tidying: char signedness

[exim.git] / src / src / os.c

diff --git a/src/src/os.c b/src/src/os.c
index 4fa9324d4902b9d6b3c2d52b24aae0792a118fd3..1cde1b8ecde19ff2aa030819a52d58398cc9d0b7 100644 (file)
--- a/src/src/os.c
+++ b/src/src/os.c
@@ -1,10 +1,8 @@
-/* $Cambridge: exim/src/src/os.c,v 1.8 2009/11/16 19:50:37 nm4 Exp $ */
-
 /*************************************************
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 #ifdef STAND_ALONE
@@ -797,6 +795,98 @@ return yield;
 
 
 
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+*                 DNS Resolver Base Finder                 *
+***********************************************************/
+
+/* We need to be able to set options for the system resolver(5), historically
+made available as _res.  At least one OS (NetBSD) now no longer provides this
+directly, instead making you call a function per thread to get a handle.
+Other OSs handle thread-safe resolver differently, in ways which fail if the
+programmer creates their own structs. */
+
+#if !defined(OS_GET_DNS_RESOLVER_RES) && !defined(COMPILE_UTILITY)
+
+#include <resolv.h>
+
+/* confirmed that res_state is typedef'd as a struct* on BSD and Linux, will
+find out how unportable it is on other OSes, but most resolver implementations
+should be descended from ISC's bind.
+
+Linux and BSD do:
+  define _res (*__res_state())
+identically.  We just can't rely on __foo functions.  It's surprising that use
+of _res has been as portable as it has, for so long.
+
+So, since _res works everywhere, and everything can decode the struct, I'm
+going to gamble that res_state is a typedef everywhere and use that as the
+return type.
+*/
+
+res_state
+os_get_dns_resolver_res(void)
+{
+  return &_res;
+}
+
+#endif /* OS_GET_DNS_RESOLVER_RES */
+
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+*                 unsetenv()                               *
+***********************************************************/
+
+/* Most modern systems define int unsetenv(const char*),
+* some don't. */
+
+#if !defined(OS_UNSETENV)
+int
+os_unsetenv(const uschar * name)
+{
+return unsetenv(CS name);
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+*               getcwd()                                   *
+***********************************************************/
+
+/* Glibc allows getcwd(NULL, 0) to do auto-allocation. Some systems
+do auto-allocation, but need the size of the buffer, and others
+may not even do this. If the OS supports getcwd(NULL, 0) we'll use
+this, for all other systems we provide our own getcwd() */
+
+#if !defined(OS_GETCWD)
+uschar *
+os_getcwd(uschar * buffer, size_t size)
+{
+return getcwd(CS buffer, size);
+}
+#else
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+uschar *
+os_getcwd(uschar * buffer, size_t size)
+{
+void *rc;
+
+if (!size) size = PATH_MAX;
+if (!buffer && !(buffer = US malloc(size))) return NULL;
+if (!(buffer = getcwd(CS buffer, size))) return NULL;
+return realloc(CS buffer, strlen(buffer) + 1);
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+
+
 
 /*************************************************
 **************************************************