update from main archive 961214cvs/libc-961215

Sun Dec 15 01:53:20 1996  Ulrich Drepper  <drepper@cygnus.com>

	* Makefile (subdirs): Change crypt to md5-crypt.
	* crypt/Makefile, crypt/md5-crypt.c, crypt/md5.c, crypt/md5.h,
	crypt/md5c-test.c, crypt/md5test.c: Move to new directory
	md5-crypt.
	* sysdeps/unix/sysv/linux/configure.in: Refer to linuxthreads and
	crypt instead of LinuxThreads and des-crypt.

	* Makefile (subdirs): Add nss back.
	* sysdeps/unix/inet/Subdirs: Move nis to end of file to fulfill
	dependencies.

	* libio/iofclose.c: Implement fclose(NULL) as closing all streams.
	* stdio-common/Makefile (routines): Add fcloseall.
	* stdio-common/fcloseall.c: New file.
	* sysdeps/generic/abort.c: Make implementation POSIX.1 compatible.

	* sysdeps/mach/libc-lock.h: Add definition of __libc_lock_trylock.
	* sysdeps/stub/libc-lock.h: Define __libc_lock_trylock to always
	return 0.

	* stdio-common/printf.h: Define MIN and MAX only if not already
	defined.

	* stdio-common/vfprintf.c: Set errno to EBADF if stream does not
	allow writing.  Required by POSIX.1.

	* libio/libioP.h (CHECK_FILE): Use MAYBE_SET_EINVAL instead of
	assignment.

	* interp.c: Update copyright.
	* libio/clearerr.c: Likewise.
	* libio/ioseekoff.c: Likewise.
	* libio/ioseekpos.c: Likewise.
	* stdio/fclose.c: Likewise.
	* stdio/fflus.c: Likewise.

	* libio/libio.h [!_IO_MTSAFE_IO]: Define _IO_cleanup_region_start
	and _IO_cleanup_region_end as empty.
	* libio/fgetc.c: Use _IO_cleanup_region_start and
	_IO_cleanup_region_end instead of __libc_cleanup_region_start and
	__libc_cleanup_region_end.
	* libio/fputc.c: Likewise.
	* libio/freopen.c: Likewise.
	* libio/fseek.c: Likewise.
	* libio/getc.c: Likewise.
	* libio/getchar.c: Likewise.
	* libio/iofclose.c: Likewise.
	* libio/iofflush.c: Likewise.
	* libio/iofgetpos.c: Likewise.
	* libio/iofgets.c: Likewise.
	* libio/iofputs.c: Likewise.
	* libio/iofread.c: Likewise.
	* libio/iofsetpos.c: Likewise.
	* libio/ioftell.c: Likewise.
	* libio/iofwrite.c: Likewise.
	* libio/iogetdelim.c: Likewise.
	* libio/iogets.c: Likewise.
	* libio/ioputs.c: Likewise.
	* libio/iosetbuffer.c: Likewise.
	* libio/iosetvbuf.c: Likewise.
	* libio/ioungetc.c: Likewise.

	* libio/iovspintf.c: Use cleanup handler to make sure no dangling
	locks can stay over.
	* libio/iovsscanf.c: Likewise.

	* libio/genops.c: Use _IO_lock_init_recursive and _IO_lock_fini
	instead of __libc_lock_init_recursive and __libc_lock_fini.

	* libio/filedoalloc.c: Only use __isatty when compiling GNU libc.
	Otherwise use isatty.
	* libio/fileops.c: Likewise for __open and open.

	* login/utmp_file.c (getutent_r_file): Use fcntl instead of
	flock.

	* nis/ypclnt.h: Add more casts to prevent warnings.

