NAME

       setpgid, setpgrp — set process group

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <unistd.h>

       int
       setpgid(pid_t pid, pid_t pgrp);

       int
       setpgrp(pid_t pid, pid_t pgrp);

DESCRIPTION

       The  setpgid() system call 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 affected process is not the invoking process, then it must be a child of the invoking process, it
       must not have performed an exec(3) operation, and both processes  must  be  in  the  same  session.   The
       requested  process  group  ID must already exist in the session of the caller, or it must be equal to the
       target process ID.

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

       The setpgrp() system call is identical to setpgid(), and is retained for calling convention compatibility
       with historical versions of BSD.

ERRORS

       The setpgid() system call will fail and the process group will not be altered if:

       [EINVAL]           The requested process group ID is not legal.

       [ESRCH]            The requested process does not exist.

       [ESRCH]            The target process is not the calling process or a child of the calling process.

       [EACCES]           The  requested  process  is  a  child  of the calling process, but it has performed an
                          exec(3) operation.

       [EPERM]            The target process is a session leader.

       [EPERM]            The requested process group ID is not in the session of the  caller,  and  it  is  not
                          equal to the process ID of the target process.

SEE ALSO

       getpgrp(2)

STANDARDS

       The setpgid() system call is expected to conform to ISO/IEC 9945-1:1990 (“POSIX.1”).

Debian                                          February 8, 2004                                      SETPGID(2)