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	add 'up' for whether a interface is up or down - slstatus - status monitor
	git clone git://git.suckless.org/slstatus
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	---
	commit af508f0b4cf88b1921c59fdf5dd1a98c08223fa5
	parent b6267f7d0bedf5789206adf21f33cfe1a872289c
	Author: sewn <[email protected]>
	Date: Sat, 16 Mar 2024 00:20:54 +0300

	add 'up' for whether a interface is up or down

	Diffstat:
	M components/ip.c \| 26 ++++++++++++++++++++++++++
	M config.def.h \| 1 +
	M slstatus.h \| 1 +

	3 files changed, 28 insertions(+), 0 deletions(-)
	---
	diff --git a/components/ip.c b/components/ip.c
	@@ -1,6 +1,7 @@
	/* See LICENSE file for copyright and license details. */
	#include <ifaddrs.h>
	#include <netdb.h>
	+#include <net/if.h>
	#include <stdio.h>
	#include <string.h>
	#if defined(__OpenBSD__)
	@@ -59,3 +60,28 @@ ipv6(const char *interface)
	{
	return ip(interface, AF_INET6);
	}
	+
	+const char *
	+up(const char *interface)
	+{
	+ struct ifaddrs ifaddr, ifa;
	+
	+ if (getifaddrs(&ifaddr) < 0) {
	+ warn("getifaddrs:");
	+ return NULL;
	+ }
	+
	+ for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
	+ if (!ifa->ifa_addr)
	+ continue;
	+
	+ if (!strcmp(ifa->ifa_name, interface)) {
	+ freeifaddrs(ifaddr);
	+ return ifa->ifa_flags & IFF_UP ? "up" : "down";
	+ }
	+ }
	+
	+ freeifaddrs(ifaddr);
	+
	+ return NULL;
	+}
	diff --git a/config.def.h b/config.def.h
	@@ -56,6 +56,7 @@ static const char unknown_str[] = "n/a";
	* thermal zone on FreeBSD
	* (tz0, tz1, etc.)
	* uid UID of current user NULL
	+ * up interface is running interface name (eth0)
	* uptime system uptime NULL
	* username username of current user NULL
	* vol_perc OSS/ALSA volume in percent mixer file (/dev/mixer)
	diff --git a/slstatus.h b/slstatus.h
	@@ -30,6 +30,7 @@ const char hostname(const char unused);
	/* ip */
	const char ipv4(const char interface);
	const char ipv6(const char interface);
	+const char up(const char interface);

	/* kernel_release */
	const char kernel_release(const char unused);