NAME
setpgid(), setpgrp2() — set process group ID for job control
SYNOPSIS
#include <unistd.h>
int setpgid(pid_t pid, pid_t pgid);
int setpgrp2(pid_t pid, pid_t pgid);
DESCRIPTION
The
setpgid()
and
setpgrp2()
system calls cause the process specified by
pid
to join an existing process group or create a new process group
within the session of the calling process.
The process group ID of the process whose process ID is
pid
is set to
pgid.
If
pid
is zero, the process ID of the calling process is used.
If
pgid
is zero, the process ID of the indicated process is used.
The process group ID of a session leader does not change.
setpgrp2()
is provided for backward compatibility only.
RETURN VALUE
setpgid()
and
setpgrp2()
return the following values:
- 0
Successful completion.
- -1
Failure.
errno
is set to indicate the error.
ERRORS
If
setpgid()
or
setpgrp2()
fails,
errno
is set to one of the following values.
- [EACCES]
The value of
pid
matches the process ID of a child process of the calling process
and the child process has successfully executed one of the
exec(2)
functions.
- [EINVAL]
The value of
pgid
is less than zero or is outside the range of valid process group ID values.
- [EPERM]
The process indicated by
pid
is a session leader.
- [EPERM]
The value of
pid
is valid but matches the process ID of a child process of the calling process,
and the child process is not in the same session as the calling process.
- [EPERM]
The value of
pgid
does not match the process ID of the process indicated by
pid
and there is no process with a process group ID that matches the value of
pgid
in the same session as the calling process.
- [ESRCH]
The value of
pid
does not match the process ID
of the calling process or of a child process of the calling process.
AUTHOR
setpgid()
and
setpgrp2()
were developed by HP and the University of California, Berkeley.
STANDARDS CONFORMANCE
setpgid(): AES, SVID3, XPG3, XPG4, FIPS 151-2, POSIX.1
