2 * Copyright (c) 1988 The Regents of the University of California.
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the University of California, Berkeley. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 /* this came out of the ftpd sources; it's been modified to avoid the
23 * globbing stuff since we don't need it. also execvp instead of execv.
28 static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
30 static const char rcsid[] =
35 #include <sys/signal.h>
41 #if defined(LOGIN_CAP)
42 # include <login_cap.h>
47 #define WANT_GLOBBING 0
50 * Special version of popen which avoids call to shell. This insures noone
51 * may create a pipe to a hidden program as a side effect of a list or dir
58 cron_popen(program, type, e)
67 char *argv[MAX_ARGS + 1];
68 # if defined(LOGIN_CAP)
76 extern char **glob(), **copyblk();
79 if ((*type != 'r' && *type != 'w') || type[1])
83 if ((fds = getdtablesize()) <= 0)
85 if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
87 bzero((char *)pids, fds * sizeof(PID_T));
92 /* break up string into pieces */
93 for (argc = 0, cp = program; argc < MAX_ARGS; cp = NULL)
94 if (!(argv[argc++] = strtok(cp, " \t\n")))
96 argv[MAX_ARGS] = NULL;
101 for (gargc = argc = 1; argv[argc]; argc++) {
102 if (!(pop = glob(argv[argc]))) { /* globbing failed */
107 argv[argc] = (char *)pop; /* save to free later */
108 while (*pop && gargc < 1000)
109 gargv[gargc++] = *pop++;
115 switch(pid = vfork()) {
117 (void)close(pdes[0]);
118 (void)close(pdes[1]);
127 /* get new pgrp, void tty, etc.
132 /* Do not share our parent's stdin */
134 (void)open(_PATH_DEVNULL, O_RDWR);
137 dup2(pdes[1], 2); /* stderr, too! */
138 (void)close(pdes[1]);
140 (void)close(pdes[0]);
144 (void)close(pdes[0]);
146 /* Hack: stdout gets revoked */
148 (void)open(_PATH_DEVNULL, O_RDWR);
150 (void)open(_PATH_DEVNULL, O_RDWR);
151 (void)close(pdes[1]);
154 /* Set user's entire context, but skip the environment
155 * as cron provides a separate interface for this
157 usernm = env_get("LOGNAME", e->envp);
158 # if defined(LOGIN_CAP)
159 if ((pwd = getpwnam(usernm)) == NULL)
160 pwd = getpwuid(e->uid);
163 pwd->pw_gid = e->gid;
164 if (e->class != NULL)
165 lc = login_getclass(e->class);
168 setusercontext(lc, pwd, e->uid,
169 LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETENV)) == 0)
172 /* fall back to the old method */
175 /* set our directory, uid and gid. Set gid first,
176 * since once we set uid, we've lost root privledges.
180 initgroups(usernm, e->gid);
183 setuid(e->uid); /* we aren't root after this..*/
184 #if defined(LOGIN_CAP)
189 chdir(env_get("HOME", e->envp));
192 execvp(gargv[0], gargv);
194 execvp(argv[0], argv);
198 /* parent; assume fdopen can't fail... */
200 iop = fdopen(pdes[0], type);
201 (void)close(pdes[1]);
203 iop = fdopen(pdes[1], type);
204 (void)close(pdes[0]);
206 pids[fileno(iop)] = pid;
210 for (argc = 1; argv[argc] != NULL; argc++) {
211 /* blkfree((char **)argv[argc]); */
212 free((char *)argv[argc]);
228 * pclose returns -1 if stream is not associated with a
229 * `popened' command, or, if already `pclosed'.
231 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
234 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
235 while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
237 (void)sigsetmask(omask);
239 return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));