terminate the calling process
() functions terminate a process with
the following consequences:
- All threads in the process are terminated.
- All open file descriptors in the calling process are closed. This may
entail delays; for example, waiting for output to drain. A process in this
state may not be killed, as it is already dying.
- If the parent process of the calling process has an outstanding
wait(2) call or catches the
SIGCHLD signal, it is notified of the
calling process's termination and status
is set as defined by wait(2).
(Note that typically only the lower 8 bits of
status are passed on to the parent, thus
negative values have less meaning.)
- The parent process ID of all of the calling process's existing child
processes are set to 1; the initialization process (see the DEFINITIONS
section of intro(2)) inherits
each of these processes.
- If the termination of the process causes any process group to become
orphaned (usually because the parents of all members of the group have now
exited; see Orphaned Process Group in
intro(2)), and if any member
of the orphaned group is stopped, the
SIGCONT signals are sent to all members
of the newly orphaned process group.
- If the process is a controlling process (see
SIGHUP signal is sent to the foreground
process group of the controlling terminal, and all current access to the
controlling terminal is revoked.
Most C programs call the library routine
, which flushes buffers,
closes streams, unlinks temporary files, etc., and then calls
() can never return.
() function conform to
IEEE Std 1003.1-2008
() function conforms to
() system call first appeared in
Version 1 AT&T UNIX
. It accepts the
Version 2 AT&T UNIX
() variant first appeared in
Version 7 AT&T UNIX
() function appeared in