'\" te
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.TH setpgid 2 "28 Dec 1996" "SunOS 5.11" "System Calls"
.SH NAME
setpgid \- set process group ID
.SH SYNOPSIS
.LP
.nf
#include <sys/types.h>
#include <unistd.h>

\fBint\fR \fBsetpgid\fR(\fBpid_t\fR \fIpid\fR, \fBpid_t\fR \fIpgid\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBsetpgid()\fR function sets the process group \fBID\fR of the process
with \fBID\fR \fIpid\fR to \fIpgid\fR.
.sp
.LP
If \fIpgid\fR is equal to \fIpid\fR, the process becomes a process group
leader. See \fBIntro\fR(2) for more information on session leaders and process
group leaders.
.sp
.LP
If \fIpgid\fR is not equal to \fIpid\fR, the process becomes a member of an
existing process group.
.sp
.LP
If \fIpid\fR is equal to 0, the process \fBID\fR of the calling process is
used. If \fIpgid\fR is equal to 0, the process specified by \fIpid\fR becomes a
process group leader.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
returned and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBsetpgid()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEACCES\fR\fR
.ad
.RS 10n
.rt  
The \fIpid\fR argument matches the process \fBID\fR of a child process of the
calling process and the child process has successfully executed  one of the
\fIexec\fR family of functions (see \fBexec\fR(2)).
.RE

.sp
.ne 2
.mk
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
.rt  
The \fIpgid\fR argument is less than (\fBpid_t) 0\fR or greater than or equal
to \fBPID_MAX\fR, or the calling process has a controlling terminal that does
not support job control.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEPERM\fR\fR
.ad
.RS 10n
.rt  
The process indicated by the \fIpid\fR argument is a session leader.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEPERM\fR\fR
.ad
.RS 10n
.rt  
The \fIpid\fR argument matches the process \fBID\fR of a child process of the
calling process and the child process is not in the same session as the calling
process.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEPERM\fR\fR
.ad
.RS 10n
.rt  
The \fIpgid\fR argument does not match the process \fBID\fR of the process
indicated by the \fIpid\fR argument, and there is no process with a process
group \fBID\fR that matches \fIpgid\fR in the same session as the calling
process.
.RE

.sp
.ne 2
.mk
.na
\fB\fBESRCH\fR\fR
.ad
.RS 10n
.rt  
The \fIpid\fR argument does not match the process \fBID\fR of the calling
process or of a child process of the calling process.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityStandard
_
MT-LevelAsync-Signal-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBIntro\fR(2), \fBexec\fR(2), \fBexit\fR(2), \fBfork\fR(2), \fBgetpid\fR(2),
\fBgetsid\fR(2), \fBattributes\fR(5), \fBstandards\fR(5)