Update copyright dates with scripts/update-copyrights.

[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / gethostid.c

diff --git a/sysdeps/unix/sysv/linux/gethostid.c b/sysdeps/unix/sysv/linux/gethostid.c
index f2ebbf2b6ad807ac11c5c7b43a757649825ded5a..73e5c76091544c8e157a2163c34b25756194e57e 100644 (file)
--- a/sysdeps/unix/sysv/linux/gethostid.c
+++ b/sysdeps/unix/sysv/linux/gethostid.c
@@ -1,35 +1,36 @@
-/* Copyright (C) 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
+/* Copyright (C) 1995-2016 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   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
-   Library General Public License for more details.
+   Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Library General Public
-   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.  */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
 #include <alloca.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <netdb.h>
+#include <not-cancel.h>
 
-#define HOSTIDFILE "/var/adm/hostid"
+#define HOSTIDFILE "/etc/hostid"
 
 #ifdef SET_PROCEDURE
 int
-sethostid (id)
-     long int id;
+sethostid (long int id)
 {
   int fd;
   ssize_t written;
+  int32_t id32 = id;
 
   /* Test for appropriate rights to set host ID.  */
   if (__libc_enable_secure)
@@ -38,16 +39,23 @@ sethostid (id)
       return -1;
     }
 
+  /* Make sure the ID is not too large.  Needed for bi-arch support.   */
+  if (id32 != id)
+    {
+      __set_errno (EOVERFLOW);
+      return -1;
+    }
+
   /* Open file for writing.  Everybody is allowed to read this file.  */
-  fd = __open (HOSTIDFILE, O_CREAT|O_WRONLY, 0644);
+  fd = open_not_cancel (HOSTIDFILE, O_CREAT|O_WRONLY|O_TRUNC, 0644);
   if (fd < 0)
     return -1;
 
-  written = __write (fd, &id, sizeof (id));
+  written = write_not_cancel (fd, &id32, sizeof (id32));
 
-  __close (fd);
+  close_not_cancel_no_status (fd);
 
-  return written != sizeof (id) ? -1 : 0;
+  return written != sizeof (id32) ? -1 : 0;
 }
 
 #else
@@ -57,24 +65,24 @@ sethostid (id)
 # include <netinet/in.h>
 
 long int
-gethostid ()
+gethostid (void)
 {
   char hostname[MAXHOSTNAMELEN + 1];
   size_t buflen;
   char *buffer;
   struct hostent hostbuf, *hp;
-  unsigned long int id;
+  int32_t id;
   struct in_addr in;
   int herr;
   int fd;
 
   /* First try to get the ID from a former invocation of sethostid.  */
-  fd = __open (HOSTIDFILE, O_RDONLY);
+  fd = open_not_cancel (HOSTIDFILE, O_RDONLY|O_LARGEFILE, 0);
   if (fd >= 0)
     {
-      ssize_t n = __read (fd, &id, sizeof (id));
+      ssize_t n = read_not_cancel (fd, &id, sizeof (id));
 
-      __close (fd);
+      close_not_cancel_no_status (fd);
 
       if (n == sizeof (id))
        return id;
@@ -91,22 +99,20 @@ gethostid ()
 
   /* To get the IP address we need to know the host name.  */
   while (__gethostbyname_r (hostname, &hostbuf, buffer, buflen, &hp, &herr)
-        != 0)
+        != 0
+        || hp == NULL)
     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,
-         (int) sizeof (in) < hp->h_length ? sizeof (in) : hp->h_length);
+         (int) sizeof (in) < hp->h_length ? (int) sizeof (in) : hp->h_length);
 
   /* For the return value to be not exactly the IP address we do some
      bit fiddling.  */
-  return in.s_addr << 16 | in.s_addr >> 16;
+  return (int32_t) (in.s_addr << 16 | in.s_addr >> 16);
 }
 #endif