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+.\" Copyright (c) 1980, 1991, 1993
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+.\"
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+.\"
+.Dd February 8, 2004
+.Dt SETPGID 2
+.Os
+.Sh NAME
+.Nm setpgid ,
+.Nm setpgrp
+.Nd set process group
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn setpgid "pid_t pid" "pid_t pgrp"
+.Ft int
+.Fn setpgrp "pid_t pid" "pid_t pgrp"
+.Sh DESCRIPTION
+The
+.Fn setpgid
+system call
+sets the process group of the specified process
+.Fa pid
+to the specified
+.Fa pgrp .
+If
+.Fa pid
+is zero, then the call applies to the current process.
+If
+.Fa pgrp
+is zero, then the process id of the process specified by
+.Fa pid
+is used instead.
+.Pp
+If the affected process is not the invoking process, then it must be a
+child of the invoking process, it must not have performed an
+.Xr exec 3
+operation, and both processes must be in the same session.
+The requested process group ID must already exist in the session of
+the caller, or it must be equal to the target process ID.
+.Sh RETURN VALUES
+.Rv -std setpgid
+.Sh COMPATIBILITY
+The
+.Fn setpgrp
+system call
+is identical to
+.Fn setpgid ,
+and is retained for calling convention compatibility with historical
+versions of
+.Bx .
+.Sh ERRORS
+The
+.Fn setpgid
+system call
+will fail and the process group will not be altered if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The requested process group ID is not legal.
+.It Bq Er ESRCH
+The requested process does not exist.
+.It Bq Er ESRCH
+The target process is not the calling process or
+a child of the calling process.
+.It Bq Er EACCES
+The requested process is a child of the calling process,
+but it has performed an
+.Xr exec 3
+operation.
+.It Bq Er EPERM
+The target process is a session leader.
+.It Bq Er EPERM
+The requested process group ID is not in the session of the caller,
+and it is not equal to the process ID of the target process.
+.El
+.Sh SEE ALSO
+.Xr getpgrp 2
+.Sh STANDARDS
+The
+.Fn setpgid
+system call is expected to conform to
+.St -p1003.1-90 .