1/*
2 * Copyright (c) 1988 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
7 *
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.
19 *
20 */
21
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.
24 */
25
26#ifndef lint
27#if 0
28static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
29#endif
30static const char rcsid[] =
| 1/*
2 * Copyright (c) 1988 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
7 *
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.
19 *
20 */
21
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.
24 */
25
26#ifndef lint
27#if 0
28static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
29#endif
30static const char rcsid[] =
|
32#endif /* not lint */
33
34#include "cron.h"
35#include <sys/signal.h>
36#include <fcntl.h>
37
38
39#define MAX_ARGS 100
40#define WANT_GLOBBING 0
41
42/*
43 * Special version of popen which avoids call to shell. This insures noone
44 * may create a pipe to a hidden program as a side effect of a list or dir
45 * command.
46 */
47static PID_T *pids;
48static int fds;
49
50FILE *
51cron_popen(program, type)
52 char *program, *type;
53{
54 register char *cp;
55 FILE *iop;
56 int argc, pdes[2];
57 PID_T pid;
58 char *argv[MAX_ARGS + 1];
59#if WANT_GLOBBING
60 char **pop, *vv[2];
61 int gargc;
62 char *gargv[1000];
63 extern char **glob(), **copyblk();
64#endif
65
66 if ((*type != 'r' && *type != 'w') || type[1])
67 return(NULL);
68
69 if (!pids) {
70 if ((fds = getdtablesize()) <= 0)
71 return(NULL);
72 if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
73 return(NULL);
74 bzero((char *)pids, fds * sizeof(PID_T));
75 }
76 if (pipe(pdes) < 0)
77 return(NULL);
78
79 /* break up string into pieces */
80 for (argc = 0, cp = program; argc < MAX_ARGS; cp = NULL)
81 if (!(argv[argc++] = strtok(cp, " \t\n")))
82 break;
83
84#if WANT_GLOBBING
85 /* glob each piece */
86 gargv[0] = argv[0];
87 for (gargc = argc = 1; argv[argc]; argc++) {
88 if (!(pop = glob(argv[argc]))) { /* globbing failed */
89 vv[0] = argv[argc];
90 vv[1] = NULL;
91 pop = copyblk(vv);
92 }
93 argv[argc] = (char *)pop; /* save to free later */
94 while (*pop && gargc < 1000)
95 gargv[gargc++] = *pop++;
96 }
97 gargv[gargc] = NULL;
98#endif
99
100 iop = NULL;
101 switch(pid = vfork()) {
102 case -1: /* error */
103 (void)close(pdes[0]);
104 (void)close(pdes[1]);
105 goto pfree;
106 /* NOTREACHED */
107 case 0: /* child */
108 if (*type == 'r') {
109 /* Do not share our parent's stdin */
110 (void)close(0);
111 (void)open("/dev/null", O_RDWR);
112 if (pdes[1] != 1) {
113 dup2(pdes[1], 1);
114 dup2(pdes[1], 2); /* stderr, too! */
115 (void)close(pdes[1]);
116 }
117 (void)close(pdes[0]);
118 } else {
119 if (pdes[0] != 0) {
120 dup2(pdes[0], 0);
121 (void)close(pdes[0]);
122 }
123 /* Hack: stdout gets revoked */
124 (void)close(1);
125 (void)open("/dev/null", O_RDWR);
126 (void)close(2);
127 (void)open("/dev/null", O_RDWR);
128 (void)close(pdes[1]);
129 }
130#if WANT_GLOBBING
131 execvp(gargv[0], gargv);
132#else
133 execvp(argv[0], argv);
134#endif
135 _exit(1);
136 }
137 /* parent; assume fdopen can't fail... */
138 if (*type == 'r') {
139 iop = fdopen(pdes[0], type);
140 (void)close(pdes[1]);
141 } else {
142 iop = fdopen(pdes[1], type);
143 (void)close(pdes[0]);
144 }
145 pids[fileno(iop)] = pid;
146
147pfree:
148#if WANT_GLOBBING
149 for (argc = 1; argv[argc] != NULL; argc++) {
150/* blkfree((char **)argv[argc]); */
151 free((char *)argv[argc]);
152 }
153#endif
154 return(iop);
155}
156
157int
158cron_pclose(iop)
159 FILE *iop;
160{
161 register int fdes;
162 int omask;
163 WAIT_T stat_loc;
164 PID_T pid;
165
166 /*
167 * pclose returns -1 if stream is not associated with a
168 * `popened' command, or, if already `pclosed'.
