Update.

	* sysdeps/generic/utmp_file.c: Use not-cancelable syscalls all
	over the place.  It would be allowed to have these fucntions as
	cancellation points but the cleanup would be ugly and a lot of
	work.

	* sysdeps/generic/not-cancel.h (fcntl_not_cancel): Define.
	* sysdeps/unix/sysv/linux/not-cancel.h (fcntl_not_cancel): Define.

	* include/fcntl.h (__fcntl_nocancel): Declare.
	* sysdeps/unix/sysv/linux/fcntl.c: New file.
	* sysdeps/unix/sysv/linux/i386/fcntl.c (__libc_fcntl): Only enable
	cancellation if absolutely needed.
	(__fcntl_nocancel): Define.

	* posix/unistd.h (gethostid): Remove __THROW.  Clarify comment.
	* sysdeps/unix/sysv/linux/Makefile (CFLAGS-gethostid.c): Add
	-fexceptions.
	* sysdeps/unix/sysv/linux/gethostid.c (gethostid): Use
	extend_alloca.

	* resolv/res_init.c (__res_nclose): Use close_not_cancel_no_status
	instead of __close.

7 files changed, 135 insertions, 63 deletions

diff --git a/sysdeps/generic/not-cancel.h b/sysdeps/generic/not-cancel.h
index 2bea378..396e042 100644
--- a/sysdeps/generic/not-cancel.h
+++ b/sysdeps/generic/not-cancel.h
@@ -33,5 +33,7 @@
   __write (fd, buf, n)
 #define writev_not_cancel_no_status(fd, iov, n) \
   (void) __writev (fd, iov, n)
+#define fcntl_not_cancel(fd, cmd, val) \
+  __fcntl (fd, cmd, val)
 # define waitpid_not_cancel(pid, stat_loc, options) \
   __waitpid (pid, stat_loc, options)
diff --git a/sysdeps/generic/utmp_file.c b/sysdeps/generic/utmp_file.c
index 6502ac3..dc31e64 100644
--- a/sysdeps/generic/utmp_file.c
+++ b/sysdeps/generic/utmp_file.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996,97,98,99,2000,01,02 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2002, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>
    and Paul Janzen <pcj@primenet.com>, 1996.
@@ -26,6 +26,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <utmp.h>
+#include <not-cancel.h>
 
 #include "utmp-private.h"
 #include "utmp-equal.h"
@@ -57,47 +58,47 @@ static void timeout_handler (int signum) {};
      LOCK_FILE.
  */
 #define LOCK_FILE(fd, type) \
-{                                                                       \
-  struct flock fl;                                                      \
-  struct sigaction action, old_action;                                  \
-  unsigned int old_timeout;                                             \
-                                                                        \
-  /* Cancel any existing alarm.  */                                     \
-  old_timeout = alarm (0);                                              \
-                                                                        \
-  /* Establish signal handler.  */                                      \
-  action.sa_handler = timeout_handler;                                  \
-  __sigemptyset (&action.sa_mask);                                      \
-  action.sa_flags = 0;                                                  \
-  __sigaction (SIGALRM, &action, &old_action);                          \
-                                                                        \
-  alarm (TIMEOUT);                                                      \
-                                                                        \
-  /* Try to get the lock.  */                                           \
-  memset (&fl, '\0', sizeof (struct flock));                            \
-  fl.l_type = (type);                                                   \
-  fl.l_whence = SEEK_SET;                                               \
-  if (__fcntl ((fd), F_SETLKW, &fl) < 0)
+{									      \
+  struct flock fl;							      \
+  struct sigaction action, old_action;					      \
+  unsigned int old_timeout;						      \
+									      \
+  /* Cancel any existing alarm.  */					      \
+  old_timeout = alarm (0);						      \
+									      \
+  /* Establish signal handler.  */					      \
+  action.sa_handler = timeout_handler;					      \
+  __sigemptyset (&action.sa_mask);					      \
+  action.sa_flags = 0;							      \
+  __sigaction (SIGALRM, &action, &old_action);				      \
+									      \
+  alarm (TIMEOUT);							      \
+									      \
+  /* Try to get the lock.  */						      \
+  memset (&fl, '\0', sizeof (struct flock));				      \
+  fl.l_type = (type);							      \
+  fl.l_whence = SEEK_SET;						      \
+  if (__fcntl_nocancel ((fd), F_SETLKW, &fl) < 0)
 
