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GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/misc/procclose.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * Glenn Fowler

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 * AT&T Research

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 *

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 * close a proc opened by procopen()

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 * otherwise exit() status of process is returned

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 */

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#include "proclib.h"

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int

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procclose(register Proc_t* p)

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{

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	int	pid;

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	int	flags = 0;

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	int	status = -1;

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	if (p)

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	{

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		if (p->rfd >= 0)

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			close(p->rfd);

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		if (p->wfd >= 0 && p->wfd != p->rfd)

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			close(p->wfd);

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		if (p->flags & PROC_ORPHAN)

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			status = 0;

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		else

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		{

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			if (p->flags & PROC_ZOMBIE)

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			{

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				/*

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				 * process may leave a zombie behind

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				 * give it a chance to do that but

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				 * don't hang waiting for it

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				 */

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				flags |= WNOHANG;

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				sleep(1);

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			}

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			if (!(p->flags & PROC_FOREGROUND))

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				sigcritical(SIG_REG_EXEC|SIG_REG_PROC);

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			while ((pid = waitpid(p->pid, &status, flags)) == -1 && errno == EINTR);

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			if (pid != p->pid && (flags & WNOHANG))

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				status = 0;

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			if (!(p->flags & PROC_FOREGROUND))

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				sigcritical(0);

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			else

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			{

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				if (p->sigint != SIG_IGN)

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					signal(SIGINT, p->sigint);

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				if (p->sigquit != SIG_IGN)

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					signal(SIGQUIT, p->sigquit);

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#if defined(SIGCHLD)

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#if _lib_sigprocmask

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				sigprocmask(SIG_SETMASK, &p->mask, NiL);

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#else

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#if _lib_sigsetmask

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				sigsetmask(p->mask);

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#else

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				if (p->sigchld != SIG_DFL)

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					signal(SIGCHLD, p->sigchld);

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#endif

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#endif

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#endif

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			}

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			status = status == -1 ?

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				 EXIT_QUIT :

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				 WIFSIGNALED(status) ?

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				 EXIT_TERM(WTERMSIG(status)) :

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				 EXIT_CODE(WEXITSTATUS(status));

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		}

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		procfree(p);

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	}

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	else

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		status = errno == ENOENT ? EXIT_NOTFOUND : EXIT_NOEXEC;

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	return status;

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}

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