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+<TITLE>getpgrp</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>SETPGID(2) Linux Programmer's Manual SETPGID(2)
+</h3>
+
+<h3>NAME
+</h3> setpgid, getpgid, setpgrp, getpgrp - set/get process group
+
+<h3>SYNOPSIS
+</h3> #include &lt;unistd.h&gt;
+
+ int setpgid(pid_t pid, pid_t pgid);
+ pid_t getpgid(pid_t pid);
+ int setpgrp(void);
+ pid_t getpgrp(void);
+
+<h3>DESCRIPTION
+</h3> setpgid sets the process group ID of the process specified
+ by pid to pgid. If pid is zero, the process ID of the
+ current process is used. If pgid is zero, the process ID
+ of the process specified by pid is used.
+
+ getpgid returns the process group ID of the process speci-
+ fied by pid. If pid is zero, the process ID of the cur-
+ rent process is used.
+
+ In the Linux DLL 4.4.1 library, setpgrp simply calls
+ setpgid(0,0).
+
+ getpgrp is equivalent to getpgid(0).
+
+ Process groups are used for distribution of signals, and
+ by terminals to arbitrate requests for their input: pro-
+ cesses that have the same process group as the terminal
+ are foreground and may read, while others will block with
+ a signal if they attempt to read.
+
+ These calls are thus used by programs such as csh(1) to
+ create process groups in implementing job control. The
+ TIOCGPGRP and TIOCSPGRP calls described in termios(4) are
+ used to get/set the process group of the control terminal.
+
+<h3>RETURN VALUE
+</h3> On success, setpgid and setpgrp return zero. On error, -1
+ is returned, and errno is set appropriately.
+
+ getpgid returns a process group on success. On error, -1
+ is returned, and errno is set appropriately.
+
+ getpgrp always returns the current process group.
+
+<h3>ERRORS
+</h3> EINVAL pgid is less than 0.
+
+ EPERM Various permission violations.
+
+ ESRCH pid does not match any process.
+
+
+
+
+
+<h3>Linux 1.2.4 15 April 1995 1
+</h3>
+
+
+
+
+<h3>SETPGID(2) Linux Programmer's Manual SETPGID(2)
+</h3>
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=getuid.htm>getuid</a>,
+<a href=setsid.htm>setsid</a>,
+<a href=tcsetpgrp.htm>tcsetpgrp</a>,
+<a href=termios+4>termios</a>,
+<pre>
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+<h3>Linux 1.2.4 15 April 1995 2
+</h3>
+
+ </pre>
+<P>
+<hr>
+<p>
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