_exit

Terminates a process.

Syntax

   #include <unistd.h>

   void _exit (int status);

Parameters

status: A status code to be made available to the parent process of the calling process through the wait() or waitpid() functions.

Return Values

None. This function does not return to the calling process.

Description

The _exit() function terminates the calling process. The following actions are performed:

The calling process is terminated.
All open files and directory streams in the calling process are closed.
The low-order 8 bits of the status parameter are saved and made available to the parent process through the wait() or waitpid() functions.
All child processes of the calling process are terminated.
A SIGCHLD signal is sent to the parent process to notify it of the calling process's termination.

Implementation Considerations

All child processes of the calling process are terminated. They are not adopted by a system process.

The CI session variable CJCW is set to status.

Time accounting information of the calling process is not made available to the parent process through the wait() or waitpid() functions. A zero is always returned.

No user process can be a controlling process. Only system processes (CI processes) are allowed to be controlling processes.

The controlling terminal is not disassociated from the session of the calling process.

Errors

None.

_exit

Technical documentation

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