Some cleanups so utmp/wtmp behaves. Fix potential use of

uninitialized memory.  Prepare to reentrantify the utmp
stuff.
 -Erik

1 files changed, 60 insertions, 0 deletions

diff --git a/libc/misc/utmp/wtent.c b/libc/misc/utmp/wtent.c
new file mode 100644
index 000000000..ef5663feb
--- /dev/null
+++ b/libc/misc/utmp/wtent.c
@@ -0,0 +1,60 @@
+/* wtmp support rubbish (i.e. complete crap)
+ *
+ * Written by Erik Andersen <andersee@debian.org> 
+ *
+ * This library is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU Library General Public License as 
+ * published by the Free Software Foundation; either version 2 of the 
+ * License, or (at your option) any later version.  
+ *
+ * This library is distributed in the hope that it will be useful, 
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
+ * Library General Public License for more details.  
+ *
+ * You should have received a copy of the GNU Library General Public 
+ * License along with this library; see the file COPYING.LIB.  If not, 
+ * write to the Free Software Foundation, Inc., 675 Mass Ave, 
+ * Cambridge, MA 02139, USA.  */
+
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+#include <utmp.h>
+#include <fcntl.h>
+#include <sys/file.h>
+
+
+#if 0
+/* This is enabled in uClibc/libutil/logwtmp.c */
+void logwtmp (const char *line, const char *name, const char *host)
+{
+    struct utmp lutmp;
+    memset (&(lutmp), 0, sizeof (struct utmp));
+
+    lutmp.ut_type = (name && *name)? USER_PROCESS : DEAD_PROCESS;
+    lutmp.ut_pid = getpid();
+    strncpy(lutmp.ut_line, line, sizeof(lutmp.ut_line)-1);
+    strncpy(lutmp.ut_name, name, sizeof(lutmp.ut_name)-1);
+    strncpy(lutmp.ut_host, host, sizeof(lutmp.ut_host)-1);
+    gettimeofday(&(lutmp.ut_tv), NULL);
+
+    updwtmp(_PATH_WTMP, &(lutmp));
+}
+#endif
+
+extern void updwtmp(const char *wtmp_file, const struct utmp *lutmp)
+{
+    int fd;
+
+    fd = open(wtmp_file, O_APPEND | O_WRONLY, 0);
+    if (fd >= 0) {
+	if (lockf(fd, F_LOCK, 0)==0) {
+	    write(fd, (const char *) lutmp, sizeof(struct utmp));
+	    lockf(fd, F_ULOCK, 0);
+	    close(fd);
+	}
+    }
+}
+