Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/mail/popen.c	Lines:	45	195	23.1 %
Date:	2017-11-07	Branches:	16	114	14.0 %


/*	$OpenBSD: popen.c,v 1.38 2015/10/16 17:56:07 mmcc Exp $	*/
/*	$NetBSD: popen.c,v 1.6 1997/05/13 06:48:42 mikel Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "rcv.h"
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include <stdarg.h>
#include "extern.h"

#define READ 0
#define WRITE 1

struct fp {
	FILE *fp;
	int pipe;
	pid_t pid;
	struct fp *link;
};
static struct fp *fp_head;

struct child {
	pid_t pid;
	char done;
	char free;
	int status;
	struct child *link;
};
static struct child *child, *child_freelist = NULL;

static struct child *findchild(pid_t, int);
static void delchild(struct child *);
static pid_t file_pid(FILE *);
static int handle_spool_locks(int);

FILE *
Fopen(char *file, char *mode)
{
	FILE *fp;

	if ((fp = fopen(file, mode)) != NULL) {
		register_file(fp, 0, 0);
		(void)fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
	}
	return(fp);
}

FILE *
Fdopen(int fd, char *mode)
{
	FILE *fp;

	if ((fp = fdopen(fd, mode)) != NULL) {
		register_file(fp, 0, 0);
		(void)fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
	}
	return(fp);
}

int
Fclose(FILE *fp)
{

	unregister_file(fp);
	return(fclose(fp));
}

FILE *
Popen(char *cmd, char *mode)
{
	int p[2];
	int myside, hisside, fd0, fd1;
	pid_t pid;
	sigset_t nset;
	FILE *fp;

	if (pipe(p) < 0)
		return(NULL);
	(void)fcntl(p[READ], F_SETFD, FD_CLOEXEC);
	(void)fcntl(p[WRITE], F_SETFD, FD_CLOEXEC);
	if (*mode == 'r') {
		myside = p[READ];
		hisside = fd0 = fd1 = p[WRITE];
	} else {
		myside = p[WRITE];
		hisside = fd0 = p[READ];
		fd1 = -1;
	}
	sigemptyset(&nset);
	pid = start_command(value("SHELL"), &nset, fd0, fd1, "-c", cmd, NULL);
	if (pid < 0) {
		(void)close(p[READ]);
		(void)close(p[WRITE]);
		return(NULL);
	}
	(void)close(hisside);
	if ((fp = fdopen(myside, mode)) != NULL)
		register_file(fp, 1, pid);
	return(fp);
}

int
Pclose(FILE *ptr)
{
	int i;
	sigset_t nset, oset;

	i = file_pid(ptr);
	unregister_file(ptr);
	(void)fclose(ptr);
	sigemptyset(&nset);
	sigaddset(&nset, SIGINT);
	sigaddset(&nset, SIGHUP);
	sigprocmask(SIG_BLOCK, &nset, &oset);
	i = wait_child(i);
	sigprocmask(SIG_SETMASK, &oset, NULL);
	return(i);
}

void
close_all_files(void)
{

	while (fp_head)
		if (fp_head->pipe)
			(void)Pclose(fp_head->fp);
		else
			(void)Fclose(fp_head->fp);
}

void
register_file(FILE *fp, int pipe, pid_t pid)
{
	struct fp *fpp;

	if ((fpp = malloc(sizeof(*fpp))) == NULL)
		err(1, "malloc");
	fpp->fp = fp;
	fpp->pipe = pipe;
	fpp->pid = pid;
	fpp->link = fp_head;
	fp_head = fpp;
}

void
unregister_file(FILE *fp)
{
	struct fp **pp, *p;

	for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
		if (p->fp == fp) {
			*pp = p->link;
			(void)free(p);
			return;
		}
	errx(1, "Invalid file pointer");
}

static pid_t
file_pid(FILE *fp)
{
	struct fp *p;

	for (p = fp_head; p; p = p->link)
		if (p->fp == fp)
			return(p->pid);
	errx(1, "Invalid file pointer");
	/*NOTREACHED*/
}

