NAME
setpgid, setpgrp
— set process group
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
int
setpgid(pid_t
pid, pid_t
pgrp);
int
setpgrp(pid_t
pid, pid_t
pgrp);
DESCRIPTION
Setpgid()
sets the process group of the specified process pid to
the specified pgrp. If pid is
zero, then the call applies to the current process. If
pgrp is zero, then the process id of the process
specified by pid is used instead.
If the invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process.
RETURN VALUES
The setpgid() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
error.
COMPATIBILITY
Setpgrp() is identical to
setpgid(), and is retained for calling convention
compatibility with historical versions of BSD.
ERRORS
Setpgid() will fail and the process group
will not be altered 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(3) functions.
- [
EINVAL] - The value of the pgrp is not legal (less than zero).
- [
EPERM] - The effective user ID of the requested process is different from that of the caller and the process is not a descendant of 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.
SEE ALSO
STANDARDS
The setpgid() function call is expected to
conform to IEEE Std 1003.1-1990
(“POSIX.1”).