setpgid(), setpgrp2() - set process group ID for job control
int setpgid(pid_t pid, pid_t pgid);
int setpgrp2(pid_t pid, pid_t pgid);
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.
setpgid() and setpgrp2() return the following values:
0 Successful completion.
-1 Failure. errno is set to indicate the error.
If setpgid() or setpgrp2() fails, errno is set to one of the following
[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
[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
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
[ESRCH] The value of pid does not match the process ID of
the calling process or of a child process of the
setpgid() and setpgrp2() were developed by HP and the University of
bsdproc(3C), exec(2), exit(2), fork(2), getpid(2), kill(2), setsid(2),
setpgid(): AES, SVID3, XPG3, XPG4, FIPS 151-2, POSIX.1
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000