Libc-262.tar.gz

[apple/libc.git] / sys / gettimeofday.c

diff --git a/sys/gettimeofday.c b/sys/gettimeofday.c
new file mode 100644 (file)
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+++ b/sys/gettimeofday.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
+ *
+ *     File:   libc/sys/gettimeofday.c
+ */
+
+#include <time.h>
+#include <tzfile.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int gettimeofday (struct timeval *tp, struct timezone *tzp)
+{
+        static int validtz = 0;
+        static struct timezone cached_tz = {0};
+        struct timeval localtv;
+#ifdef __ppc__
+       extern __ppc_gettimeofday(struct timeval *, struct timezone *);
+#endif
+  
+        if (tzp && (tp == NULL) && (validtz == 0)) {
+                tp = &localtv;
+        }
+
+#ifdef __ppc__
+       if(__ppc_gettimeofday(tp, tzp))
+               return(-1);
+#else
+        if (syscall (SYS_gettimeofday, tp, tzp) < 0) {
+                return (-1);
+        }
+#endif
+        if (tzp) {
+               if (validtz == 0)  {
+                       struct tm *localtm = localtime ((time_t *)&tp->tv_sec);
+                       cached_tz.tz_dsttime = localtm->tm_isdst;
+                       cached_tz.tz_minuteswest =
+                               (-localtm->tm_gmtoff / SECSPERMIN) +
+                               (localtm->tm_isdst * MINSPERHOUR);
+                       validtz = 1;
+               }
+               tzp->tz_dsttime = cached_tz.tz_dsttime;
+               tzp->tz_minuteswest = cached_tz.tz_minuteswest;
+        }
+        return (0);
+}