/*
 * Run a command without a shell, with optional arguments and splicing
 * of stdin (-1 means none) and stdout.  The command name can be a sequence
 * of words.
 * Signals must be handled by the caller.
 * "nset" contains the signals to ignore in the new process.
 * SIGINT is enabled unless it's in "nset".
 */
pid_t
start_commandv(char *cmd, sigset_t *nset, int infd, int outfd, va_list args)
{
	pid_t pid;

	if ((pid = fork()) < 0) {
		warn("fork");
		return(-1);
	}
	if (pid == 0) {
		char *argv[100];
		int i = getrawlist(cmd, argv, sizeof(argv)/ sizeof(*argv));

		while ((argv[i++] = va_arg(args, char *)))
			;
		argv[i] = NULL;
		prepare_child(nset, infd, outfd);
		execvp(argv[0], argv);
		warn("%s", argv[0]);
		_exit(1);
	}
	return(pid);
}

int
run_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
{
	pid_t pid;
	va_list args;

	va_start(args, outfd);
	pid = start_commandv(cmd, nset, infd, outfd, args);
	va_end(args);
	if (pid < 0)
		return(-1);
	return(wait_command(pid));
}

int
start_command(char *cmd, sigset_t *nset, int infd, int outfd, ...)
{
	va_list args;
	int r;

	va_start(args, outfd);
	r = start_commandv(cmd, nset, infd, outfd, args);
	va_end(args);
	return(r);
}

void
prepare_child(sigset_t *nset, int infd, int outfd)
{
	int i;
	sigset_t eset;

	/*
	 * All file descriptors other than 0, 1, and 2 are supposed to be
	 * close-on-exec.
	 */
	if (infd > 0) {
		dup2(infd, 0);
	} else if (infd != 0) {
		/* we don't want the child stealing my stdin input */
		close(0);
		open(_PATH_DEVNULL, O_RDONLY, 0);
	}
	if (outfd >= 0 && outfd != 1)
		dup2(outfd, 1);
	if (nset == NULL)
		return;
	if (nset != NULL) {
		for (i = 1; i < NSIG; i++)
			if (sigismember(nset, i))
				(void)signal(i, SIG_IGN);
	}
	if (nset == NULL || !sigismember(nset, SIGINT))
		(void)signal(SIGINT, SIG_DFL);
	sigemptyset(&eset);
	(void)sigprocmask(SIG_SETMASK, &eset, NULL);
}

int
wait_command(pid_t pid)
{

	if (wait_child(pid) < 0) {
		puts("Fatal error in process.");
		return(-1);
	}
	return(0);
}

static struct child *
findchild(pid_t pid, int dont_alloc)
{
	struct child **cpp;

	for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
	     cpp = &(*cpp)->link)
			;
	if (*cpp == NULL) {
		if (dont_alloc)
			return(NULL);
		if (child_freelist) {
			*cpp = child_freelist;
			child_freelist = (*cpp)->link;
		} else {
			*cpp = malloc(sizeof(struct child));
			if (*cpp == NULL)
				err(1, "malloc");
		}
		(*cpp)->pid = pid;
		(*cpp)->done = (*cpp)->free = 0;
		(*cpp)->link = NULL;
	}
	return(*cpp);
}

static void
delchild(struct child *cp)
{
	struct child **cpp;

	for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
		;
	*cpp = cp->link;
	cp->link = child_freelist;
	child_freelist = cp;
}

/* ARGSUSED */
void
sigchild(int signo)
{
	pid_t pid;
	int status;
	struct child *cp;
	int save_errno = errno;

	while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
		cp = findchild(pid, 1);
		if (!cp)
			continue;
		if (cp->free)
			delchild(cp);
		else {
			cp->done = 1;
			cp->status = status;
		}
	}
	errno = save_errno;
}

int wait_status;

