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

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

setsid(2)
creates a session and sets the process group ID
explain_setsid(3)
explain setsid(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2011 Peter Miller

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