postnote(2) [plan9 man page]

POSTNOTE(2)							System Calls Manual						       POSTNOTE(2)

NAME

       postnote - send a note to a process or process group

SYNOPSIS

       #include <u.h>
       #include <libc.h>

       int  postnote(int who, int pid, char *note)

DESCRIPTION

       Postnote  sends	a  note  to a process or process group.  If who is PNPROC, then note is written to /proc/pid/note.  If who is PNGROUP, the
       note is delivered to the process group by writing note to /proc/pid/notepg.  For PNGROUP only, if the calling  process  is  in  the  target
       group, the note is not delivered to that process.

       If the write is successful, zero is returned.  Otherwise -1 is returned.

SOURCE

       /sys/src/libc/9sys/postnote.c

SEE ALSO

       notify(2), intro(2), proc(3)

DIAGNOSTICS

       Sets errstr.

																       POSTNOTE(2)

setpgid(2)							   System Calls 							setpgid(2)

NAME

       setpgid - set process group ID

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       int setpgid(pid_t pid, pid_t pgid);

DESCRIPTION

       The setpgid() function 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.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The setpgid() function will fail if:

       EACCES	 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 family of functions (see exec(2)).

       EINVAL	 The pgid argument is less than (pid_t) 0 or greater than or equal to PID_MAX, or 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	 The  pid  argument matches the process ID of a child process of the calling process and the child process is not in the same ses-
		 sion as the calling process.

       EPERM	 The pgid argument 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	 The pid argument does not match the process ID of the calling process or of a child process of the calling process.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(2), exec(2), exit(2), fork(2), getpid(2), getsid(2), attributes(5), standards(5)

SunOS 5.11							    28 Dec 1996 							setpgid(2)