getpgid
Synopsis
#include <unistd.h>
pid_t getpgid(pid_t pid);
Status
Partially implemented
Conformance
IEEE Std 1003.1-2017
Description
The getpgid() function shall return the process group ID of the process whose process ID is equal to pid. If pid
is equal to 0, getpgid() shall return the process group ID of the calling process.
Return value
Upon successful completion, getpgid() shall return a process group ID. Otherwise, it shall return (pid_t)-1 and set
errno to indicate the error.
Errors
The getpgid() function shall fail if:
-
EPERM- The process whose process ID is equal to pid is not in the same session as the calling process, and the implementation does not allow access to the process group ID of that process from the calling process. -
ESRCH- There is no process with a process ID equal to pid.
The getpgid() function may fail if:
EINVAL- The value of the pid argument is invalid.
Tests
Untested
Known bugs
None