/*
 * Wait for a specific child to die.
 */
int
wait_child(pid_t pid)
{
	struct child *cp;
	sigset_t nset, oset;
	pid_t rv = 0;

	sigemptyset(&nset);
	sigaddset(&nset, SIGCHLD);
	sigprocmask(SIG_BLOCK, &nset, &oset);
	/*
	 * If we have not already waited on the pid (via sigchild)
	 * wait on it now.  Otherwise, use the wait status stashed
	 * by sigchild.
	 */
	cp = findchild(pid, 1);
	if (cp == NULL || !cp->done)
		rv = waitpid(pid, &wait_status, 0);
	else
		wait_status = cp->status;
	if (cp != NULL)
		delchild(cp);
	sigprocmask(SIG_SETMASK, &oset, NULL);
	if (rv == -1 || (WIFEXITED(wait_status) && WEXITSTATUS(wait_status)))
		return(-1);
	else
		return(0);
}

/*
 * Mark a child as don't care.
 */
void
free_child(pid_t pid)
{
	struct child *cp;
	sigset_t nset, oset;

	sigemptyset(&nset);
	sigaddset(&nset, SIGCHLD);
	sigprocmask(SIG_BLOCK, &nset, &oset);
	if ((cp = findchild(pid, 0)) != NULL) {
		if (cp->done)
			delchild(cp);
		else
			cp->free = 1;
	}
	sigprocmask(SIG_SETMASK, &oset, NULL);
}

/*
 * Lock(1)/unlock(0) mail spool using lockspool(1).
 * Returns 1 for success, 0 for failure, -1 for bad usage.
 */
static int
handle_spool_locks(int action)
{
	static FILE *lockfp = NULL;

	if (action == 0) {
		/* Clear the lock */
		if (lockfp == NULL) {
			fputs("handle_spool_locks: no spool lock to remove.\n",
			    stderr);
			return(-1);
		}
		(void)Pclose(lockfp);
		lockfp = NULL;
	} else if (action == 1) {
		char *cmd;
		char buf[sizeof(_PATH_LOCKSPOOL) + LOGIN_NAME_MAX + 1];

		/* XXX - lockspool requires root for user arg, we do not */
		if (uflag) {
			snprintf(buf, sizeof(buf), "%s %s", _PATH_LOCKSPOOL,
			    myname);
			cmd = buf;
		} else
			cmd = _PATH_LOCKSPOOL;

		/* Create the lock */
		lockfp = Popen(cmd, "r");
		if (lockfp == NULL)
			return(0);
		if (getc(lockfp) != '1') {
			Pclose(lockfp);
			lockfp = NULL;
			return(0);
		}
	} else {
		(void)fprintf(stderr, "handle_spool_locks: unknown action %d\n",
		    action);
		return(-1);
	}

