1SETPGRP(3P)                POSIX Programmer's Manual               SETPGRP(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       setpgrp — set the process group ID
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SYNOPSIS

16       #include <unistd.h>
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18       pid_t setpgrp(void);
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DESCRIPTION

21       If the calling process is not already a session leader, setpgrp()  sets
22       the  process  group  ID of the calling process to the process ID of the
23       calling process. If setpgrp() creates a new session, then the new  ses‐
24       sion has no controlling terminal.
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26       The setpgrp() function has no effect when the calling process is a ses‐
27       sion leader.
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RETURN VALUE

30       Upon completion, setpgrp() shall return the process group ID.
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ERRORS

33       No errors are defined.
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35       The following sections are informative.
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EXAMPLES

38       None.
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APPLICATION USAGE

41       It is unspecified whether this function behaves as setpgid(0,0) or set‐
42       sid() unless the process is already a session leader. Therefore, appli‐
43       cations are encouraged to use setpgid() or setsid() as appropriate.
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RATIONALE

46       None.
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FUTURE DIRECTIONS

49       The setpgrp() function may be removed in a future version.
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SEE ALSO

52       exec, fork(), getpid(), getsid(), kill(), setpgid(), setsid()
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54       The Base Definitions volume of POSIX.1‐2008, <unistd.h>
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57       Portions of this text are reprinted and reproduced in  electronic  form
58       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
59       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
60       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
61       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
62       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.unix.org/online.html .
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68       Any  typographical  or  formatting  errors that appear in this page are
69       most likely to have been introduced during the conversion of the source
70       files  to  man page format. To report such errors, see https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
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75IEEE/The Open Group                  2013                          SETPGRP(3P)
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