libreplace: add clock_gettime replacement function for systems that don't have it

lib/replace/README

@@ -33,6 +33,7 @@ opendir
 readdir
 telldir
 seekdir
+clock_gettime
 closedir
 dlopen
 dlclose

lib/replace/replace.c

@@ -760,3 +760,24 @@ int rep_strerror_r(int errnum, char *buf, size_t buflen)
 	return 0;
 }
 #endif
+
+#ifndef HAVE_CLOCK_GETTIME
+int rep_clock_gettime(clockid_t clk_id, struct timespec *tp)
+{
+	struct timeval tval;
+	switch (clk_id) {
+		case 0: /* CLOCK_REALTIME :*/
+#ifdef HAVE_GETTIMEOFDAY_TZ
+			gettimeofday(&tval,NULL);
+#else
+			gettimeofday(&tval);
+#endif
+			tp->tv_sec = tval.tv_sec;
+			tp->tv_nsec = tval.tv_usec * 1000;
+			break;
+		default:
+			return EINVAL;
+	}
+	return 0;
+}
+#endif

lib/replace/replace.h

@@ -517,6 +517,10 @@ char *rep_get_current_dir_name(void);
 int rep_strerror_r(int errnum, char *buf, size_t buflen);
 #endif
 
+#if !defined(HAVE_CLOCK_GETTIME)
+#define clock_gettime rep_clock_gettime
+#endif
+
 #ifdef HAVE_LIMITS_H
 #include <limits.h>
 #endif

lib/replace/system/time.h

@@ -66,4 +66,10 @@ int rep_utime(const char *filename, const struct utimbuf *buf);
 int rep_utimes(const char *filename, const struct timeval tv[2]);
 #endif
 
+#ifndef HAVE_CLOCK_GETTIME
+#define CLOCK_REALTIME 0
+typedef int clockid_t;
+int rep_clock_gettime(clockid_t clk_id, struct timespec *tp);
+#endif
+
 #endif