— terminate the calling
Standard C Library (libc, -lc)
() system call terminates a process with the
- All of the descriptors open 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 the status is set as
defined by wait(2).
- The parent process-ID of all of the calling process's
existing child processes are set to 1; the initialization process inherits
each of these processes (see init(8) and the
DEFINITIONS section of
- 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
SIGHUP signal and the
SIGCONT signal 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 exit(3)
flushes buffers, closes streams, unlinks temporary files, etc., before calling
() system call can never return.
() system call is expected to conform to
IEEE Std 1003.1-1990 (“POSIX.1”)
() function appeared in
Version 7 AT&T UNIX