	* nss/Makefile (services): Remove dns.
	(libnss_dns, libnss_dns-inhibit-o): Remove definition.
	($(objpfx)libnss_dns.so): Removed.
	* nss/nss_dns/dns-host.c, nss/nss_dns/dns-network.c: Moved to...
	* resolv/nss_dns: ...here.
	* resolv/Makefile (extra-libs): Add libnss_dns.
	(libnss_dns-routines, libnss_dns-inhibit-o): Define as in
	nss/Makefile.

	* nss/XXX-lookup.c: Call __nss_database_lookup with new argument
	specifying alternate name for entry in /etc/nsswitch.conf
	* nss/nsswitch.c: If no entry with primary name is found in
	/etc/nsswitch.conf try alternate name if given.
	* nss/nsswitch.h: Add new parameter in prototype for
	__nss_database_lookup.
	* nss/spwd-lookup.c: Provide alternative entry name to look for.
	This makes our NSS compatible with Solaris' nsswitch.conf files.

	* string/tst-strlen.c: Change all counting variables to type size_t
	to prevent warnings.

	* sysdeps/posix/fpathconf.c: Update copyright.
	* sysdeps/posix/pathconf.c: Don't call fpathconf to do the work.
	Opening the file at this path may fail if it is a FIFO or pipe.

	These changes make the time implementation POSIX.1 compliant.
	* time/localtime.c (__localtime_r): Always call __tzset not only
	if __tzset_run is zero.
	* time/strftime.c: Add definition of memset_space to help to
	reduce for systems which have memset.
	(strftime): Don't use tm_zone member of argument for zone name.
	Instead always use tzname[].
	Call tzset() as required by POSIX.1 before any action.
	* time/tzset.c (tzset): Set tzname[] as required by POSIX.1.
	Remove global variable __tzset_run.  __tzset is now called always
	when a dependent function is used.
	(__tzset): Caching happens based on the contents of the
	environment variable TZ.

Fri Dec 13 01:06:52 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/paths.h: Add _PATH_KLOG.

Thu Dec 12 09:16:35 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* rellns-sh: Correctly handle a relative source file name.

Wed Dec 11 19:18:40 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* login/utmp_file.c (setutent_file): Seek back to beginning of the
	file if resetting.

Thu Dec 12 16:39:12 1996  Thomas Bushnell, n/BSG  <thomas@gnu.ai.mit.edu>

	* hurd/hurdinit.c (map0): Delete function.  Don't do this on
	_hurd_preinit_hook.
	* hurd/hurdstartup.c (_hurd_startup): Map page zero redzone here.

1 files changed, 39 insertions, 26 deletions

diff --git a/time/tzset.c b/time/tzset.c
index 954cec2e87..6a9ebe1f82 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -74,7 +74,7 @@ static tz_rule tz_rules[2];
 
 static int compute_change __P ((tz_rule *rule, int year));
 
-int __tzset_run = 0;
+static char *old_tz = NULL;
 
 /* Interpret the TZ envariable.  */
 void
@@ -85,6 +85,20 @@ __tzset ()
   unsigned short int hh, mm, ss;
   unsigned short int whichrule;
 
+  /* Examine the TZ environment variable.  */
+  tz = getenv ("TZ");
+
+  /* A leading colon means "implementation defined syntax".
+     We ignore the colon and always use the same algorithm:
+     try a data file, and if none exists parse the 1003.1 syntax.  */
+  if (tz && *tz == ':')
+    ++tz;
+
+  /* Check whether the value changes since the last run.  */
+  if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0)
+    /* No change, simply return.  */
+    return;
+
   /* Free old storage.  */
   if (tz_rules[0].name != NULL && *tz_rules[0].name != '\0')
     {
@@ -98,22 +112,15 @@ __tzset ()
       tz_rules[1].name = NULL;
     }
 
-  /* Examine the TZ environment variable.  */
-  tz = getenv ("TZ");
-
-  /* A leading colon means "implementation defined syntax".
-     We ignore the colon and always use the same algorithm:
-     try a data file, and if none exists parse the 1003.1 syntax.  */
-  if (tz && *tz == ':')
-    ++tz;
+  /* Save the value of `tz'.  */
+  if (old_tz != NULL)
+    free (old_tz);
+  old_tz = tz ? __strdup (tz) : NULL;
 
