initiate commitment protocol

.gitignore

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+automount*
+tests/**
+!**/*.c
+!**/*.c
+

LICENSE

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+MIT License
+
+Copyright (c) 2020 Alessandro Mauri
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

automount.c

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+/*
+ * MIT License
+ * 
+ * Copyright (c) 2020 Alessandro Mauri
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <poll.h>
+#include <sys/inotify.h>
+#include <sys/epoll.h>
+
+/* ANSI colors escape codes */
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_GREEN   "\x1b[32m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_BLUE    "\x1b[34m"
+#define ANSI_COLOR_MAGENTA "\x1b[35m"
+#define ANSI_COLOR_CYAN    "\x1b[36m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
+#define DEV_BLOCK_ROOT "/dev/block/"
+
+#define red(str) ANSI_COLOR_RED str ANSI_COLOR_RESET
+#define yellow(str) ANSI_COLOR_YELLOW str ANSI_COLOR_RESET
+
+static void die (const char *, ...);
+static void usage (void);
+static const char * get_path (const char *);
+
+int main (int argc, char *argv[])
+{
+	struct pollfd watchpoll = {0, POLLIN, 0};
+	const struct inotify_event *event;
+	char buf[4096], strbuf[256];
+	char *ptr;
+	int opt, len, fd;
+
+	while ((opt = getopt(argc, argv, "h")) != -1) {
+		switch (opt) {
+		case 'h':
+			usage();
+			exit(EXIT_SUCCESS);
+			break;
+		default:
+			puts(red("Option not recognized\n"));
+			usage();
+			exit(EXIT_FAILURE);
+			break;
+		}
+	}
+
+	if ((fd = inotify_init()) < 0)
+		die("error initializing inotify watch list");
+	watchpoll.fd = fd;
+	if (inotify_add_watch(fd, DEV_BLOCK_ROOT, IN_CREATE | IN_DELETE) < 0)
+		die ("error adding " DEV_BLOCK_ROOT " to the watch list");
+
+	for (;poll(&watchpoll, 1, -1);) {
+		if (watchpoll.revents != POLLIN)
+			continue;
+
+		len = read(watchpoll.fd, buf, sizeof(buf));
+		if (len < 0) {
+			printf(red("read error: %s\n"), strerror(errno));
+			break;
+		} else if (!len) {
+			puts("No data to read\n");
+			break;
+		}
+
+		for (ptr = buf; ptr < buf + len;
+		     ptr += sizeof(struct inotify_event) + event->len) {
+			event = (const struct inotify_event *) ptr;
+			if(!event->len)
+				continue;
+			strcpy(strbuf, DEV_BLOCK_ROOT);
+			strcat(strbuf, event->name);
+		     	printf(yellow("%s: %s\n"), event->mask & IN_CREATE ? "Created" : "Removed", get_path(strbuf));
+		}
+	}
+	die("polling interrupted");
+
+	close(watchpoll.fd);
+	return 0;
+}
+
+static void die(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+
+	fputs(ANSI_COLOR_RED, stderr);
+     	vfprintf(stderr, fmt, ap);
+
+	if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
+		fputc(' ', stderr);
+		perror(NULL);
+	} else {
+		fputc('\n', stderr);
+	}
+     	fputs(ANSI_COLOR_RESET, stderr);
+
+	va_end(ap);
+	exit(errno ? errno : 1);
+}
+
+static void usage (void)
+{
+	puts("Usage:  automount [-h]\n"
+	      "-h      print this message\n");
+}
+
+static const char * get_path (const char *sym)
+{
+	static char buf[256];
+	memset(buf, 0, 256);
+
+	readlink(sym, buf, 256);
+	if (buf[255])
+		return NULL;
+
+	return buf;
+}

makefile

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+CFLAGS = -Wall -Werror -pedantic -O2 -std=c99
+CC = gcc
+
+automount: automount.c
+
+debug: automount.c
+	${CC} ${LDFLAGS} -O0 -g -o automount_debug $?
+
+clean:
+	rm -f automount automount_debug