169 */
170 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
171 return(-1);
172 (void)fclose(iop);
173 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
174 while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
175 ;
176 (void)sigsetmask(omask);
177 pids[fdes] = 0;
178 return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
179}
| 32#endif /* not lint */
33
34#include "cron.h"
35#include <sys/signal.h>
36#include <fcntl.h>
37
38
39#define MAX_ARGS 100
40#define WANT_GLOBBING 0
41
42/*
43 * Special version of popen which avoids call to shell. This insures noone
44 * may create a pipe to a hidden program as a side effect of a list or dir
45 * command.
46 */
47static PID_T *pids;
48static int fds;
49
50FILE *
51cron_popen(program, type)
52 char *program, *type;
53{
54 register char *cp;
55 FILE *iop;
56 int argc, pdes[2];
57 PID_T pid;
58 char *argv[MAX_ARGS + 1];
59#if WANT_GLOBBING
60 char **pop, *vv[2];
61 int gargc;
62 char *gargv[1000];
63 extern char **glob(), **copyblk();
64#endif
65
66 if ((*type != 'r' && *type != 'w') || type[1])
67 return(NULL);
68
69 if (!pids) {
70 if ((fds = getdtablesize()) <= 0)
71 return(NULL);
72 if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
73 return(NULL);
74 bzero((char *)pids, fds * sizeof(PID_T));
75 }
76 if (pipe(pdes) < 0)
77 return(NULL);
78
79 /* break up string into pieces */
80 for (argc = 0, cp = program; argc < MAX_ARGS; cp = NULL)
81 if (!(argv[argc++] = strtok(cp, " \t\n")))
82 break;
83
84#if WANT_GLOBBING
85 /* glob each piece */
86 gargv[0] = argv[0];
87 for (gargc = argc = 1; argv[argc]; argc++) {
88 if (!(pop = glob(argv[argc]))) { /* globbing failed */
89 vv[0] = argv[argc];
90 vv[1] = NULL;
91 pop = copyblk(vv);
92 }
93 argv[argc] = (char *)pop; /* save to free later */
94 while (*pop && gargc < 1000)
95 gargv[gargc++] = *pop++;
96 }
97 gargv[gargc] = NULL;
98#endif
99
100 iop = NULL;
101 switch(pid = vfork()) {
102 case -1: /* error */
103 (void)close(pdes[0]);
104 (void)close(pdes[1]);
105 goto pfree;
106 /* NOTREACHED */
107 case 0: /* child */
108 if (*type == 'r') {
109 /* Do not share our parent's stdin */
110 (void)close(0);
111 (void)open("/dev/null", O_RDWR);
112 if (pdes[1] != 1) {
113 dup2(pdes[1], 1);
114 dup2(pdes[1], 2); /* stderr, too! */
115 (void)close(pdes[1]);
116 }
117 (void)close(pdes[0]);
118 } else {
119 if (pdes[0] != 0) {
120 dup2(pdes[0], 0);
121 (void)close(pdes[0]);
122 }
123 /* Hack: stdout gets revoked */
124 (void)close(1);
125 (void)open("/dev/null", O_RDWR);
126 (void)close(2);
127 (void)open("/dev/null", O_RDWR);
128 (void)close(pdes[1]);
129 }
130#if WANT_GLOBBING
131 execvp(gargv[0], gargv);
132#else
133 execvp(argv[0], argv);
134#endif
135 _exit(1);
136 }
137 /* parent; assume fdopen can't fail... */
138 if (*type == 'r') {
139 iop = fdopen(pdes[0], type);
140 (void)close(pdes[1]);
141 } else {
142 iop = fdopen(pdes[1], type);
143 (void)close(pdes[0]);
144 }
145 pids[fileno(iop)] = pid;
146
147pfree:
148#if WANT_GLOBBING
149 for (argc = 1; argv[argc] != NULL; argc++) {
150/* blkfree((char **)argv[argc]); */
151 free((char *)argv[argc]);
152 }
153#endif
154 return(iop);
155}
156
157int
158cron_pclose(iop)
159 FILE *iop;
160{
161 register int fdes;
162 int omask;
163 WAIT_T stat_loc;
164 PID_T pid;
165
166 /*
167 * pclose returns -1 if stream is not associated with a
168 * `popened' command, or, if already `pclosed'.
169 */
170 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
171 return(-1);
172 (void)fclose(iop);
173 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
174 while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
175 ;
176 (void)sigsetmask(omask);
177 pids[fdes] = 0;
178 return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
179}
|