setpgid(3)setpgid(3)Namesetpgid - set process group (POSIX)
Syntax
#include <sys/types.h>
int
setpgid(pid, pgrp)
pid_t pid, pgrp;
Description
The function is used to either join an existing process group or create
a new process group within the session of the calling process (see Upon
successful completion, the process group ID of the process that has a
process ID which matches pid is set to pgrp. If pid is zero, then the
call applies to the current process. In addition, if pgrp is zero, the
process ID of the indicated process is used.
This function is available only in the POSIX environment.
Return Values
The function returns 0 when the operation is successful. If the
request fails, -1 is returned and the global variable indicates the
reason.
Diagnostics
The function fails and the process group is not altered if one of the
following occurs:
[EACCES] The value of the pid argument matches the process ID of
a child process of the calling process and the child
process has successfully executed an function.
[EINVAL] The value of the pgrp argument is less than zero or is
not a supported value.
[EPERM] The process indicated by the pid argument is a session
leader.
The value of the pid argument 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.
The value of the pgrp argument does not match the
process ID of the process indicated by the pid argument
and there is no process with a process group ID that
matches the value of the pgrp argument in the same ses‐
sion as the calling process.
[ESRCH] The value of the pid argument does not match the process
ID of the calling process of a child process of the
calling process.
See Alsogetpgrp(2), setsid(2)setpgid(3)
