Genesis commit

11 files changed, 229 insertions, 0 deletions

diff --git a/c/.gitignore b/c/.gitignore
new file mode 100644
index 0000000..b8be893
--- /dev/null
+++ b/c/.gitignore
@@ -0,0 +1,3 @@
+.cache/
+compile_commands.json
+*.o
diff --git a/c/base.mk b/c/base.mk
new file mode 100644
index 0000000..7aea715
--- /dev/null
+++ b/c/base.mk
@@ -0,0 +1,4 @@
+CC = cc
+CFLAGS = \
+	-Wall -Wextra -Werror -Wpedantic -pipe \
+	-O3 -flto -march=native -mtune=native
diff --git a/c/cat/.gitignore b/c/cat/.gitignore
new file mode 100644
index 0000000..ef07ddc
--- /dev/null
+++ b/c/cat/.gitignore
@@ -0,0 +1 @@
+cat
diff --git a/c/cat/Makefile b/c/cat/Makefile
new file mode 100644
index 0000000..081ffd4
--- /dev/null
+++ b/c/cat/Makefile
@@ -0,0 +1,8 @@
+include ../base.mk
+
+all: cat
+cat: cat.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+clean:
+	rm -f cat
diff --git a/c/cat/cat.c b/c/cat/cat.c
new file mode 100644
index 0000000..7aaaa6b
--- /dev/null
+++ b/c/cat/cat.c
@@ -0,0 +1,102 @@
+#include <sys/sendfile.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define warn(...) \
+	do { \
+		warn(__VA_ARGS__); \
+		rv = EXIT_FAILURE; \
+	} while (0)
+
+static int rv = EXIT_SUCCESS;
+static bool out_is_reg;
+static char buf[BUFSIZ];
+
+static void cat(const char *);
+static void cat_sendfile(const char *, int, size_t);
+static void cat_readwrite(const char *, int);
+
+int
+main(int argc, char **argv)
+{
+	struct stat sb;
+
+	if (fstat(STDOUT_FILENO, &sb) == -1)
+		warn("fstat: /dev/stdout");
+	else
+		out_is_reg = S_ISREG(sb.st_mode);
+
+	if (argc == 1)
+		cat("-");
+	for (int i = 1; i < argc; i++)
+		cat(argv[i]);
+	return rv;
+}
+
+void
+cat(const char *file)
+{
+	int fd;
+	struct stat sb;
+
+	if (strcmp(file, "-") == 0)
+		fd = STDIN_FILENO;
+	else if ((fd = open(file, O_RDONLY)) == -1) {
+		warn("open: %s", file);
+		return;
+	}
+
+	if (fstat(fd, &sb) == -1) {
+		warn("fstat: %s", file);
+		goto out;
+	}
+
+	if (S_ISREG(sb.st_mode) && out_is_reg)
+		cat_sendfile(file, fd, sb.st_size);
+	else
+		cat_readwrite(file, fd);
+
+out:
+	close(fd);
+}
+
+void
+cat_sendfile(const char *file, int fd, size_t n)
+{
+	off_t off = 0;
+	ssize_t nw;
+
+	do {
+		nw = sendfile(STDOUT_FILENO, fd, &off, n);
+		off += nw;
+	} while (nw != -1 && (size_t)off < n);
+
+	if (nw == -1)
+		warn("sendfile: %s", file);
+}
+
+void
+cat_readwrite(const char *file, int fd)
+{
+	ssize_t nr, nw;
+
+	while ((nr = read(fd, buf, BUFSIZ)) > 0) {
+		for (ssize_t off = 0; nr > 0; nr -= nw, off += nw) {
+			if ((nw = write(STDOUT_FILENO, buf + off, nr)) == -1) {
+				warn("write: %s", file);
+				return;
+			}
+		}
+	}
+	if (nr == -1)
+		warn("read: %s", file);
+}
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;
+}
diff --git a/c/timer/.gitignore b/c/timer/.gitignore
new file mode 100644
index 0000000..fe84f2c
--- /dev/null
+++ b/c/timer/.gitignore
@@ -0,0 +1 @@
+timer
diff --git a/c/timer/Makefile b/c/timer/Makefile
new file mode 100644
index 0000000..410dc79
--- /dev/null
+++ b/c/timer/Makefile
@@ -0,0 +1,11 @@
+include ../base.mk
+
+CFLAGS := $(CFLAGS) $(shell pkg-config --cflags libnotify) -D_ISOC99_SOURCE
+LDLIBS = $(shell pkg-config --libs libnotify)
+
+all: timer
+timer: main.c
+	$(CC) $(CFLAGS) $(LDLIBS) -o $@ $<
+
+clean:
+	rm -f timer
diff --git a/c/timer/main.c b/c/timer/main.c
new file mode 100644
index 0000000..751cbca
--- /dev/null
+++ b/c/timer/main.c
@@ -0,0 +1,48 @@
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libnotify/notify.h>
+
+#define die(...)  err(EXIT_FAILURE, __VA_ARGS__)
+#define diex(...) errx(EXIT_FAILURE, __VA_ARGS__)
+
+static char buf[128];
+
+int
+main(int argc, char **argv)
+{
+	char *endptr;
+	long secs;
+
+	if (argc != 3) {
+		fprintf(stderr, "Usage: %s secs body\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	errno = 0;
+	secs = strtol(argv[1], &endptr, 10);
+	if (errno)
+		die("strtol: %s", argv[1]);
+	if (endptr == argv[1] || *endptr)
+		diex("Invalid integer: %s", argv[1]);
+
+	snprintf(buf, sizeof(buf), "%ld Second%s Elapsed", secs,
+	         secs == 1 ? "" : "s");
+
+	notify_init("TIMER");
+	NotifyNotification *n =
+		notify_notification_new(buf, argv[2], "dialog-information");
+
+	notify_notification_set_timeout(n, 5000);
+	while ((secs = sleep(secs)))
+		sleep(secs);
+	if (!notify_notification_show(n, NULL))
+		diex("Failed to send notification");
+
+	g_object_unref(G_OBJECT(n));
+	notify_uninit();
+	return EXIT_SUCCESS;
+}