NAME

setpgid, setpgrp2 − set process group ID for job control

SYNOPSIS

#include <sys/types.h>

int setpgid(pid,pgid)
pid_t pid, pgid;

int setpgrp2(pid,pgid)
pid_t pid, pgid;

DESCRIPTION

Setpgid or setpgrp2 causes 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. 

ERRORS

Setpgid or setpgrp2 fails and no change occurs if any of the following are true:

[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. 

RETURN VALUE

Upon successful completion, setpgid or setpgrp2 returns zero.  Otherwise, a value of −1 is returned and errno is set to indicate the error. 

AUTHOR

Setpgid and setpgrp2 were developed by HP and the University of California, Berkeley. 

SEE ALSO

bsdproc(2), exec(2), exit(2), fork(2), getpid(2), kill(2), setsid(2), signal(2), termio(7). 

STANDARDS CONFORMANCE

setpgid: XPG3, POSIX.1, FIPS 151-1

setpgrp2: not applicable

Hewlett-Packard Company  —  HP-UX Release 7.0: Sept 1989