Define sethostname on platforms that do not provide the declaration.
Provide a function for platforms that lack it. The general handling
of the provided function is to simply return -1 and set errno to
ENOSYS. A handler is provided for Minix.
Signed-off-by: Ben Walton <bwal...@artsci.utoronto.ca>
---
doc/glibc-functions/sethostname.texi | 11 +++++-
lib/sethostname.c | 71 ++++++++++++++++++++++++++++++++++
m4/sethostname.m4 | 21 ++++++++++
modules/sethostname | 32 +++++++++++++++
4 files changed, 134 insertions(+), 1 deletions(-)
create mode 100644 lib/sethostname.c
create mode 100644 m4/sethostname.m4
create mode 100644 modules/sethostname
diff --git a/doc/glibc-functions/sethostname.texi
b/doc/glibc-functions/sethostname.texi
index 75cc8ca..7960eda 100644
--- a/doc/glibc-functions/sethostname.texi
+++ b/doc/glibc-functions/sethostname.texi
@@ -2,10 +2,15 @@
@subsection @code{sethostname}
@findex sethostname
-Gnulib module: ---
+Gnulib module: sethostname
Portability problems fixed by Gnulib:
@itemize
+@item
+On AIX 7.1, OSF/1 5.1 and Solaris 10 the declaration is missing. On
+Minix 3.1.8, Cygwin, mingw, MSVC 9, Interix 3.5, BeOS the function is
+missing. Provide a fallback for all platforms that returns -1 and
+sets ENOSYS. Provide a specific implementation for Minix 3.1.8
@end itemize
Portability problems not fixed by Gnulib:
@@ -16,4 +21,8 @@ Minix 3.1.8, Cygwin, mingw, MSVC 9, Interix 3.5, BeOS.
@item
This function is not declared on some platforms:
AIX 7.1, OSF/1 5.1, Solaris 10.
+@item
+On Solaris 10, the first argument is @code{char *} instead of
+@code{const char *} and the second parameter is @code{int} instead of
+@code{size_t}.
@end itemize
diff --git a/lib/sethostname.c b/lib/sethostname.c
new file mode 100644
index 0000000..70d5955
--- /dev/null
+++ b/lib/sethostname.c
@@ -0,0 +1,71 @@
+/* sethostname emulation for glibc compliance.
+
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Ben Walton <bwal...@artsci.utoronto.ca> */
+
+#include <config.h>
+
+/* Unix API. */
+
+/* Specification. */
+#include <unistd.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+
+/* Set up to LEN chars of NAME as system hostname.
+ Return 0 if ok, -1 if error. */
+
+int
+sethostname (const char *name, size_t len)
+{
+ /* glibc seems to allow a zero length hostname: bail on names that
+ are too long or too short */
+ if (len < 0 || len > HOST_NAME_MAX)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* NAME does not need to be null terminated so leave room to terminate
+ regardless of input. */
+ char hostname[len + 1];
+ strncpy(hostname, name, len);
+ hostname[len] = '\0';
+
+#ifdef __minix /* Minix */
+ FILE *hostf;
+
+ /* leave errno alone in this case as it will provide a more useful error
+ indication than overriding with ENOSYS */
+ if ((hostf = fopen("/etc/hostname.file", "w")) == NULL)
+ return -1;
+ else
+ {
+ fprintf(hostf, "%s\n", hostname);
+ fclose(hostf);
+ return 0;
+ }
+#else
+ /* For platforms that we don't have a better option for, simply bail
+ out */
+ errno = ENOSYS;
+ return -1;
+#endif
+}
diff --git a/m4/sethostname.m4 b/m4/sethostname.m4
new file mode 100644
index 0000000..dbdbb39
--- /dev/null
+++ b/m4/sethostname.m4
@@ -0,0 +1,21 @@
+# sethostname.m4 serial 1
+dnl Copyright (C) 2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Ensure
+# - the sethostname() function,
+AC_DEFUN([gl_FUNC_SETHOSTNAME],
+[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+ AC_REPLACE_FUNCS([sethostname])
+ AC_CHECK_DECLS([sethostname])
+ if test $ac_cv_func_sethostname = no; then
+ gl_PREREQ_HOST_NAME_MAX
+ fi
+ if test $ac_cv_have_decl_sethostname = no; then
+ HAVE_DECL_SETHOSTNAME=0
+ fi
+])
diff --git a/modules/sethostname b/modules/sethostname
new file mode 100644
index 0000000..a0f36a2
--- /dev/null
+++ b/modules/sethostname
@@ -0,0 +1,32 @@
+Description:
+sethostname() function: Set machine's hostname.
+
+Files:
+lib/sethostname.c
+m4/sethostname.m4
+
+Depends-on:
+unistd
+gethostname
+errno [test $HAVE_SETHOSTNAME = 0]
+
+configure.ac:
+gl_FUNC_SETHOSTNAME
+if test $HAVE_SETHOSTNAME = 0; then
+ AC_LIBOBJ([sethostname])
+fi
+gl_UNISTD_MODULE_INDICATOR([sethostname])
+
+Makefile.am:
+
+Include:
+<unistd.h>
+
+Link:
+$(SETHOSTNAME_LIB)
+
+License:
+LGPLv2+
+
+Maintainer:
+Ben Walton
--
1.7.4.1
