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	tAdd Linux support for the wifi plugin - spoon - dwm status utility (2f30 fork)
	git clone git://src.adamsgaard.dk/spoon
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	---
	commit 39a4ec480bc9db2e4fca1506856309dc884d1fb9
	parent 36856fa7ba39356dcf456226797ff588a5733999
	Author: lostd <[email protected]>
	Date: Wed, 2 Nov 2016 14:37:07 +0100

	Add Linux support for the wifi plugin

	Diffstat:
	M util.h \| 10 ++++++++++
	M wifi.c \| 93 +++++++++++++++++++++++++++++…

	2 files changed, 99 insertions(+), 4 deletions(-)
	---
	diff --git a/util.h b/util.h
	t@@ -2,3 +2,13 @@
	size_t strlcat(char , const char , size_t);
	#undef strlcpy
	size_t strlcpy(char , const char , size_t);
	+
	+#ifdef DEBUG
	+#define DPRINTF_S(x) printf(#x "=%s\n", x)
	+#define DPRINTF_U(x) printf(#x "=%u\n", x)
	+#define DPRINTF_D(x) printf(#x "=%d\n", x)
	+#else
	+#define DPRINTF_S(x)
	+#define DPRINTF_U(x)
	+#define DPRINTF_D(x)
	+#endif
	diff --git a/wifi.c b/wifi.c
	t@@ -1,5 +1,8 @@
	#include <err.h>
	+#include <ifaddrs.h>
	#include <stdio.h>
	+#include <string.h>
	+#include <unistd.h>

	#include "util.h"

	t@@ -32,10 +35,6 @@ wifiprint(char *buf, size_t len, int quality)
	#include <net80211/ieee80211.h>
	#include <net80211/ieee80211_ioctl.h>

	-#include <ifaddrs.h>
	-#include <string.h>
	-#include <unistd.h>
	-
	int
	wifiread(void arg, char buf, size_t len)
	{
	t@@ -105,4 +104,90 @@ wifiread(void arg, char buf, size_t len)
	return 0;
	return -1;
	}
	+#elif __linux__
	+#include <sys/types.h>
	+#include <sys/socket.h>
	+
	+#include <linux/wireless.h>
	+
	+int
	+wifiread(void arg, char buf, size_t len)
	+{
	+ struct ifaddrs ifa, ifas;
	+ struct iw_quality max_qual, qual;
	+ struct iw_statistics stats;
	+ struct iw_range range;
	+ struct iwreq wrq;
	+ int quality = -1;
	+ int level;
	+ int ret, fd;
	+
	+ if (getifaddrs(&ifas) < 0) {
	+ warn("getifaddrs");
	+ return -1;
	+ }
	+ fd = socket(PF_INET, SOCK_DGRAM, 0);
	+ if (fd == -1) {
	+ warn("socket");
	+ return -1;
	+ }
	+ for (ifa = ifas; ifa != NULL; ifa = ifa->ifa_next) {
	+ DPRINTF_S(ifa->ifa_name);
	+ memset(&wrq, 0, sizeof(wrq));
	+ strlcpy(wrq.ifr_name, ifa->ifa_name, IFNAMSIZ);
	+ ret = ioctl(fd, SIOCGIWNAME, &wrq);
	+ if (ret != 0)
	+ continue;
	+ memset(&wrq, 0, sizeof(wrq));
	+ strlcpy(wrq.ifr_name, ifa->ifa_name, IFNAMSIZ);
	+ wrq.u.data.pointer = &range;
	+ wrq.u.data.length = sizeof(range);
	+ memset(&range, 0, sizeof(range));
	+ ret = ioctl(fd, SIOCGIWRANGE, &wrq);
	+ if (ret < 0)
	+ warnx("cannot get wifi range");
	+ memset(&wrq, 0, sizeof(wrq));
	+ strlcpy(wrq.ifr_name, ifa->ifa_name, IFNAMSIZ);
	+ wrq.u.data.pointer = &stats;
	+ wrq.u.data.length = sizeof(stats);
	+ wrq.u.data.flags = 1;
	+ memset(&stats, 0, sizeof(stats));
	+ ret = ioctl(fd, SIOCGIWSTATS, &wrq);
	+ if (ret < 0)
	+ warnx("cannot get wifi stats");
	+ max_qual = &range.max_qual;
	+ qual = &stats.qual;
	+ DPRINTF_U(max_qual->qual);
	+ DPRINTF_U(max_qual->level);
	+ DPRINTF_U(qual->qual);
	+ DPRINTF_U(qual->level);
	+ if (max_qual->qual != 0) {
	+ /* driver provides a quality metric */
	+ quality = (unsigned)
	+ (((float)qual->qual / max_qual->qual) * 100);
	+ } else if (max_qual->level != 0) {
	+ /* driver provides signal strength (RSSI) */
	+ quality = (unsigned)
	+ (((float)qual->level / max_qual->level) * 100);
	+ } else if (max_qual->level == 0) {
	+ /* driver provides absolute dBm values */
	+ level = qual->level - 0x100;
	+ if (level <= -100)
	+ quality = 0;
	+ else if (level >= -50)
	+ quality = 100;
	+ else
	+ quality = 2 * (level + 100);
	+ }
	+ break;
	+ }
	+ close(fd);
	+ freeifaddrs(ifas);
	+
	+ DPRINTF_D(quality);
	+ if (quality == -1)
	+ return -1;
	+ wifiprint(buf, len, quality);
	+ return 0;
	+}
	#endif