 #define LOCKING_FAILED() \
   goto unalarm_return
 
 #define UNLOCK_FILE(fd) \
-  /* Unlock the file.  */                                               \
-  fl.l_type = F_UNLCK;                                                  \
-  __fcntl ((fd), F_SETLKW, &fl);                                        \
-                                                                        \
- unalarm_return:							\
-  /* Reset the signal handler and alarm.  We must reset the alarm	\
-     before resetting the handler so our alarm does not generate a	\
-     spurious SIGALRM seen by the user.  However, we cannot just set	\
-     the user's old alarm before restoring the handler, because then	\
-     it's possible our handler could catch the user alarm's SIGARLM	\
-     and then the user would never see the signal he expected.  */	\
-  alarm (0);								\
-  __sigaction (SIGALRM, &old_action, NULL);                             \
-  if (old_timeout != 0)							\
-    alarm (old_timeout);                                                \
+  /* Unlock the file.  */						      \
+  fl.l_type = F_UNLCK;							      \
+  __fcntl_nocancel ((fd), F_SETLKW, &fl);				      \
+									      \
+ unalarm_return:							      \
+  /* Reset the signal handler and alarm.  We must reset the alarm	      \
+     before resetting the handler so our alarm does not generate a	      \
+     spurious SIGALRM seen by the user.  However, we cannot just set	      \
+     the user's old alarm before restoring the handler, because then	      \
+     it's possible our handler could catch the user alarm's SIGARLM	      \
+     and then the user would never see the signal he expected.  */	      \
+  alarm (0);								      \
+  __sigaction (SIGALRM, &old_action, NULL);				      \
+  if (old_timeout != 0)							      \
+    alarm (old_timeout);						      \
 } while (0)
 
 
@@ -139,22 +140,22 @@ setutent_file (void)
 
       file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
 
-      file_fd = __open (file_name, O_RDWR);
+      file_fd = open_not_cancel_2 (file_name, O_RDWR);
       if (file_fd == -1)
 	{
 	  /* Hhm, read-write access did not work.  Try read-only.  */
-	  file_fd = __open (file_name, O_RDONLY);
+	  file_fd = open_not_cancel_2 (file_name, O_RDONLY);
 	  if (file_fd == -1)
 	    return 0;
 	}
 
       /* We have to make sure the file is `closed on exec'.  */
-      result = __fcntl (file_fd, F_GETFD, 0);
+      result = __fcntl_nocancel (file_fd, F_GETFD, 0);
       if (result >= 0)
-	result = __fcntl (file_fd, F_SETFD, result | FD_CLOEXEC);
+	result = __fcntl_nocancel (file_fd, F_SETFD, result | FD_CLOEXEC);
       if (result == -1)
 	{
-	  __close (file_fd);
+	  close_not_cancel_no_status (file_fd);
 	  return 0;
 	}
     }
@@ -197,7 +198,7 @@ getutent_r_file (struct utmp *buffer, struct utmp **result)
     }
 
   /* Read the next entry.  */
-  nbytes = __read (file_fd, &last_entry, sizeof (struct utmp));
+  nbytes = read_not_cancel (file_fd, &last_entry, sizeof (struct utmp));
 
   UNLOCK_FILE (file_fd);
 
