popen.c (51295a4d3e4c551df85249433c490208dc7fd23d) popen.c (662909a7800d5634772b89ca1509765dda837508)
1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. 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, with or without

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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#if defined(LIBC_SCCS) && !defined(lint)
1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. 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, with or without

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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#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)popen.c 8.1 (Berkeley) 6/4/93";
38static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 5/3/95";
39#endif /* LIBC_SCCS and not lint */
40
41#include <sys/param.h>
42#include <sys/wait.h>
39#endif /* LIBC_SCCS and not lint */
40
41#include <sys/param.h>
42#include <sys/wait.h>
43#include <sys/socket.h>
43
44#include <signal.h>
45#include <errno.h>
46#include <unistd.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <paths.h>
51
52static struct pid {
53 struct pid *next;
54 FILE *fp;
55 pid_t pid;
44
45#include <signal.h>
46#include <errno.h>
47#include <unistd.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <paths.h>
52
53static struct pid {
54 struct pid *next;
55 FILE *fp;
56 pid_t pid;
56} *pidlist;
57
57} *pidlist;
58
58FILE *
59FILE *
59popen(program, type)
60 const char *program;
61 const char *type;
60popen(command, type)
61 const char *command, *type;
62{
63 struct pid *cur;
64 FILE *iop;
62{
63 struct pid *cur;
64 FILE *iop;
65 int pdes[2], pid;
65 int pdes[2], pid, twoway;
66
66
67 if ( (*type != 'r' && *type != 'w') || type[1])
68 return (NULL);
67 if (strchr(type, '+')) {
68 twoway = 1;
69 type = "r+";
70 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
71 return (NULL);
72 } else {
73 twoway = 0;
74 if (*type != 'r' && *type != 'w' || type[1] ||
75 (pipe(pdes) < 0))
76 return (NULL);
77 }
69
70 if ((cur = malloc(sizeof(struct pid))) == NULL)
71 return (NULL);
72
78
79 if ((cur = malloc(sizeof(struct pid))) == NULL)
80 return (NULL);
81
73 if (pipe(pdes) < 0) {
74 free(cur);
75 return (NULL);
76 }
77
78 switch (pid = vfork()) {
79 case -1: /* Error. */
80 (void)close(pdes[0]);
81 (void)close(pdes[1]);
82 switch (pid = vfork()) {
83 case -1: /* Error. */
84 (void)close(pdes[0]);
85 (void)close(pdes[1]);
82 free(cur);
86 (void)free(cur);
83 return (NULL);
84 /* NOTREACHED */
85 case 0: /* Child. */
86 if (*type == 'r') {
87 if (pdes[1] != STDOUT_FILENO) {
88 (void)dup2(pdes[1], STDOUT_FILENO);
89 (void)close(pdes[1]);
87 return (NULL);
88 /* NOTREACHED */
89 case 0: /* Child. */
90 if (*type == 'r') {
91 if (pdes[1] != STDOUT_FILENO) {
92 (void)dup2(pdes[1], STDOUT_FILENO);
93 (void)close(pdes[1]);
94 pdes[1] = STDOUT_FILENO;
90 }
91 (void) close(pdes[0]);
95 }
96 (void) close(pdes[0]);
97 if (twoway && (pdes[1] != STDIN_FILENO))
98 (void)dup2(pdes[1], STDIN_FILENO);
92 } else {
93 if (pdes[0] != STDIN_FILENO) {
94 (void)dup2(pdes[0], STDIN_FILENO);
95 (void)close(pdes[0]);
96 }
97 (void)close(pdes[1]);
98 }
99 } else {
100 if (pdes[0] != STDIN_FILENO) {
101 (void)dup2(pdes[0], STDIN_FILENO);
102 (void)close(pdes[0]);
103 }
104 (void)close(pdes[1]);
105 }
99 execl(_PATH_BSHELL, "sh", "-c", program, NULL);
106 execl(_PATH_BSHELL, "sh", "-c", command, NULL);
100 _exit(127);
101 /* NOTREACHED */
102 }
103
104 /* Parent; assume fdopen can't fail. */
105 if (*type == 'r') {
106 iop = fdopen(pdes[0], type);
107 (void)close(pdes[1]);

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125 * if already `pclosed', or waitpid returns an error.
126 */
127int
128pclose(iop)
129 FILE *iop;
130{
131 register struct pid *cur, *last;
132 int omask;
107 _exit(127);
108 /* NOTREACHED */
109 }
110
111 /* Parent; assume fdopen can't fail. */
112 if (*type == 'r') {
113 iop = fdopen(pdes[0], type);
114 (void)close(pdes[1]);

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132 * if already `pclosed', or waitpid returns an error.
133 */
134int
135pclose(iop)
136 FILE *iop;
137{
138 register struct pid *cur, *last;
139 int omask;
133 union wait pstat;
140 int pstat;
134 pid_t pid;
135
141 pid_t pid;
142
136 (void)fclose(iop);
137
138 /* Find the appropriate file pointer. */
139 for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
140 if (cur->fp == iop)
141 break;
142 if (cur == NULL)
143 return (-1);
144
143 /* Find the appropriate file pointer. */
144 for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
145 if (cur->fp == iop)
146 break;
147 if (cur == NULL)
148 return (-1);
149
145 /* Get the status of the process. */
146 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
150 (void)fclose(iop);
151
147 do {
152 do {
148 pid = waitpid(cur->pid, (int *) &pstat, 0);
153 pid = waitpid(cur->pid, &pstat, 0);
149 } while (pid == -1 && errno == EINTR);
154 } while (pid == -1 && errno == EINTR);
150 (void)sigsetmask(omask);
151
152 /* Remove the entry from the linked list. */
153 if (last == NULL)
154 pidlist = cur->next;
155 else
156 last->next = cur->next;
157 free(cur);
155
156 /* Remove the entry from the linked list. */
157 if (last == NULL)
158 pidlist = cur->next;
159 else
160 last->next = cur->next;
161 free(cur);
158
159 return (pid == -1 ? -1 : pstat.w_status);
162
163 return (pid == -1 ? -1 : pstat);
160}
164}