From 03f8544691a8de9f77a803fd8cd2eeadb919ec03 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sun, 10 Dec 2023 00:39:16 +0100
Subject: Genesis commit

---
 c/sigfd/.gitignore |  1 +
 c/sigfd/Makefile   |  8 ++++++++
 c/sigfd/main.c     | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+)
 create mode 100644 c/sigfd/.gitignore
 create mode 100644 c/sigfd/Makefile
 create mode 100644 c/sigfd/main.c

(limited to 'c/sigfd')

diff --git a/c/sigfd/.gitignore b/c/sigfd/.gitignore
new file mode 100644
index 0000000..067fa65
--- /dev/null
+++ b/c/sigfd/.gitignore
@@ -0,0 +1 @@
+sigfd
diff --git a/c/sigfd/Makefile b/c/sigfd/Makefile
new file mode 100644
index 0000000..f126000
--- /dev/null
+++ b/c/sigfd/Makefile
@@ -0,0 +1,8 @@
+include ../base.mk
+
+all: sigfd
+sigfd: main.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+clean:
+	rm -f sigfd
diff --git a/c/sigfd/main.c b/c/sigfd/main.c
new file mode 100644
index 0000000..6721f60
--- /dev/null
+++ b/c/sigfd/main.c
@@ -0,0 +1,42 @@
+#include <sys/poll.h>
+#include <sys/signalfd.h>
+
+#include <err.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define die(...)    err(EXIT_FAILURE, __VA_ARGS__)
+#define lengthof(a) (sizeof(a) / sizeof(*(a)))
+
+static char buf[4096];
+
+int
+main(void)
+{
+	sigset_t set;
+	sigemptyset(&set);
+	sigaddset(&set, SIGINT);
+	sigaddset(&set, SIGQUIT);
+	sigprocmask(SIG_BLOCK, &set, NULL);
+
+	int fd = signalfd(-1, &set, 0);
+	if (fd == -1)
+		die("signalfd");
+
+	struct pollfd fds[] = {
+		{.fd = fd, .events = POLL_IN},
+	};
+	for (;;) {
+		if (poll(fds, lengthof(fds), -1) == -1)
+			die("poll");
+		if (fds[0].revents & POLL_IN) {
+			fputs("Caught signal!\n", stderr);
+			read(fds[0].fd, buf, sizeof(buf));
+		}
+	}
+
+	return EXIT_SUCCESS;
+}
-- 
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