@@ -237,7 +238,7 @@ internal_getut_r (const struct utmp *id, struct utmp *buffer)
       while (1)
 	{
 	  /* Read the next entry.  */
-	  if (__read (file_fd, buffer, sizeof (struct utmp))
+	  if (read_not_cancel (file_fd, buffer, sizeof (struct utmp))
 	      != sizeof (struct utmp))
 	    {
 	      __set_errno (ESRCH);
@@ -259,7 +260,7 @@ internal_getut_r (const struct utmp *id, struct utmp *buffer)
       while (1)
 	{
 	  /* Read the next entry.  */
-	  if (__read (file_fd, buffer, sizeof (struct utmp))
+	  if (read_not_cancel (file_fd, buffer, sizeof (struct utmp))
 	      != sizeof (struct utmp))
 	    {
 	      __set_errno (ESRCH);
@@ -332,7 +333,7 @@ getutline_r_file (const struct utmp *line, struct utmp *buffer,
   while (1)
     {
       /* Read the next entry.  */
-      if (__read (file_fd, &last_entry, sizeof (struct utmp))
+      if (read_not_cancel (file_fd, &last_entry, sizeof (struct utmp))
 	  != sizeof (struct utmp))
 	{
 	  __set_errno (ESRCH);
@@ -418,7 +419,8 @@ pututline_file (const struct utmp *data)
     }
 
   /* Write the new data.  */
-  if (__write (file_fd, data, sizeof (struct utmp)) != sizeof (struct utmp))
+  if (write_not_cancel (file_fd, data, sizeof (struct utmp))
+      != sizeof (struct utmp))
     {
       /* If we appended a new record this is only partially written.
 	 Remove it.  */
@@ -444,7 +446,7 @@ endutent_file (void)
 {
   assert (file_fd >= 0);
 
-  __close (file_fd);
+  close_not_cancel_no_status (file_fd);
   file_fd = -1;
 }
 
@@ -457,7 +459,7 @@ updwtmp_file (const char *file, const struct utmp *utmp)
   int fd;
 
   /* Open WTMP file.  */
-  fd = __open (file, O_WRONLY);
+  fd = open_not_cancel_2 (file, O_WRONLY);
   if (fd < 0)
     return -1;
 
@@ -478,7 +480,8 @@ updwtmp_file (const char *file, const struct utmp *utmp)
   /* 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.  */
-  if (__write (fd, utmp, sizeof (struct utmp)) != sizeof (struct utmp))
+  if (write_not_cancel (fd, utmp, sizeof (struct utmp))
+      != sizeof (struct utmp))
     {
       __ftruncate64 (fd, offset);
       goto unlock_return;
@@ -490,7 +493,7 @@ unlock_return:
   UNLOCK_FILE (fd);
 
   /* Close WTMP file.  */
-  __close (fd);
+  close_not_cancel_no_status (fd);
 
   return result;
 }
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index f292931..2d781d2 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -15,6 +15,8 @@ ifeq ($(subdir),misc)
 sysdep_routines += sysctl clone llseek umount umount2 readahead \
 		   setfsuid setfsgid
 
