Annotation of src/usr.bin/mail/popen.c, Revision 1.5
1.5 ! deraadt 1: /* $OpenBSD: popen.c,v 1.4 1997/03/29 03:01:47 millert Exp $ */
1.2 deraadt 2: /* $NetBSD: popen.c,v 1.4 1996/06/08 19:48:35 christos Exp $ */
3:
1.1 deraadt 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. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.2 deraadt 38: #if 0
39: static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/6/93";
40: #else
1.5 ! deraadt 41: static char rcsid[] = "$OpenBSD: popen.c,v 1.4 1997/03/29 03:01:47 millert Exp $";
1.2 deraadt 42: #endif
1.1 deraadt 43: #endif /* not lint */
44:
45: #include "rcv.h"
46: #include <sys/wait.h>
47: #include <fcntl.h>
48: #include "extern.h"
49:
50: #define READ 0
51: #define WRITE 1
52:
53: struct fp {
54: FILE *fp;
55: int pipe;
56: int pid;
57: struct fp *link;
58: };
59: static struct fp *fp_head;
60:
61: struct child {
62: int pid;
63: char done;
64: char free;
65: union wait status;
66: struct child *link;
67: };
68: static struct child *child;
69: static struct child *findchild __P((int));
70: static void delchild __P((struct child *));
1.2 deraadt 71: static int file_pid __P((FILE *));
1.4 millert 72: static int handle_spool_locks __P((int));
1.1 deraadt 73:
74: FILE *
75: Fopen(file, mode)
76: char *file, *mode;
77: {
78: FILE *fp;
79:
80: if ((fp = fopen(file, mode)) != NULL) {
81: register_file(fp, 0, 0);
82: (void) fcntl(fileno(fp), F_SETFD, 1);
83: }
84: return fp;
85: }
86:
87: FILE *
88: Fdopen(fd, mode)
89: int fd;
90: char *mode;
91: {
92: FILE *fp;
93:
94: if ((fp = fdopen(fd, mode)) != NULL) {
95: register_file(fp, 0, 0);
96: (void) fcntl(fileno(fp), F_SETFD, 1);
97: }
98: return fp;
99: }
100:
101: int
102: Fclose(fp)
103: FILE *fp;
104: {
105: unregister_file(fp);
106: return fclose(fp);
107: }
108:
109: FILE *
110: Popen(cmd, mode)
111: char *cmd;
112: char *mode;
113: {
114: int p[2];
115: int myside, hisside, fd0, fd1;
116: int pid;
1.2 deraadt 117: sigset_t nset;
1.1 deraadt 118: FILE *fp;
119:
120: if (pipe(p) < 0)
121: return NULL;
122: (void) fcntl(p[READ], F_SETFD, 1);
123: (void) fcntl(p[WRITE], F_SETFD, 1);
124: if (*mode == 'r') {
125: myside = p[READ];
126: fd0 = -1;
127: hisside = fd1 = p[WRITE];
128: } else {
129: myside = p[WRITE];
130: hisside = fd0 = p[READ];
131: fd1 = -1;
132: }
1.2 deraadt 133: sigemptyset(&nset);
134: if ((pid = start_command(cmd, &nset, fd0, fd1, NOSTR, NOSTR, NOSTR)) < 0) {
1.1 deraadt 135: close(p[READ]);
136: close(p[WRITE]);
137: return NULL;
138: }
139: (void) close(hisside);
140: if ((fp = fdopen(myside, mode)) != NULL)
141: register_file(fp, 1, pid);
142: return fp;
143: }
144:
145: int
146: Pclose(ptr)
147: FILE *ptr;
148: {
149: int i;
1.2 deraadt 150: sigset_t nset, oset;
1.1 deraadt 151:
152: i = file_pid(ptr);
153: unregister_file(ptr);
154: (void) fclose(ptr);
1.2 deraadt 155: sigemptyset(&nset);
156: sigaddset(&nset, SIGINT);
