libposix: implement gettimeofday

qa/lib/newlib/040-gettimeofday.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <sys/time.h>
+
+int main (int argc, char** argv) {
+	struct timeval tvalBefore, tvalAfter;
+	long delta;
+
+	gettimeofday (&tvalBefore, NULL);
+	int i =0;
+	while (i < 10000)
+		i++;
+
+	gettimeofday (&tvalAfter, NULL);
+
+	// Changed format to long int (%ld), changed time calculation
+
+	delta = ((tvalAfter.tv_sec - tvalBefore.tv_sec)*1000000L
+		   +tvalAfter.tv_usec) - tvalBefore.tv_usec;
+	printf("Time in microseconds: %ld microseconds\n", delta);
+
+	if(delta > 0)
+		return 0;
+	return 1;
+}

qa/lib/newlib/build.json

@@ -35,6 +35,7 @@
 			"010-fork.c",
 			"020-waitpid.c",
 			"030-pause.c",
+			"040-gettimeofday.c",
 			"100-files.c",
 			"101-files.c",
 			"102-files.c",
@@ -84,6 +85,7 @@
 			"010-fork.c",
 			"020-waitpid.c",
 			"030-pause.c",
+			"040-gettimeofday.c",
 			"100-files.c",
 			"101-files.c",
 			"102-files.c",

sys/src/lib/posix/build.json

@@ -18,7 +18,8 @@
 			"others.c",
 			"processes.c",
 			"sigchlds.c",
-			"signals.c"
+			"signals.c",
+			"timers.c"
 		]
 	}
 }

sys/src/lib/posix/others.c

@@ -75,13 +75,6 @@ POSIX_times(int *errnop, void *buf)
 	return -1;
 }
 
-int
-POSIX_gettimeofday(int *errnop, void *timeval, void *timezone)
-{
-	*errnop = __libposix_get_errno(PosixEINVAL);
-	return -1;
-}
-
 char*
 POSIX_getlogin(int *errnop)
 {

sys/src/lib/posix/processes.c

@@ -46,7 +46,7 @@ __libposix_free_wait_list(void)
 {
 	WaitList *wl, *c;
 
-	/* free the wait list as the memory is shared */
+	/* free the wait list as the memory is NOT shared */
 	wl = *__libposix_wait_list;
 	if(wl != nil){
 		*__libposix_wait_list = nil;

sys/src/lib/posix/signals.c

@@ -38,7 +38,8 @@
  *
  * Since notes in Jehanne are not reentrant, signals translated to
  * notes will be enqueued in kernel. A special machinery is implemented
- * for timers, so that they can be used in signal handlers.
+ * for timers, so that they can be used in signal handlers to wakeup
+ * the calling process.
  *
  * For all the signals except SIGCONT, the burden of interpreting the
  * signal is on the receiver: the sender just send the signal.
@@ -98,7 +99,7 @@
  *
  * TIMERS
  * ------
- * The functions alarm() and settimer() generate SIGALRM, SIGPROF
+ * The functions alarm() and setitimer() generate SIGALRM, SIGPROF
  * or SIGVTALRM for the current process. We want timers to be able to
  * expire in a signal handler (interrupting a blocking syscall) but
  * without giving up the simplicity of notes.

sys/src/lib/posix/timers.c

@@ -0,0 +1,76 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * Jehanne 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 Affero General Public License
+ * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <lib9.h>
+#include <posix.h>
+#include "internal.h"
+
+static PosixTimevalReader __libposix_timeval_reader;
+static PosixTimezoneReader __libposix_timezone_reader;
+
+int
+POSIX_gettimeofday(int *errnop, void *timeval, void *timezone)
+{
+	Tm *t;
+	PosixError e = 0;
+
+	if(timeval == nil && timezone == nil){
+		e = PosixEFAULT;
+		goto FailWithError;
+	}
+
+	t = localtime(time(nil));
+
+	if(timeval != nil){
+		e = __libposix_timeval_reader(timeval, t);
+		if(e != 0)
+			goto FailWithError;
+	}
+	if(timezone != nil){
+		e = __libposix_timezone_reader(timezone, t);
+		if(e != 0)
+			goto FailWithError;
+	}
+	return 0;
+
+FailWithError:
+	*errnop = __libposix_get_errno(e);
+	return -1;
+}
+
+int
+libposix_set_timeval_reader(PosixTimevalReader reader)
+{
+	if(__libposix_initialized())
+		return 0;
+	if(reader == nil)
+		return 0;
+	__libposix_timeval_reader = reader;
+	return 1;
+}
+
+int
+libposix_set_timezone_reader(PosixTimezoneReader reader)
+{
+	if(__libposix_initialized())
+		return 0;
+	if(reader == nil)
+		return 0;
+	__libposix_timezone_reader = reader;
+	return 1;
+}