   /* Try to read a data file.  */
   __tzfile_read (tz);
   if (__use_tzfile)
-    {
-      __tzset_run = 1;
-      return;
-    }
+    return;
 
   /* No data file found.  Default to UTC if nothing specified.  */
 
@@ -121,10 +128,10 @@ __tzset ()
     {
       static const char UTC[] = "UTC";
       size_t len = sizeof UTC;
-      tz_rules[0].name = (char *) malloc(len);
+      tz_rules[0].name = (char *) malloc (len);
       if (tz_rules[0].name == NULL)
 	return;
-      tz_rules[1].name = (char *) malloc(len);
+      tz_rules[1].name = (char *) malloc (len);
       if (tz_rules[1].name == NULL)
 	return;
       memcpy ((void *) tz_rules[0].name, UTC, len);
@@ -136,7 +143,6 @@ __tzset ()
       tz_rules[0].offset = tz_rules[1].offset = 0L;
       tz_rules[0].change = tz_rules[1].change = (time_t) -1;
       tz_rules[0].computed_for = tz_rules[1].computed_for = 0;
-      __tzset_run = 1;
       return;
     }
 
@@ -147,8 +153,12 @@ __tzset ()
   /* Get the standard timezone name.  */
   tz_rules[0].name = (char *) malloc (strlen (tz) + 1);
   if (tz_rules[0].name == NULL)
-    /* Don't set __tzset_run so we will try again.  */
-    return;
+    {
+      /* Clear the old tz name so we will try again.  */
+      free (old_tz);
+      old_tz = NULL;
+      return;
+    }
 
   if (sscanf(tz, "%[^0-9,+-]", tz_rules[0].name) != 1 ||
       (l = strlen(tz_rules[0].name)) < 3)
@@ -257,7 +267,8 @@ __tzset ()
 			tz_rules[0].offset, tz_rules[1].offset);
       if (__use_tzfile)
 	{
-	  __tzset_run = 1;
+	  free (old_tz);
+	  old_tz = NULL;
 	  return;
 	}
     }
@@ -353,8 +364,6 @@ __tzset ()
 
       tzr->computed_for = -1;
     }
-
-  __tzset_run = 1;
 }
 
 /* Maximum length of a timezone name.  __tz_compute keeps this up to date
@@ -365,8 +374,7 @@ size_t __tzname_cur_max;
 long int
 __tzname_max ()
 {
-  if (! __tzset_run)
-    __tzset ();
+  __tzset ();
 
   return __tzname_cur_max;
 }
@@ -450,7 +458,7 @@ compute_change (rule, year)
   /* T is now the Epoch-relative time of 0:00:00 GMT on the day we want.
      Just add the time of day and local offset from GMT, and we're done.  */
 
-  rule->change = t + rule->offset + rule->secs;
+  rule->change = t - rule->offset + rule->secs;
   rule->computed_for = year;
   return 1;
 }
@@ -464,8 +472,7 @@ __tz_compute (timer, tm)
      time_t timer;
      const struct tm *tm;
 {
-  if (! __tzset_run)
-    __tzset ();
+  __tzset ();
 
   if (! compute_change (&tz_rules[0], 1900 + tm->tm_year) ||
       ! compute_change (&tz_rules[1], 1900 + tm->tm_year))
@@ -504,6 +511,12 @@ weak_function
 tzset (void)
 {
   __libc_lock_lock (__tzset_lock);
+
   __tzset ();
+
+  /* Set `tzname'.  */
+  __tzname[0] = (char *) tz_rules[0].name;
+  __tzname[1] = (char *) tz_rules[1].name;
+
   __libc_lock_unlock (__tzset_lock);
 }