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authorUlrich Drepper <drepper@redhat.com>1995-09-08 17:02:25 +0000
committerUlrich Drepper <drepper@redhat.com>1995-09-08 17:02:25 +0000
commitd2f5be2a1235061b46c51d7530264d086eca46ef (patch)
tree486fbdc7e9d3f2417c26242e36894a54ea6c90a8 /sysdeps/unix/sysv/linux/gethostid.c
parentd586354e51250d2aaf83149cf7d15f81e276f038 (diff)
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Document new files for Linux i386/ELF port.
Fri Sep 8 16:32:12 1995 Ulrich Drepper <drepper@gnu.ai.mit.edu> * sysdeps/unix/sysv/linux/Implies, sysdeps/unix/sysv/linux/Makefile, sysdeps/unix/sysv/linux/Subdirs, sysdeps/unix/sysv/linux/accept.S, sysdeps/unix/sysv/linux/adjtime.c, sysdeps/unix/sysv/linux/adjtimex.S, sysdeps/unix/sysv/linux/bind.S, sysdeps/unix/sysv/linux/connect.S, sysdeps/unix/sysv/linux/direct.h, sysdeps/unix/sysv/linux/dl-machine.h, sysdeps/unix/sysv/linux/errnos.h, sysdeps/unix/sysv/linux/fork.S, sysdeps/unix/sysv/linux/gethostid.c, sysdeps/unix/sysv/linux/gethostname.C, sysdeps/unix/sysv/linux/getpeername.S, sysdeps/unix/sysv/linux/getpgid.S, sysdeps/unix/sysv/linux/getpgrp.S, sysdeps/unix/sysv/linux/getsockname.S, sysdeps/unix/sysv/linux/getsockopt.S, sysdeps/unix/sysv/linux/gtty.S, sysdeps/unix/sysv/linux/listen.S, sysdeps/unix/sysv/linux/local_lim.h, sysdeps/unix/sysv/linux/madvise.c, sysdeps/unix/sysv/linux/msgctl.c, sysdeps/unix/sysv/linux/msgget.c, sysdeps/unix/sysv/linux/msgrcv.c, sysdeps/unix/sysv/linux/msgsnd.c, sysdeps/unix/sysv/linux/pipe.S, sysdeps/unix/sysv/linux/poll.c, sysdeps/unix/sysv/linux/readv.c, sysdeps/unix/sysv/linux/recv.S, sysdeps/unix/sysv/linux/recvfrom.S, sysdeps/unix/sysv/linux/recvmsg.S, sysdeps/unix/sysv/linux/semctl.c, sysdeps/unix/sysv/linux/semget.c, sysdeps/unix/sysv/linux/semop.c, sysdeps/unix/sysv/linux/send.S, sysdeps/unix/sysv/linux/sendmsg.S, sysdeps/unix/sysv/linux/sendto.S, sysdeps/unix/sysv/linux/setegid.c, sysdeps/unix/sysv/linux/seteuid.c, sysdeps/unix/sysv/linux/sethostid.c, sysdeps/unix/sysv/linux/setpgid.c, sysdeps/unix/sysv/linux/setpgrp.c, sysdeps/unix/sysv/linux/setsid.S, sysdeps/unix/sysv/linux/setsockopt.S, sysdeps/unix/sysv/linux/settimeofday.S, sysdeps/unix/sysv/linux/shmat.c, sysdeps/unix/sysv/linux/shmctl.c, sysdeps/unix/sysv/linux/shmdt.c, sysdeps/unix/sysv/linux/shmget.c, sysdeps/unix/sysv/linux/shutdown.S, sysdeps/unix/sysv/linux/sigaction.S, sysdeps/unix/sysv/linux/signal.S, sysdeps/unix/sysv/linux/sigpending.S, sysdeps/unix/sysv/linux/sigset.h, sysdeps/unix/sysv/linux/sockaddrcom.h, sysdeps/unix/sysv/linux/socketpair.S, sysdeps/unix/sysv/linux/speed.c, sysdeps/unix/sysv/linux/statbuf.h, sysdeps/unix/sysv/linux/stty.S, sysdeps/unix/sysv/linux/syscall.h, sysdeps/unix/sysv/linux/sysconf.c, sysdeps/unix/sysv/linux/tcdrain.c, sysdeps/unix/sysv/linux/tcflow.c, sysdeps/unix/sysv/linux/tcflush.c, sysdeps/unix/sysv/linux/tcgetattr.c, sysdeps/unix/sysv/linux/tcsetattr.c, sysdeps/unix/sysv/linux/termbits.h, sysdeps/unix/sysv/linux/ualarm.c, sysdeps/unix/sysv/linux/ulimit.c, sysdeps/unix/sysv/linux/usleep.c, sysdeps/unix/sysv/linux/utsnamelen.h, sysdeps/unix/sysv/linux/vfork.c, sysdeps/unix/sysv/linux/wait.c, sysdeps/unix/sysv/linux/wait4.S, sysdeps/unix/sysv/linux/waitpid.c, sysdeps/unix/sysv/linux/writev.c: New Linux/ELF specific, architecture independent