Initial commit

.gitmodules

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+[submodule "libcatch"]
+	path = libcatch
+	url = https://gitlab.com/niansa/libcatch.git

inotifyrun.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/inotify.h>
+#include <linux/fs.h>
+#include "libcatch/libcatch.h"
+
+struct fcmd_pair {
+	const char *fname;
+	const char *command;
+};
+struct fcmdwatcher_pair {
+	struct fcmd_pair *pair;
+	int watcher;
+};
+
+
+int main(int argc, char **argv) {
+	int inotifier;
+	libcatch_init();
+	//int *p = NULL; *p = 1; //DEBUG
+	//*p = 1; //DEBUG
+	// Check arguments
+	if (argc == 1 || (argc - 1) % 2 != 0) {
+		// No arguments passed
+		printf("Usage: %s {<file> <command>}\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+	// Initialise inotify
+	CATCH(
+		inotifier = inotify_init()
+	);
+	// Get array of files and commands
+	libcatch_retry = 0;
+	struct fcmd_pair *assocs = (struct fcmd_pair *)(argv + 1);
+	struct fcmdwatcher_pair *assocs_watches = malloc((sizeof(struct fcmdwatcher_pair) * ((argc - 1) / 2)) + 1);
+	struct fcmdwatcher_pair *watcherpair_ptr;
+	CATCH(assocs_watches = malloc((sizeof(struct fcmdwatcher_pair) * ((argc - 1) / 2)) + 1));
+	// Initlialise inotify further while checking if all files are actual files
+	libcatch_retry = 2;
+	for (struct fcmd_pair *thispair = assocs; *(char**)thispair; thispair++) {
+		// Check if file is an actual file
+		struct stat fname_stat;
+		stat(thispair->fname, &fname_stat);
+		if (S_ISDIR(fname_stat.st_mode)) {
+			fprintf(stderr, "'%s' is a directory and will be ignored.\n", thispair->fname);
+			continue;
+		}
+		// Initialise inotify further
+		watcherpair_ptr = &assocs_watches[thispair - assocs];
+		watcherpair_ptr->pair = thispair;
+		CATCH(
+			watcherpair_ptr->watcher = inotify_add_watch(inotifier, thispair->fname, IN_OPEN)
+		);
+	}
+	// Wait for events to occur
+	libcatch_retry = 1;
+	struct inotify_event thisevent;
+	while (1) {
+		// Read new event
+		CATCH(
+			read(inotifier, &thisevent, sizeof(thisevent) + NAME_MAX + 1)
+		);
+		// Find associated event pair
+		for (
+		     watcherpair_ptr = assocs_watches;
+		     watcherpair_ptr->watcher != thisevent.wd;
+		     watcherpair_ptr++
+		);
+		// Run assiciated command
+		system(watcherpair_ptr->pair->command);
+	}
+}

libcatch

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+Subproject commit 4a7f680d19963b35c0688aa3dcf2ec4f06940ff9

test.sh

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+#! /bin/true