	return(1);
}

int
spool_lock(void)
{

	return(handle_spool_locks(1));
}

int
spool_unlock(void)
{

	return(handle_spool_locks(0));
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: popen.c,v 1.38 2015/10/16 17:56:07 mmcc Exp $ */
2			/* $NetBSD: popen.c,v 1.6 1997/05/13 06:48:42 mikel Exp $ */
3
4			/*
5			* Copyright (c) 1980, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include "rcv.h"
34			#include <sys/wait.h>
35			#include <fcntl.h>
36			#include <errno.h>
37			#include <stdarg.h>
38			#include "extern.h"
39
40			#define READ 0
41			#define WRITE 1
42
43			struct fp {
44			FILE *fp;
45			int pipe;
46			pid_t pid;
47			struct fp *link;
48			};
49			static struct fp *fp_head;
50
51			struct child {
52			pid_t pid;
53			char done;
54			char free;
55			int status;
56			struct child *link;
57			};
58			static struct child child, child_freelist = NULL;
59
60			static struct child *findchild(pid_t, int);
61			static void delchild(struct child *);
62			static pid_t file_pid(FILE *);
63			static int handle_spool_locks(int);
64
65			FILE *
66			Fopen(char file, char mode)
67			{
68			FILE *fp;
69
70	✓✓	12	if ((fp = fopen(file, mode)) != NULL) {
71		4	register_file(fp, 0, 0);
72	✓✗	12	(void)fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
73		4	}
74		6	return(fp);
75			}
76
77			FILE *
78			Fdopen(int fd, char *mode)
79			{
80			FILE *fp;
81
82	✓✗	8	if ((fp = fdopen(fd, mode)) != NULL) {
83		4	register_file(fp, 0, 0);
84	✓✗	12	(void)fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
85		4	}
86		4	return(fp);
87			}
88
89			int
90			Fclose(FILE *fp)
91			{
92
93		16	unregister_file(fp);
94		8	return(fclose(fp));
95			}
96
97			FILE *
98			Popen(char cmd, char mode)
99			{
100			int p[2];
101			int myside, hisside, fd0, fd1;
102			pid_t pid;
103			sigset_t nset;
104			FILE *fp;
105
106			if (pipe(p) < 0)
107			return(NULL);
108			(void)fcntl(p[READ], F_SETFD, FD_CLOEXEC);
109			(void)fcntl(p[WRITE], F_SETFD, FD_CLOEXEC);
110			if (*mode == 'r') {
111			myside = p[READ];
112			hisside = fd0 = fd1 = p[WRITE];
113			} else {
114			myside = p[WRITE];
115			hisside = fd0 = p[READ];
116			fd1 = -1;
117			}
118			sigemptyset(&nset);
119			pid = start_command(value("SHELL"), &nset, fd0, fd1, "-c", cmd, NULL);
120			if (pid < 0) {
121			(void)close(p[READ]);
122			(void)close(p[WRITE]);
123			return(NULL);
124			}
125			(void)close(hisside);
126			if ((fp = fdopen(myside, mode)) != NULL)
127			register_file(fp, 1, pid);
128			return(fp);
129			}
130
131			int
132			Pclose(FILE *ptr)
133			{
134			int i;
135			sigset_t nset, oset;
136
137			i = file_pid(ptr);
138			unregister_file(ptr);
139			(void)fclose(ptr);
140			sigemptyset(&nset);
141			sigaddset(&nset, SIGINT);
142			sigaddset(&nset, SIGHUP);
143			sigprocmask(SIG_BLOCK, &nset, &oset);
144			i = wait_child(i);
145			sigprocmask(SIG_SETMASK, &oset, NULL);
146			return(i);
147			}
148
149			void
150			close_all_files(void)
151			{
152
153			while (fp_head)
154			if (fp_head->pipe)
155			(void)Pclose(fp_head->fp);
156			else
157			(void)Fclose(fp_head->fp);
158			}
159
160			void
161			register_file(FILE *fp, int pipe, pid_t pid)
162			{
163			struct fp *fpp;
164
165	✗✓	16	if ((fpp = malloc(sizeof(*fpp))) == NULL)
166			err(1, "malloc");
167		8	fpp->fp = fp;
168		8	fpp->pipe = pipe;
169		8	fpp->pid = pid;
170		8	fpp->link = fp_head;
171		8	fp_head = fpp;
172		8	}
173
174			void
175			unregister_file(FILE *fp)
176			{
177			struct fp *pp, p;
