X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/5bfb4cdf352ad40304c6bbf0d826569dea761699..93a680e4c9c899d86ff3fde0933fb5367b34af50:/src/src/os.c

diff --git a/src/src/os.c b/src/src/os.c
index a70bc6115..1cde1b8ec 100644
--- a/src/src/os.c
+++ b/src/src/os.c
@@ -2,7 +2,7 @@
 *     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
@@ -807,7 +807,7 @@ 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. */
 
-#ifndef OS_GET_DNS_RESOLVER_RES
+#if !defined(OS_GET_DNS_RESOLVER_RES) && !defined(COMPILE_UTILITY)
 
 #include <resolv.h>
 
@@ -833,9 +833,57 @@ os_get_dns_resolver_res(void)
 
 #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
+
+/* ----------------------------------------------------------------------- */