sleep.c

来自「一个C源代码分析器」· C语言 代码 · 共 38 行

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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.This file is part of the GNU C Library.The GNU C Library is free software; you can redistribute it and/ormodify it under the terms of the GNU Library General Public License aspublished by the Free Software Foundation; either version 2 of theLicense, or (at your option) any later version.The GNU C Library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULibrary General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with the GNU C Library; see the file COPYING.LIB.  Ifnot, write to the Free Software Foundation, Inc., 675 Mass Ave,Cambridge, MA 02139, USA.  */#include <ansidecl.h>#include <signal.h>#include <time.h>#include <unistd.h>#include <errno.h>/* Make the process sleep for SECONDS seconds, or until a signal arrives   and is not ignored.  The function returns the number of seconds less   than SECONDS which it actually slept (zero if it slept the full time).   If a signal handler does a `longjmp' or modifies the handling of the   SIGALRM signal while inside `sleep' call, the handling of the SIGALRM   signal afterwards is undefined.  There is no return value to indicate   error, but if `sleep' returns SECONDS, it probably didn't work.  */unsigned intDEFUN(sleep, (seconds), unsigned int seconds){  errno = ENOSYS;  return seconds;}

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