178
179	✓✗	32	for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
180	✓✓	12	if (p->fp == fp) {
181		8	*pp = p->link;
182		8	(void)free(p);
183			return;
184			}
185			errx(1, "Invalid file pointer");
186		8	}
187
188			static pid_t
189			file_pid(FILE *fp)
190			{
191			struct fp *p;
192
193			for (p = fp_head; p; p = p->link)
194			if (p->fp == fp)
195			return(p->pid);
196			errx(1, "Invalid file pointer");
197			/NOTREACHED/
198			}
199
200			/*
201			* Run a command without a shell, with optional arguments and splicing
202			* of stdin (-1 means none) and stdout. The command name can be a sequence
203			* of words.
204			* Signals must be handled by the caller.
205			* "nset" contains the signals to ignore in the new process.
206			* SIGINT is enabled unless it's in "nset".
207			*/
208			pid_t
209			start_commandv(char cmd, sigset_t nset, int infd, int outfd, va_list args)
210			{
211			pid_t pid;
212
213			if ((pid = fork()) < 0) {
214			warn("fork");
215			return(-1);
216			}
217			if (pid == 0) {
218			char *argv[100];
219			int i = getrawlist(cmd, argv, sizeof(argv)/ sizeof(*argv));
220
221			while ((argv[i++] = va_arg(args, char *)))
222			;
223			argv[i] = NULL;
224			prepare_child(nset, infd, outfd);
225			execvp(argv[0], argv);
226			warn("%s", argv[0]);
227			_exit(1);
228			}
229			return(pid);
230			}
231
232			int
233			run_command(char cmd, sigset_t nset, int infd, int outfd, ...)
234			{
235			pid_t pid;
236			va_list args;
237
238			va_start(args, outfd);
239			pid = start_commandv(cmd, nset, infd, outfd, args);
240			va_end(args);
241			if (pid < 0)
242			return(-1);
243			return(wait_command(pid));
244			}
245
246			int
247			start_command(char cmd, sigset_t nset, int infd, int outfd, ...)
248			{
249			va_list args;
250			int r;
251
252			va_start(args, outfd);
253			r = start_commandv(cmd, nset, infd, outfd, args);
254			va_end(args);
255			return(r);
256			}
257
258			void
259			prepare_child(sigset_t *nset, int infd, int outfd)
260			{
261			int i;
262			sigset_t eset;
263
264			/*
265			* All file descriptors other than 0, 1, and 2 are supposed to be
266			* close-on-exec.
267			*/
268			if (infd > 0) {
269			dup2(infd, 0);
270			} else if (infd != 0) {
271			/* we don't want the child stealing my stdin input */
272			close(0);
273			open(_PATH_DEVNULL, O_RDONLY, 0);
274			}
275			if (outfd >= 0 && outfd != 1)
276			dup2(outfd, 1);
277			if (nset == NULL)
278			return;
279			if (nset != NULL) {
280			for (i = 1; i < NSIG; i++)
281			if (sigismember(nset, i))
282			(void)signal(i, SIG_IGN);
283			}
284			if (nset == NULL \|\| !sigismember(nset, SIGINT))
285			(void)signal(SIGINT, SIG_DFL);
286			sigemptyset(&eset);
287			(void)sigprocmask(SIG_SETMASK, &eset, NULL);
288			}
289
290			int
291			wait_command(pid_t pid)
292			{
293
294			if (wait_child(pid) < 0) {
295			puts("Fatal error in process.");
296			return(-1);
297			}
298			return(0);
299			}
300
301			static struct child *
302			findchild(pid_t pid, int dont_alloc)
303			{
304			struct child **cpp;
305
306	✗✓✗✗	6	for (cpp = &child; cpp != NULL && (cpp)->pid != pid;
307			cpp = &(*cpp)->link)
308			;
309	✓✗	2	if (*cpp == NULL) {
310	✗✓	2	if (dont_alloc)
311			return(NULL);
312	✗✓	2	if (child_freelist) {
313			*cpp = child_freelist;
314			child_freelist = (*cpp)->link;
315			} else {
316		2	*cpp = malloc(sizeof(struct child));
317	✗✓	2	if (*cpp == NULL)
318			err(1, "malloc");
319			}
320		2	(*cpp)->pid = pid;