157: sigaddset(&nset, SIGHUP);
158: sigprocmask(SIG_BLOCK, &nset, &oset);
1.1 deraadt 159: i = wait_child(i);
1.2 deraadt 160: sigprocmask(SIG_SETMASK, &oset, NULL);
1.1 deraadt 161: return i;
162: }
163:
164: void
165: close_all_files()
166: {
167:
168: while (fp_head)
169: if (fp_head->pipe)
170: (void) Pclose(fp_head->fp);
171: else
172: (void) Fclose(fp_head->fp);
173: }
174:
175: void
176: register_file(fp, pipe, pid)
177: FILE *fp;
178: int pipe, pid;
179: {
180: struct fp *fpp;
181:
182: if ((fpp = (struct fp *) malloc(sizeof *fpp)) == NULL)
183: panic("Out of memory");
184: fpp->fp = fp;
185: fpp->pipe = pipe;
186: fpp->pid = pid;
187: fpp->link = fp_head;
188: fp_head = fpp;
189: }
190:
191: void
192: unregister_file(fp)
193: FILE *fp;
194: {
195: struct fp **pp, *p;
196:
1.2 deraadt 197: for (pp = &fp_head; (p = *pp) != NULL; pp = &p->link)
1.1 deraadt 198: if (p->fp == fp) {
199: *pp = p->link;
200: free((char *) p);
201: return;
202: }
203: panic("Invalid file pointer");
204: }
205:
1.2 deraadt 206: static int
1.1 deraadt 207: file_pid(fp)
208: FILE *fp;
209: {
210: struct fp *p;
211:
212: for (p = fp_head; p; p = p->link)
213: if (p->fp == fp)
214: return (p->pid);
215: panic("Invalid file pointer");
216: /*NOTREACHED*/
217: }
218:
219: /*
220: * Run a command without a shell, with optional arguments and splicing
221: * of stdin and stdout. The command name can be a sequence of words.
222: * Signals must be handled by the caller.
223: * "Mask" contains the signals to ignore in the new process.
224: * SIGINT is enabled unless it's in the mask.
225: */
226: /*VARARGS4*/
227: int
228: run_command(cmd, mask, infd, outfd, a0, a1, a2)
229: char *cmd;
1.2 deraadt 230: sigset_t *mask;
231: int infd, outfd;
1.1 deraadt 232: char *a0, *a1, *a2;
233: {
234: int pid;
235:
236: if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
237: return -1;
238: return wait_command(pid);
239: }
240:
241: /*VARARGS4*/
242: int
243: start_command(cmd, mask, infd, outfd, a0, a1, a2)
244: char *cmd;
1.2 deraadt 245: sigset_t *mask;
246: int infd, outfd;
1.1 deraadt 247: char *a0, *a1, *a2;
248: {
249: int pid;
250:
251: if ((pid = vfork()) < 0) {
252: perror("fork");
253: return -1;
254: }
255: if (pid == 0) {
256: char *argv[100];
257: int i = getrawlist(cmd, argv, sizeof argv / sizeof *argv);
258:
259: if ((argv[i++] = a0) != NOSTR &&
260: (argv[i++] = a1) != NOSTR &&
261: (argv[i++] = a2) != NOSTR)
262: argv[i] = NOSTR;
263: prepare_child(mask, infd, outfd);
264: execvp(argv[0], argv);
265: perror(argv[0]);
266: _exit(1);
267: }
268: return pid;
269: }
270:
271: void
1.2 deraadt 272: prepare_child(nset, infd, outfd)
273: sigset_t *nset;
274: int infd, outfd;
1.1 deraadt 275: {
276: int i;
1.2 deraadt 277: sigset_t fset;
1.1 deraadt 278:
279: /*
280: * All file descriptors other than 0, 1, and 2 are supposed to be
281: * close-on-exec.
