HP-UX Reference (11i v1 00/12) - 2 System Calls (vol 5)

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setpgid(2) setpgid(2)

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 pro-

cess 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.Ifpid 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 pro-

cess of the calling process.

AUTHOR

setpgid() and setpgrp2() were developed by HP and the University of California, Berkeley.