From 7e94554b6208295bfbfce701dbb2131f17daa0a5 Mon Sep 17 00:00:00 2001
From: David van Moolenbroek <david@minix3.org>
Date: Thu, 28 Aug 2014 11:40:55 +0000
Subject: [PATCH] uptime(1): also report uptime

It might be more useful this way.  *cough*

Change-Id: I318169fef8bf7737dc46eebf5c5332ce42a9076a
---
 minix/usr.bin/w/minix_proc.c | 24 ++++++++++++++++++++++--
 minix/usr.bin/w/minix_proc.h |  2 ++
 usr.bin/w/w.c                |  8 ++++++++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/minix/usr.bin/w/minix_proc.c b/minix/usr.bin/w/minix_proc.c
index a5d112fdd..665196c9e 100644
--- a/minix/usr.bin/w/minix_proc.c
+++ b/minix/usr.bin/w/minix_proc.c
@@ -129,7 +129,7 @@ minix_getproc(void * __unused dummy, int op, int arg, int elemsize, int *cnt)
 	for (i = 0; i < npids; i++) {
 		pid = pids[i];
 
-		snprintf(path, sizeof(path), _PATH_PROC "/%u/psinfo", pid);
+		snprintf(path, sizeof(path), _PATH_PROC "%u/psinfo", pid);
 
 		/* Processes may legitimately disappear between calls. */
 		if ((fp = fopen(path, "r")) == NULL)
@@ -165,7 +165,7 @@ minix_getargv(void * __unused dummy, const struct minix_proc * p, int nchr)
 	int fd, argc;
 
 	/* Get the command line of the process from procfs. */
-	snprintf(path, sizeof(path), _PATH_PROC "/%u/cmdline", p->p_pid);
+	snprintf(path, sizeof(path), _PATH_PROC "%u/cmdline", p->p_pid);
 
 	if ((fd = open(path, O_RDONLY)) < 0)
 		return NULL;
@@ -251,3 +251,23 @@ minix_proc_compare(const struct minix_proc * p1, const struct minix_proc * p2)
 	 */
 	return p1->p_pid < p2->p_pid;
 }
+
+/*
+ * Obtain the system uptime in seconds.  Return 0 on success, with the uptime
+ * stored in the given time_t field.  Return -1 on failure.
+ */
+int
+minix_getuptime(time_t *timep)
+{
+	FILE *fp;
+	int r;
+
+	if ((fp = fopen(_PATH_PROC "uptime", "r")) == NULL)
+		return -1;
+
+	r = fscanf(fp, "%llu", timep);
+
+	fclose(fp);
+
+	return (r == 1) ? 0 : -1;
+}
diff --git a/minix/usr.bin/w/minix_proc.h b/minix/usr.bin/w/minix_proc.h
index a216dbb45..a38bedbe9 100644
--- a/minix/usr.bin/w/minix_proc.h
+++ b/minix/usr.bin/w/minix_proc.h
@@ -44,4 +44,6 @@ int minix_proc_compare(const struct minix_proc *p1,
 #undef proc_compare_wrapper
 #define proc_compare_wrapper minix_proc_compare
 
+int minix_getuptime(time_t *timep);
+
 #endif /* !_W_MINIX_PROC_H */
diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
index 1516ef357..4a80312e3 100644
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -475,8 +475,12 @@ pr_header(time_t *nowp, int nusers)
 	double avenrun[3];
 	time_t uptime;
 	int days, hrs, mins;
+#ifndef __minix
 	int mib[2];
 	size_t size, i;
+#else
+	size_t i;
+#endif /* __minix */
 	char buf[256];
 
 	/*
@@ -493,12 +497,16 @@ pr_header(time_t *nowp, int nusers)
 	 * Print how long system has been up.
 	 * (Found by looking getting "boottime" from the kernel)
 	 */
+#ifndef __minix
 	mib[0] = CTL_KERN;
 	mib[1] = KERN_BOOTTIME;
 	size = sizeof(boottime);
 	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
 	    boottime.tv_sec != 0) {
 		uptime = now - boottime.tv_sec;
+#else
+	if (minix_getuptime(&uptime) != -1) {
+#endif /* __minix */
 		uptime += 30;
 		if (uptime > SECSPERMIN) {
 			days = uptime / SECSPERDAY;