321		2	(cpp)->done = (cpp)->free = 0;
322		2	(*cpp)->link = NULL;
323		2	}
324		2	return(*cpp);
325		2	}
326
327			static void
328			delchild(struct child *cp)
329			{
330			struct child **cpp;
331
332			for (cpp = &child; cpp != cp; cpp = &(cpp)->link)
333			;
334			*cpp = cp->link;
335			cp->link = child_freelist;
336			child_freelist = cp;
337			}
338
339			/* ARGSUSED */
340			void
341			sigchild(int signo)
342			{
343			pid_t pid;
344			int status;
345			struct child *cp;
346			int save_errno = errno;
347
348			while ((pid = waitpid((pid_t)-1, &status, WNOHANG)) > 0) {
349			cp = findchild(pid, 1);
350			if (!cp)
351			continue;
352			if (cp->free)
353			delchild(cp);
354			else {
355			cp->done = 1;
356			cp->status = status;
357			}
358			}
359			errno = save_errno;
360			}
361
362			int wait_status;
363
364			/*
365			* Wait for a specific child to die.
366			*/
367			int
368			wait_child(pid_t pid)
369			{
370			struct child *cp;
371			sigset_t nset, oset;
372			pid_t rv = 0;
373
374			sigemptyset(&nset);
375			sigaddset(&nset, SIGCHLD);
376			sigprocmask(SIG_BLOCK, &nset, &oset);
377			/*
378			* If we have not already waited on the pid (via sigchild)
379			* wait on it now. Otherwise, use the wait status stashed
380			* by sigchild.
381			*/
382			cp = findchild(pid, 1);
383			if (cp == NULL \|\| !cp->done)
384			rv = waitpid(pid, &wait_status, 0);
385			else
386			wait_status = cp->status;
387			if (cp != NULL)
388			delchild(cp);
389			sigprocmask(SIG_SETMASK, &oset, NULL);
390			if (rv == -1 \|\| (WIFEXITED(wait_status) && WEXITSTATUS(wait_status)))
391			return(-1);
392			else
393			return(0);
394			}
395
396			/*
397			* Mark a child as don't care.
398			*/
399			void
400			free_child(pid_t pid)
401			{
402			struct child *cp;
403		4	sigset_t nset, oset;
404
405		2	sigemptyset(&nset);
406		2	sigaddset(&nset, SIGCHLD);
407		2	sigprocmask(SIG_BLOCK, &nset, &oset);
408	✓✗	2	if ((cp = findchild(pid, 0)) != NULL) {
409	✗✓	2	if (cp->done)
410			delchild(cp);
411			else
412		2	cp->free = 1;
413			}
414		2	sigprocmask(SIG_SETMASK, &oset, NULL);
415		2	}
416
417			/*
418			* Lock(1)/unlock(0) mail spool using lockspool(1).
419			* Returns 1 for success, 0 for failure, -1 for bad usage.
420			*/
421			static int
422			handle_spool_locks(int action)
423			{
424			static FILE *lockfp = NULL;
425
426			if (action == 0) {
427			/* Clear the lock */
428			if (lockfp == NULL) {
429			fputs("handle_spool_locks: no spool lock to remove.\n",
430			stderr);
431			return(-1);
432			}
433			(void)Pclose(lockfp);
434			lockfp = NULL;
435			} else if (action == 1) {
436			char *cmd;
437			char buf[sizeof(_PATH_LOCKSPOOL) + LOGIN_NAME_MAX + 1];
438
439			/* XXX - lockspool requires root for user arg, we do not */
440			if (uflag) {
441			snprintf(buf, sizeof(buf), "%s %s", _PATH_LOCKSPOOL,
442			myname);
443			cmd = buf;
444			} else
445			cmd = _PATH_LOCKSPOOL;
446
447			/* Create the lock */
448			lockfp = Popen(cmd, "r");
449			if (lockfp == NULL)
450			return(0);
451			if (getc(lockfp) != '1') {
452			Pclose(lockfp);
453			lockfp = NULL;
454			return(0);
455			}
456			} else {
457			(void)fprintf(stderr, "handle_spool_locks: unknown action %d\n",
458			action);
459			return(-1);
460			}
461
462			return(1);
463			}
464
465			int
466			spool_lock(void)
467			{
468
469			return(handle_spool_locks(1));
470			}
471
472			int
473			spool_unlock(void)
474			{
475
476			return(handle_spool_locks(0));
477			}