NAME
getpgrp - get the process group ID of the calling process
SYNOPSIS
#include <unistd.h>
pid_t getpgrp(void);
DESCRIPTION
The getpgrp() function shall return the process group ID of the calling
process.
RETURN VALUE
The getpgrp() function shall always be successful and no return value
is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
4.3 BSD provides a getpgrp() function that returns the process group ID
for a specified process. Although this function supports job control,
all known job control shells always specify the calling process with
this function. Thus, the simpler System V getpgrp() suffices, and the
added complexity of the 4.3 BSD getpgrp() is provided by the XSI
extension getpgid().
FUTURE DIRECTIONS
None.
SEE ALSO
exec() , fork() , getpgid() , getpid() , getppid() , kill() , setpgid()
, setsid() , the Base Definitions volume of IEEE Std 1003.1-2001,
<sys/types.h>, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .