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uucplock.c (116344) uucplock.c (121193)
1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/lib/libutil/uucplock.c 116344 2003-06-14 18:42:37Z markm $");
35__FBSDID("$FreeBSD: head/lib/libutil/uucplock.c 121193 2003-10-18 10:04:16Z markm $");
36
37#ifndef lint
38static const char sccsid[] = "@(#)uucplock.c 8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40
41#include <sys/types.h>
42#include <sys/file.h>
43#include <dirent.h>

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62static int put_pid (int fd, pid_t pid);
63static pid_t get_pid (int fd,int *err);
64
65/*
66 * uucp style locking routines
67 */
68
69int
36
37#ifndef lint
38static const char sccsid[] = "@(#)uucplock.c 8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40
41#include <sys/types.h>
42#include <sys/file.h>
43#include <dirent.h>

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62static int put_pid (int fd, pid_t pid);
63static pid_t get_pid (int fd,int *err);
64
65/*
66 * uucp style locking routines
67 */
68
69int
70uu_lock(const char *ttyname)
70uu_lock(const char *tty_name)
71{
72 int fd, tmpfd, i;
73 pid_t pid, pid_old;
74 char lckname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN],
75 lcktmpname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
76 int err, uuerr;
77
78 pid = getpid();
79 (void)snprintf(lcktmpname, sizeof(lcktmpname), _PATH_UUCPLOCK LOCKTMP,
80 pid);
81 (void)snprintf(lckname, sizeof(lckname), _PATH_UUCPLOCK LOCKFMT,
71{
72 int fd, tmpfd, i;
73 pid_t pid, pid_old;
74 char lckname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN],
75 lcktmpname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
76 int err, uuerr;
77
78 pid = getpid();
79 (void)snprintf(lcktmpname, sizeof(lcktmpname), _PATH_UUCPLOCK LOCKTMP,
80 pid);
81 (void)snprintf(lckname, sizeof(lckname), _PATH_UUCPLOCK LOCKFMT,
82 ttyname);
82 tty_name);
83 if ((tmpfd = creat(lcktmpname, 0664)) < 0)
84 GORET(0, UU_LOCK_CREAT_ERR);
85
86 for (i = 0; i < MAXTRIES; i++) {
87 if (link (lcktmpname, lckname) < 0) {
88 if (errno != EEXIST)
89 GORET(1, UU_LOCK_LINK_ERR);
90 /*

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124 (void)close(tmpfd);
125 (void)unlink(lcktmpname);
126ret0:
127 errno = err;
128 return uuerr;
129}
130
131int
83 if ((tmpfd = creat(lcktmpname, 0664)) < 0)
84 GORET(0, UU_LOCK_CREAT_ERR);
85
86 for (i = 0; i < MAXTRIES; i++) {
87 if (link (lcktmpname, lckname) < 0) {
88 if (errno != EEXIST)
89 GORET(1, UU_LOCK_LINK_ERR);
90 /*

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124 (void)close(tmpfd);
125 (void)unlink(lcktmpname);
126ret0:
127 errno = err;
128 return uuerr;
129}
130
131int
132uu_lock_txfr(const char *ttyname, pid_t pid)
132uu_lock_txfr(const char *tty_name, pid_t pid)
133{
134 int fd, err;
135 char lckname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
136
133{
134 int fd, err;
135 char lckname[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
136
137 snprintf(lckname, sizeof(lckname), _PATH_UUCPLOCK LOCKFMT, ttyname);
137 snprintf(lckname, sizeof(lckname), _PATH_UUCPLOCK LOCKFMT, tty_name);
138
139 if ((fd = open(lckname, O_RDWR)) < 0)
140 return UU_LOCK_OWNER_ERR;
141 if (get_pid(fd, &err) != getpid())
142 err = UU_LOCK_OWNER_ERR;
143 else {
138
139 if ((fd = open(lckname, O_RDWR)) < 0)
140 return UU_LOCK_OWNER_ERR;
141 if (get_pid(fd, &err) != getpid())
142 err = UU_LOCK_OWNER_ERR;
143 else {
144 lseek(fd, 0, SEEK_SET);
144 lseek(fd, (off_t)0, SEEK_SET);
145 err = put_pid(fd, pid) ? 0 : UU_LOCK_WRITE_ERR;
146 }
147 close(fd);
148
149 return err;
150}
151
152int
145 err = put_pid(fd, pid) ? 0 : UU_LOCK_WRITE_ERR;
146 }
147 close(fd);
148
149 return err;
150}
151
152int
153uu_unlock(const char *ttyname)
153uu_unlock(const char *tty_name)
154{
155 char tbuf[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
156
154{
155 char tbuf[sizeof(_PATH_UUCPLOCK) + MAXNAMLEN];
156
157 (void)snprintf(tbuf, sizeof(tbuf), _PATH_UUCPLOCK LOCKFMT, ttyname);
157 (void)snprintf(tbuf, sizeof(tbuf), _PATH_UUCPLOCK LOCKFMT, tty_name);
158 return unlink(tbuf);
159}
160
161const char *
162uu_lockerr(int uu_lockresult)
163{
164 static char errbuf[128];
158 return unlink(tbuf);
159}
160
161const char *
162uu_lockerr(int uu_lockresult)
163{
164 static char errbuf[128];
165 char *fmt;
165 const char *fmt;
166
167 switch (uu_lockresult) {
168 case UU_LOCK_INUSE:
169 return "device in use";
170 case UU_LOCK_OK:
171 return "";
172 case UU_LOCK_OPEN_ERR:
173 fmt = "open error: %s";

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201
202static int
203put_pid(int fd, pid_t pid)
204{
205 char buf[32];
206 int len;
207
208 len = sprintf (buf, "%10d\n", (int)pid);
166
167 switch (uu_lockresult) {
168 case UU_LOCK_INUSE:
169 return "device in use";
170 case UU_LOCK_OK:
171 return "";
172 case UU_LOCK_OPEN_ERR:
173 fmt = "open error: %s";

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201
202static int
203put_pid(int fd, pid_t pid)
204{
205 char buf[32];
206 int len;
207
208 len = sprintf (buf, "%10d\n", (int)pid);
209 return write (fd, buf, len) == len;
209 return write (fd, buf, (size_t)len) == len;
210}
211
212static pid_t
213get_pid(int fd, int *err)
214{
215 int bytes_read;
216 char buf[32];
217 pid_t pid;
218
219 bytes_read = read (fd, buf, sizeof (buf) - 1);
220 if (bytes_read > 0) {
221 buf[bytes_read] = '\0';
210}
211
212static pid_t
213get_pid(int fd, int *err)
214{
215 int bytes_read;
216 char buf[32];
217 pid_t pid;
218
219 bytes_read = read (fd, buf, sizeof (buf) - 1);
220 if (bytes_read > 0) {
221 buf[bytes_read] = '\0';
222 pid = strtol (buf, (char **) NULL, 10);
222 pid = (pid_t)strtol (buf, (char **) NULL, 10);
223 } else {
224 pid = -1;
225 *err = bytes_read ? errno : EINVAL;
226 }
227 return pid;
228}
229
230/* end of uucplock.c */
223 } else {
224 pid = -1;
225 *err = bytes_read ? errno : EINVAL;
226 }
227 return pid;
228}
229
230/* end of uucplock.c */