Implemented logwtmp(), lock() and unlock().

diff --git a/pppd/sys-svr4.c b/pppd/sys-svr4.c
index df74afe7b823bb1dfd2b63868fec4e47098ae2b5..cff5851d5f0ae77c9c5cadedb8cf8d16489c8f73 100644 (file)
--- a/pppd/sys-svr4.c
+++ b/pppd/sys-svr4.c
@@ -26,7 +26,7 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: sys-svr4.c,v 1.5 1995/08/11 02:36:24 paulus Exp $";
+static char rcsid[] = "$Id: sys-svr4.c,v 1.6 1995/08/16 01:40:51 paulus Exp $";
 #endif
 
 #include <stdio.h>
@@ -38,6 +38,7 @@ static char rcsid[] = "$Id: sys-svr4.c,v 1.5 1995/08/11 02:36:24 paulus Exp $";
 #include <unistd.h>
 #include <termios.h>
 #include <signal.h>
+#include <utmpx.h>
 #include <sys/types.h>
 #include <sys/ioccom.h>
 #include <sys/stream.h>
@@ -48,6 +49,7 @@ static char rcsid[] = "$Id: sys-svr4.c,v 1.5 1995/08/11 02:36:24 paulus Exp $";
 #include <sys/systeminfo.h>
 #include <sys/dlpi.h>
 #include <sys/stat.h>
+#include <sys/mkdev.h>
 #include <net/if.h>
 #include <net/if_arp.h>
 #include <net/route.h>
@@ -1167,6 +1169,21 @@ int
 logwtmp(line, name, host)
     char *line, *name, *host;
 {
+    static struct utmpx utmpx;
+
+    if (name[0] != 0) {
+       /* logging in */
+       strncpy(utmpx.ut_user, name, sizeof(utmpx.ut_user));
+       strncpy(utmpx.ut_id, ifname, sizeof(utmpx.ut_id));
+       strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line));
+       utmpx.ut_pid = getpid();
+       utmpx.ut_type = USER_PROCESS;
+    } else {
+       utmpx.ut_type = DEAD_PROCESS;
+    }
+    gettimeofday(&utmpx.ut_tv, NULL);
+    updwtmpx("/var/adm/wtmpx", &utmpx);
+    return 0;
 }
 
 /*
@@ -1203,15 +1220,80 @@ strioctl(fd, cmd, ptr, ilen, olen)
     return 0;
 }
 
+/*
+ * lock - create a lock file for the named lock device
+ *
+ * XXX Does anybody know what the "032" in the lock file name means?
+ */
+
+#define LOCK_PREFIX    "/var/spool/locks/LK.032."
+static char lock_file[40];     /* name of lock file created */
+
 int
 lock(dev)
     char *dev;
 {
+    int n, fd, pid;
+    struct stat sbuf;
+    char ascii_pid[12];
+
+    if (stat(dev, &sbuf) < 0) {
+       syslog(LOG_ERR, "Can't get device number for %s: %m", dev);
+       return -1;
+    }
+    if ((sbuf.st_mode & S_IFMT) != S_IFCHR) {
+       syslog(LOG_ERR, "Can't lock %s: not a character device", dev);
+       return -1;
+    }
+    sprintf(lock_file, "%s%03d.%03d", LOCK_PREFIX, major(sbuf.st_rdev),
+           minor(sbuf.st_rdev));
+
+    while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
+       if (errno == EEXIST
+           && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
+           /* Read the lock file to find out who has the device locked */
+           n = read(fd, ascii_pid, 11);
+           if (n <= 0) {
+               syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
+               close(fd);
+           } else {
+               ascii_pid[n] = 0;
+               pid = atoi(ascii_pid);
+               if (pid > 0 && kill(pid, 0) == -1 && errno == ESRCH) {
+                   /* pid no longer exists - remove the lock file */
+                   if (unlink(lock_file) == 0) {
+                       close(fd);
+                       syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
+                              dev, pid);
+                       continue;
+                   } else
+                       syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
+                              dev);
+               } else
+                   syslog(LOG_NOTICE, "Device %s is locked by pid %d",
+                          dev, pid);
+           }
+           close(fd);
+       } else
+           syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
+       lock_file[0] = 0;
+       return -1;
+    }
+
+    sprintf(ascii_pid, "%10d\n", getpid());
+    write(fd, ascii_pid, 11);
+
+    close(fd);
     return 1;
 }
 
-int
+/*
+ * unlock - remove our lockfile
+ */
 unlock()
 {
-    return 1;
+    if (lock_file[0]) {
+       unlink(lock_file);
+       lock_file[0] = 0;
+    }
 }