282: */
283: if (infd >= 0)
284: dup2(infd, 0);
285: if (outfd >= 0)
286: dup2(outfd, 1);
1.3 dm 287: if (nset) {
1.5 ! deraadt 288: for (i = 1; i < NSIG; i++)
1.3 dm 289: if (sigismember(nset, i))
290: (void) signal(i, SIG_IGN);
291: if (!sigismember(nset, SIGINT))
292: (void) signal(SIGINT, SIG_DFL);
293: }
1.2 deraadt 294: sigfillset(&fset);
295: (void) sigprocmask(SIG_UNBLOCK, &fset, NULL);
1.1 deraadt 296: }
297:
298: int
299: wait_command(pid)
300: int pid;
301: {
302:
303: if (wait_child(pid) < 0) {
304: printf("Fatal error in process.\n");
305: return -1;
306: }
307: return 0;
308: }
309:
310: static struct child *
311: findchild(pid)
312: int pid;
313: {
314: register struct child **cpp;
315:
316: for (cpp = &child; *cpp != NULL && (*cpp)->pid != pid;
317: cpp = &(*cpp)->link)
318: ;
319: if (*cpp == NULL) {
320: *cpp = (struct child *) malloc(sizeof (struct child));
321: (*cpp)->pid = pid;
322: (*cpp)->done = (*cpp)->free = 0;
323: (*cpp)->link = NULL;
324: }
325: return *cpp;
326: }
327:
328: static void
329: delchild(cp)
330: register struct child *cp;
331: {
332: register struct child **cpp;
333:
334: for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
335: ;
336: *cpp = cp->link;
337: free((char *) cp);
338: }
339:
340: void
341: sigchild(signo)
342: int signo;
343: {
344: int pid;
345: union wait status;
346: register struct child *cp;
347:
348: while ((pid =
349: wait3((int *)&status, WNOHANG, (struct rusage *)0)) > 0) {
350: cp = findchild(pid);
351: if (cp->free)
352: delchild(cp);
353: else {
354: cp->done = 1;
355: cp->status = status;
356: }
357: }
358: }
359:
360: union wait wait_status;
361:
362: /*
363: * Wait for a specific child to die.
364: */
365: int
366: wait_child(pid)
367: int pid;
368: {
1.2 deraadt 369: sigset_t nset, oset;
1.1 deraadt 370: register struct child *cp = findchild(pid);
1.2 deraadt 371: sigemptyset(&nset);
372: sigaddset(&nset, SIGCHLD);
373: sigprocmask(SIG_BLOCK, &nset, &oset);
1.1 deraadt 374:
375: while (!cp->done)
1.2 deraadt 376: sigsuspend(&oset);
1.1 deraadt 377: wait_status = cp->status;
378: delchild(cp);
1.2 deraadt 379: sigprocmask(SIG_SETMASK, &oset, NULL);
1.1 deraadt 380: return wait_status.w_status ? -1 : 0;
381: }
382:
383: /*
384: * Mark a child as don't care.
385: */
386: void
387: free_child(pid)
388: int pid;
389: {
1.2 deraadt 390: sigset_t nset, oset;
1.1 deraadt 391: register struct child *cp = findchild(pid);
1.2 deraadt 392: sigemptyset(&nset);
393: sigaddset(&nset, SIGCHLD);
394: sigprocmask(SIG_BLOCK, &nset, &oset);
1.1 deraadt 395:
396: if (cp->done)
397: delchild(cp);
398: else
399: cp->free = 1;
1.2 deraadt 400: sigprocmask(SIG_SETMASK, &oset, NULL);
1.4 millert 401: }
402:
403: /*
404: * Lock(1)/unlock(0) mail spool using mail.local's -H flag.
405: * Returns 1 for success, 0 for failure, -1 for bad usage.
406: */
407: static int
408: handle_spool_locks(action)
409: int action;
410: {
411: char *cmd;
412: static FILE *lockfp = NULL;
413: static int lock_pid;
414:
415: if (action == 0) {
416: /* Clear the lock */
417: if (lockfp == NULL) {
418: fprintf(stderr,
419: "handle_spool_locks: no spool lock to remove.\n");
420: return (-1);
421: }
422: (void)kill(lock_pid, SIGTERM);
423: Pclose(lockfp);
424: lockfp = NULL;
425: } else if (action == 1) {
426: /* Create the lock */
427: if ((cmd = (char *) malloc(sizeof(_PATH_MAIL_LOCAL) + 3)) == NULL)
428: panic("Out of memory");
429: sprintf(cmd, "%s -H", _PATH_MAIL_LOCAL);
430: if ((lockfp = Popen(cmd, "r")) == NULL || getc(lockfp) != '1') {
431: lockfp = NULL;
432: free(cmd);
433: return (0);
434: }
435:
436: lock_pid = fp_head->pid; /* new entries added at head */
437: free(cmd);
438: } else {
439: fprintf(stderr, "handle_spool_locks: unknown action %d\n",
440: action);
441: return (-1);
442: }
443:
444: return (1);
445: }
446:
447: int
448: spool_lock()
449: {
450: return(handle_spool_locks(1));
451: }
452:
453: int
454: spool_unlock()
455: {
456: return(handle_spool_locks(0));
1.1 deraadt 457: }
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