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1.1 ! root 1: .\" Copyright (c) 1980 Regents of the University of California. ! 2: .\" All rights reserved. The Berkeley software License Agreement ! 3: .\" specifies the terms and conditions for redistribution. ! 4: .\" ! 5: .\" @(#)exit.2 6.4 (Berkeley) 5/22/86 ! 6: .\" ! 7: .TH EXIT 2 "May 22, 1986" ! 8: .UC 4 ! 9: .SH NAME ! 10: _exit \- terminate a process ! 11: .SH SYNOPSIS ! 12: .nf ! 13: .ft B ! 14: _exit(status) ! 15: int status; ! 16: .fi ! 17: .SH DESCRIPTION ! 18: .I _exit ! 19: terminates a process with the following consequences: ! 20: .in +5n ! 21: .PP ! 22: All of the descriptors open in the calling process are closed. ! 23: This may entail delays, for example, waiting for output to drain; ! 24: a process in this state may not be killed, as it is already dying. ! 25: .PP ! 26: If the parent process of the calling process is executing a ! 27: .I wait ! 28: or is interested in the SIGCHLD signal, ! 29: then it is notified of the calling process's termination and ! 30: the low-order eight bits of \fIstatus\fP are made available to it; ! 31: see ! 32: .IR wait (2). ! 33: .PP ! 34: The parent process ID of all of the calling process's existing child ! 35: processes are also set to 1. This means that the initialization process ! 36: (see ! 37: .IR intro (2)) ! 38: inherits each of these processes as well. ! 39: Any stopped children are restarted with a hangup signal (SIGHUP). ! 40: .in -5n ! 41: .PP ! 42: Most C programs call the library routine ! 43: .IR exit (3), ! 44: which performs cleanup actions in the standard I/O library before ! 45: calling \fI_exit\fP\|. ! 46: .SH "RETURN VALUE" ! 47: This call never returns. ! 48: .SH "SEE ALSO" ! 49: fork(2), sigvec(2), wait(2), exit(3)
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