[git commit] ps: use separate get_uptime() and make it work on non-linux too

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=ac42e3de90ebf4b921035893e3670da63cad882c
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Create get_uptime() function in procps/ps.c, and use it rather than
relying on linux-specific sysinfo() inline.

Signed-off-by: Michael Tokarev <mjt at tls.msk.ru>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 procps/ps.c |   40 +++++++++++++++++++++++++++++-----------
 1 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/procps/ps.c b/procps/ps.c
index 4727b21..3a5af7c 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -69,6 +69,31 @@
 /* Absolute maximum on output line length */
 enum { MAX_WIDTH = 2*1024 };
 
+#if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
+static long get_uptime(void)
+{
+#ifdef __linux__
+	struct sysinfo info;
+	if (sysinfo(&info) < 0)
+		return 0;
+	return info.uptime;
+#elif 1
+	char buf[64];
+	long uptime;
+	if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
+		bb_perror_msg_and_die("can't read %s", "/proc/uptime");
+	buf[sizeof(buf)-1] = '\0';
+	sscanf(buf, "%l", &uptime);
+	return uptime;
+#else
+	struct timespec ts;
+	if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
+		return 0;
+	return ts.tv_sec;
+#endif
+}
+#endif
+
 #if ENABLE_DESKTOP
 
 #include <sys/times.h> /* for times() */
@@ -197,8 +222,6 @@ static inline unsigned get_HZ_by_waiting(void)
 
 static unsigned get_kernel_HZ(void)
 {
-	//char buf[64];
-	struct sysinfo info;
 
 	if (kernel_HZ)
 		return kernel_HZ;
@@ -208,12 +231,7 @@ static unsigned get_kernel_HZ(void)
 	if (kernel_HZ == (unsigned)-1)
 		kernel_HZ = get_HZ_by_waiting();
 
-	//if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
-	//	bb_perror_msg_and_die("can't read %s", "/proc/uptime");
-	//buf[sizeof(buf)-1] = '\0';
-	///sscanf(buf, "%llu", &seconds_since_boot);
-	sysinfo(&info);
-	seconds_since_boot = info.uptime;
+	seconds_since_boot = get_uptime();
 
 	return kernel_HZ;
 }
@@ -635,7 +653,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 	};
 #if ENABLE_FEATURE_PS_LONG
 	time_t now = now;
-	struct sysinfo info;
+	long uptime;
 #endif
 	int opts = 0;
 	/* If we support any options, parse argv */
@@ -695,7 +713,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 		puts("S   UID   PID  PPID   VSZ   RSS TTY   STIME TIME     CMD");
 #if ENABLE_FEATURE_PS_LONG
 		now = time(NULL);
-		sysinfo(&info);
+		uptime = get_uptime();
 #endif
 	}
 	else {
@@ -727,7 +745,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 				char tty[2 * sizeof(int)*3 + 2];
 				char *endp;
 				unsigned sut = (p->stime + p->utime) / 100;
-				unsigned elapsed = info.uptime - (p->start_time / 100);
+				unsigned elapsed = uptime - (p->start_time / 100);
 				time_t start = now - elapsed;
 				struct tm *tm = localtime(&start);