files. sysdeps/unix/sysv/linux/i386/Dist, sysdeps/unix/sysv/linux/i386/Makefile, sysdeps/unix/sysv/linux/i386/brk.S, sysdeps/unix/sysv/linux/i386/fcntlbits.h, sysdeps/unix/sysv/linux/i386/fpu_control.c, sysdeps/unix/sysv/linux/i386/fpu_control.h, sysdeps/unix/sysv/linux/i386/fstat.S, sysdeps/unix/sysv/linux/i386/fxstat.S, sysdeps/unix/sysv/linux/i386/ieee_fpu.c, sysdeps/unix/sysv/linux/i386/init-first.S, sysdeps/unix/sysv/linux/i386/ipc.S, sysdeps/unix/sysv/linux/i386/lstat.S, sysdeps/unix/sysv/linux/i386/lxstat.S, sysdeps/unix/sysv/linux/i386/mknod.S, sysdeps/unix/sysv/linux/i386/mmap.S, sysdeps/unix/sysv/linux/i386/sbrk.S, sysdeps/unix/sysv/linux/i386/setfpucw.c, sysdeps/unix/sysv/linux/i386/signum.h, sysdeps/unix/sysv/linux/i386/socket.S, sysdeps/unix/sysv/linux/i386/stat.S, sysdeps/unix/sysv/linux/i386/syscall.S, sysdeps/unix/sysv/linux/i386/sysdep.S, sysdeps/unix/sysv/linux/i386/sysdep.h, sysdeps/unix/sysv/linux/i386/xmknod.S, sysdeps/unix/sysv/linux/i386/xstat.S: New Linux i386/ELF specific files. sysdeps/unix/sysv/linux/sys/ipc_buf.h, sysdeps/unix/sysv/linux/sys/mman.h, sysdeps/unix/sysv/linux/sys/msq_buf.h, sysdeps/unix/sysv/linux/sys/sem_buf.h, sysdeps/unix/sysv/linux/sys/shm_buf.h, sysdeps/unix/sysv/linux/sys/socketcall.h, sysdeps/unix/sysv/linux/sys/timex.h: New Linux/ELF specific, architecture independent header files.
Diffstat (limited to 'sysdeps/unix/sysv/linux/gethostid.c')
-rw-r--r--sysdeps/unix/sysv/linux/gethostid.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/gethostid.c b/sysdeps/unix/sysv/linux/gethostid.c
new file mode 100644
index 0000000000..94f4a1ece7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/gethostid.c
@@ -0,0 +1,96 @@
+/* Copyright (C) 1995 Free Software Foundation, Inc.
+
+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.
+
+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.
+
+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. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#define HOSTIDFILE "/var/adm/hostid"
+
+#ifdef SET_PROCEDURE
+int
+sethostid (id)
+ long int id;
+{
+ int fd;
+ ssize_t written;
+
+ /* Test for appropriate rights to set host ID. */
+ if (geteuid () || getuid ())
+ {
+ errno = EPERM;
+ return -1;
+ }
+
+ /* Open file for writing. Everybody is allowed to read this file. */
+ fd = __open (HOSTIDFILE, O_CREAT|O_WRONLY, 0644);
+ if (fd < 0)
+ return -1;
+
+ written = __write (fd, &id, sizeof (id));
+
+ __close (fd);
+
+ return written != sizeof (id) ? -1 : 0;
+}
+
+#else
+# include <sys/param.h>
+# include <resolv/netdb.h>
+# include <netinet/in.h>
+
+long int
+gethostid ()
+{
+ char hostname[MAXHOSTNAMELEN + 1];
+ struct hostent *hp;
+ unsigned long id;
+ struct in_addr in;
+ int fd;
+
+ /* First try to get the ID from a former invocation of sethostid. */
+ fd = __open (HOSTIDFILE, O_RDONLY);
+ if (fd >= 0)
+ {
+ ssize_t n = __read (fd, &id, sizeof (id));
+
+ __close (fd);
+
+ if (n == sizeof (id))
+ return id;
+ }
+
+ /* Getting from the file was not succesful. An intelligent guess for
+ a unique number of a host is its IP address. Return this. */
+ if (gethostname (hostname, MAXHOSTNAMELEN) < 0 || hostname[0] == '\0')
+ /* This also fails. Return and arbitrary value. */
+ return 0;
+
+ /* To get the IP address we need to knoe the host name. */
+ hp = gethostbyname (hostname);
+ if (hp == NULL)
+ return 0;
+
+ in.s_addr = 0;
+ memcpy (&in, hp->h_addr,
+ sizeof (in) < hp->h_length ? 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;
+}
+#endif