1 files changed, 119 insertions, 0 deletions
diff --git a/lib/util/system.c b/lib/util/system.c
new file mode 100644
index 0000000000..9bf5de1a83
--- /dev/null
+++ b/lib/util/system.c
@@ -0,0 +1,119 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba system utilities
+   Copyright (C) Andrew Tridgell 1992-1998
+   Copyright (C) Jeremy Allison 1998-2002
+   
+   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/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "system/filesys.h"
+
+/*
+   The idea is that this file will eventually have wrappers around all
+   important system calls in samba. The aims are:
+
+   - to enable easier porting by putting OS dependent stuff in here
+
+   - to allow for hooks into other "pseudo-filesystems"
+
+   - to allow easier integration of things like the japanese extensions
+
+   - to support the philosophy of Samba to expose the features of
+     the OS within the SMB model. In general whatever file/printer/variable
+     expansions/etc make sense to the OS should be acceptable to Samba.
+*/
+
+/**************************************************************************
+A wrapper for gethostbyname() that tries avoids looking up hostnames 
+in the root domain, which can cause dial-on-demand links to come up for no
+apparent reason.
+****************************************************************************/
+
+_PUBLIC_ struct hostent *sys_gethostbyname(const char *name)
+{
+#ifdef REDUCE_ROOT_DNS_LOOKUPS
+	char query[256], hostname[256];
+	char *domain;
+
+	/* Does this name have any dots in it? If so, make no change */
+
+	if (strchr(name, '.'))
+		return(gethostbyname(name));
+
+	/* Get my hostname, which should have domain name 
+		attached. If not, just do the gethostname on the
+		original string. 
+	*/
+
+	gethostname(hostname, sizeof(hostname) - 1);
+	hostname[sizeof(hostname) - 1] = 0;
+	if ((domain = strchr(hostname, '.')) == NULL)
+		return(gethostbyname(name));
+
+	/* Attach domain name to query and do modified query.
+		If names too large, just do gethostname on the
+		original string.
+	*/
+
+	if((strlen(name) + strlen(domain)) >= sizeof(query))
+		return(gethostbyname(name));
+
+	slprintf(query, sizeof(query)-1, "%s%s", name, domain);
+	return(gethostbyname(query));
+#else /* REDUCE_ROOT_DNS_LOOKUPS */
+	return(gethostbyname(name));
+#endif /* REDUCE_ROOT_DNS_LOOKUPS */
+}
+
+_PUBLIC_ struct in_addr sys_inet_makeaddr(int net, int host)
+{
+	struct in_addr in;
+	struct in_addr in2;
+	in = inet_makeaddr(net, host);
+	in2.s_addr = in.s_addr;
+	return in2;
+}
+
+/**************************************************************************
+ Wrapper for fork. Ensures we clear our pid cache.
+****************************************************************************/
+
+static pid_t mypid = (pid_t)-1;
+
+_PUBLIC_ pid_t sys_fork(void)
+{
+	pid_t forkret = fork();
+
+	if (forkret == (pid_t)0) {
+		/* Child - reset mypid so sys_getpid does a system call. */
+		mypid = (pid_t) -1;
+	}
+
+	return forkret;
+}
+
+/**************************************************************************
+ Wrapper for getpid. Ensures we only do a system call *once*.
+****************************************************************************/
+
+_PUBLIC_ pid_t sys_getpid(void)
+{
+	if (mypid == (pid_t)-1)
+		mypid = getpid();
+
+	return mypid;
+}