Thu Jul 18 04:33:21 1996 Roland McGrath <roland@baalperazim.frob.com> cvs/libc-960718

	* sysdeps/mach/hurd/errnos.awk: Move EWOULDBLOCK check before errno==0
	check.  mib's clueless hacking broke it.

Thu Jul 18 04:27:21 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

	* Makerules ($(libdir)/libc.so): Add missing / after $(cryptobjdir).

Wed Jul 17 10:54:20 1996  David Mosberger-Tang  <davidm@azstarnet.com>

	* sysdeps/unix/sysv/linux/alpha/start.S: Move to ...
	* sysdeps/alpha/elf/start.S: here.

	* misc/sys/ustat.h: New file.
	* misc/ustat.h: Ditto.
	* sysdeps/generic/ustatbits.h: Ditto.
	* libc-orig/sysdeps/stub/ustat.c: Ditto.
	* sysdeps/unix/sysv/linux/ustatbits.h: Ditto.
	* misc/Makefile (headers): Mention ustat.h, sys/ustat.h, and
 	ustatbits.h.
	(routines): Mention ustat.

	* sysdeps/unix/sysv/linux/syscalls.list: Mention klogctl in
 	alphabetically correct place.  Mention ustat.

	* sysdeps/unix/alpha/sysdep.S: Make errno a bss symbol, not a
	common symbol (makes errno accessible from gdb).

	* login/pututline_r.c (pututline_r): Test ut_id in repositioning
	test, not ut_type.

	* login/logwtmp.c (logwtmp): Reimplemented.  Must ensure that a
 	record always gets appended at end of file (wtmp is a log file,
 	after all).  Set ut_type to DEAD_PROCESS if name is empty.

	* login/getutid_r.c (getutid_r): Handle search for UT_TYPE in
	separate loop from search for UT_ID.  Fix code so it is in
	sync with Unix man page.

	* login/getutline_r.c (getutline_r): Stop searching only if
 	ut_line matches and type is either USER_PROCESS or LOGIN_PROCESS.

Tue Jul 16 15:06:18 1996  David Mosberger-Tang  <davidm@azstarnet.com>

	* sysdeps/unix/sysv/linux/netinet/in.h: Base on <linux/in.h> to
 	avoid duplicate declarations.

Sun Jul 14 19:08:55 1996  David Mosberger-Tang  <davidm@azstarnet.com>

	* manual/maint.texi (Supported Configurations): Add alpha-gnu-linux
	and alpha-gnu-linuxecoff targets.

Fri Jul 12 16:58:44 1996  David Mosberger-Tang  <davidm@azstarnet.com>

	* sysdeps/unix/sysv/linux/netinet/in.h: Declare bindresvport().

Sat Jun 22 23:30:07 1996  David Mosberger-Tang  <davidm@azstarnet.com>

	* resolv/res_send.c (res_send): Declare FROMLEN as size_t instead
	of int.

	* resolv/res_comp.c (res_hnok): Use empty statement in place
	of NULL (which generates a "useless expression" warning in
	gcc).

1 files changed, 41 insertions, 21 deletions

diff --git a/login/logwtmp.c b/login/logwtmp.c
index 371f34ee76..2ae6a68dca 100644
--- a/login/logwtmp.c
+++ b/login/logwtmp.c
@@ -17,33 +17,31 @@ License along with the GNU C Library; see the file COPYING.LIB.  If
 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
+#include <errno.h>
 #include <string.h>
 #include <unistd.h>
 #include <utmp.h>
-
+#include <sys/file.h>
+#include <sys/stat.h>
 
 void
 logwtmp (const char *line, const char *name, const char *host)
 {
-  struct utmp_data data;
   struct utmp ut;
+  struct stat st;
+  size_t written;
+  int fd;
 
-  /* Tell that we want to use the UTMP file.  */
-  if (utmpname (_PATH_WTMP) == 0)
-    return;
-
-  /* Open UTMP file.  */
-  setutent_r (&data);
-
-  /* Position at end of file.  */
-  data.loc_utmp = lseek (data.ut_fd, 0, SEEK_END);
-  if (data.loc_utmp == -1)
-    return;
+  /* Open WTMP file.  */
+  fd = __open (_PATH_WTMP, O_WRONLY | O_APPEND);
+  if (fd < 0)
+      return;
 
   /* Set information in new entry.  */
-  bzero (&ut, sizeof (ut));
+  memset (&ut, 0, sizeof (ut));
+  ut.ut_pid = getpid ();
 #if _HAVE_UT_TYPE - 0
-  ut.ut_type = USER_PROCESS;
+  ut.ut_type = name[0] ? USER_PROCESS : DEAD_PROCESS;
 #endif
   strncpy (ut.ut_line, line, sizeof ut.ut_line);
   strncpy (ut.ut_name, name, sizeof ut.ut_name);
@@ -52,14 +50,36 @@ logwtmp (const char *line, const char *name, const char *host)
 #endif
 
 #if _HAVE_UT_TV - 0
-  gettimeofday (&ut.ut_tv, NULL);
+  __gettimeofday (&ut.ut_tv, NULL);
 #else
-  time (&ut.ut_time);
+  __time (&ut.ut_time);
 #endif
 
-  /* Write the entry.  */
-  pututline_r (&ut, &data);
+  /* Try to lock the file.  */
+  if (__flock (fd, LOCK_EX | LOCK_NB) < 0 && errno != ENOSYS)
+    {
+      /* Oh, oh.  The file is already locked.  Wait a bit and try again.  */
+      sleep (1);
+
+      /* This time we ignore the error.  */
+      __flock (fd, LOCK_EX | LOCK_NB);
+    }
+
+  /* Remeber original size of log file: */
+  if (__fstat (fd, &st) < 0)
+    goto done;
+
+  /* Write the entry.  If we can't write all the bytes, reset the file
+     size back to the original size.  That way, no partial entries
+     will remain.  */
+  written = __write (fd, &ut, sizeof (ut));
+  if (written > 0 && written != sizeof (ut))
+    ftruncate (fd, st.st_size);
+
+done:
+  /* And unlock the file.  */
+  __flock (fd, LOCK_UN);
 
-  /* Close UTMP file.  */
-  endutent_r (&data);
+  /* Close WTMP file.  */
+  __close (fd);
 }