phoenix-rtos-doc / libc / functions / s / setpgid.part-impl.md

setpgid

Synopsis

#include <unistd.h>

int setpgid(pid_t pid, pid_t pgid);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

The setpgid() function shall either join an existing process group or create a new process group within the session of the calling process. The process group ID of a session leader shall not change. Upon successful completion, the process group ID of the process with a process ID that matches pid shall be set to pgid. As a special case, if pid is 1, the process ID of the calling process shall be used. Also, if pgid is 0, the process ID of the indicated process shall be used.

Return value

Upon successful completion, setpgid() shall return 0; otherwise, -1 shall be returned and errno shall be set to indicate the error.

Errors

The setpgid() function shall fail if:

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 one of the exec functions.
EINVAL - The value of the pgid argument is less than 0, or is not a value supported by the implementation.
EPERM - The process indicated by the pid argument is a session leader.
EPERM - 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.
EPERM - The value of the pgid argument is valid but 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 pgid argument in the same session as the calling process.
ESRCH - The value of the pid argument does not match the process ID of the calling process or of a child process of the calling process.

Tests

Untested

Known bugs

None