+CFLAGS-gethostid.c = -fexceptions
+
 sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 		  sys/klog.h sys/kdaemon.h \
 		  sys/user.h sys/procfs.h sys/prctl.h \
diff --git a/sysdeps/unix/sysv/linux/fcntl.c b/sysdeps/unix/sysv/linux/fcntl.c
new file mode 100644
index 0000000..33651d3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fcntl.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+
+#include <sysdep-cancel.h>
+#include <sys/syscall.h>
+
+
+int
+__fcntl_nocancel (int fd, int cmd, void *arg)
+{
+  return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+}
+
+
+int
+__libc_fcntl (int fd, int cmd, ...)
+{
+  va_list ap;
+  void *arg;
+
+  va_start (ap, cmd);
+  arg = va_arg (ap, void *);
+  va_end (ap);
+
+  if (SINGLE_THREAD_P || cmd != F_SETLKW)
+    return __fcntl_nocancel (fd, cmd, arg);
+
+  int oldtype = LIBC_CANCEL_ASYNC ();
+
+  int result = __fcntl_nocancel (fd, cmd, arg);
+
+  LIBC_CANCEL_RESET (oldtype);
+
+  return result;
+}
+libc_hidden_def (__libc_fcntl)
+
+weak_alias (__libc_fcntl, __fcntl)
+libc_hidden_weak (__fcntl)
+weak_alias (__libc_fcntl, fcntl)
diff --git a/sysdeps/unix/sysv/linux/gethostid.c b/sysdeps/unix/sysv/linux/gethostid.c
index 5ef330b..c7f8940 100644
--- a/sysdeps/unix/sysv/linux/gethostid.c
+++ b/sysdeps/unix/sysv/linux/gethostid.c
@@ -101,11 +101,8 @@ gethostid ()
     if (herr != NETDB_INTERNAL || errno != ERANGE)
       return 0;
     else
-      {
-	/* Enlarge buffer.  */
-	buflen *= 2;
-	buffer = __alloca (buflen);
-      }
+      /* Enlarge buffer.  */
+      buffer = extend_alloca (buffer, buflen, 2 * buflen);
 
   in.s_addr = 0;
   memcpy (&in, hp->h_addr,
diff --git a/sysdeps/unix/sysv/linux/i386/fcntl.c b/sysdeps/unix/sysv/linux/i386/fcntl.c
index 749288d..c0ca125 100644
--- a/sysdeps/unix/sysv/linux/i386/fcntl.c
+++ b/sysdeps/unix/sysv/linux/i386/fcntl.c
@@ -28,11 +28,13 @@
 #if __ASSUME_FCNTL64 == 0
 /* This variable is shared with all files that check for fcntl64.  */
 int __have_no_fcntl64;
+#endif
 
 
-static int
-do_fcntl (int fd, int cmd, void *arg)
+int
+__fcntl_nocancel (int fd, int cmd, void *arg)
 {
+#if __ASSUME_FCNTL64 == 0
 # ifdef __NR_fcntl64
   if (! __have_no_fcntl64)
     {
@@ -113,8 +115,10 @@ do_fcntl (int fd, int cmd, void *arg)
       return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
     }
   return -1;
+#else
+  return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
+#endif  /* !__ASSUME_FCNTL64  */
 }
-#endif  /* __ASSUME_FCNTL64  */
 
 
 int
@@ -128,19 +132,19 @@ __libc_fcntl (int fd, int cmd, ...)
   va_end (ap);
 
 #if __ASSUME_FCNTL64 > 0
-  if (SINGLE_THREAD_P)
+  if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64))
     return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
 
   int oldtype = LIBC_CANCEL_ASYNC ();
 
   int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
 #else
-  if (SINGLE_THREAD_P)
-    return do_fcntl (fd, cmd, arg);
+  if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64))
+    return __fcntl_nocancel (fd, cmd, arg);
 
   int oldtype = LIBC_CANCEL_ASYNC ();
 
-  int result = do_fcntl (fd, cmd, arg);
+  int result = __fcntl_nocancel (fd, cmd, arg);
 #endif
 
   LIBC_CANCEL_RESET (oldtype);
diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h
index c716419..9418417 100644
--- a/sysdeps/unix/sysv/linux/not-cancel.h
+++ b/sysdeps/unix/sysv/linux/not-cancel.h
@@ -46,6 +46,10 @@
   (void) ({ INTERNAL_SYSCALL_DECL (err);				      \
 	    INTERNAL_SYSCALL (writev, err, 3, (fd), (iov), (n)); })
 
+/* Uncancelable fcntl.  */
+#define fcntl_not_cancel(fd, cmd, val) \
+  __fcntl_nocancel (fd, cmd, val)
+
 /* Uncancelable waitpid.  */
 #ifdef __NR_waitpid
 # define waitpid_not_cancel(pid, stat_loc, options) \