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 libexplain, 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 1.4
       Copyright (C) 2011 Peter Miller

                                                                        explain_setpgrp_or_die(3)