setpgid(2) manual page
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setpgid - set process group ID
#include <sys/types.h>
#include <unistd.h>
int setpgid(pid_t pid, pid_t pgid);
Async-Signal-Safe
setpgid() sets the process group ID
of the process with ID
pid to pgid.
If pgid is equal to pid, the process becomes a process group leader. See
intro(2)
for more information on session leaders and process group leaders.
If pgid is not equal to pid, the process becomes a member of an existing
process group.
If pid is equal to 0, the process ID
of the calling process
is used. If pgid is equal to 0, the process specified by pid becomes a process
group leader.
Upon successful completion, setpgid() returns
a value of 0. Otherwise, a value of -1 is returned and errno is set to indicate
the error.
setpgid() fails and returns an error if one or more of
the following are true:
- EACCES
- pid matches the process ID
of a child process
of the calling process and the child process has successfully executed
an exec(2)
function.
- EINVAL
- pgid is less than (pid_t) 0, or greater than
or equal to {PID_MAX}.
- EINVAL
- The calling process has a controlling terminal
that does not support job control.
- EPERM
- The process indicated by the pid
argument is a session leader.
- EPERM
- pid 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
- pgid 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 pgid in the same session as the calling
process.
- ESRCH
- pid does not match the process ID
of the calling process
or of a child process of the calling process.
intro(2)
, exec(2)
,
exit(2)
, fork(2)
, getpid(2)
, getsid(2)
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