wendy

inotify based node watcher
git clone git://git.2f30.org/wendy.git
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commit 06dd73f39357458f84854d4f22fac139a3210b32
Author: Willy Goiffon <w.goiffon@gmail.com>
Date:   Fri Aug  2 15:30:09 +0200

first commit

Diffstat:
Makefile | 36++++++++++++++++++++++++++++++++++++
wendy.c | 139+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 175 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile @@ -0,0 +1,36 @@ +# BEGINNING OF THE FILE + +# Compilation settings +PROG=wendy +CC=gcc +CFLAGS=-Wall -I inc --std=c99 -pedantic +LDFLAGS= + +# Command paths +RM=/bin/rm + +.PHONY : all list mrproper clean init + +$(PROG) : $(PROG).o + @echo -e "LD $(PROG)" + @$(CC) $^ -o$@ $(LDFLAGS) + +$(PROG).o : $(PROG).c + @echo -e "CC $<" + @$(CC) -c $(CFLAGS) $< -o $@ + +all : clean $(PROG) + +mrproper : clean + $(RM) $(PROG) + +clean : + $(RM) -f *.o + $(RM) -f *~ + +init : + @echo "CC = $(CC)" + @echo "CFLAGS = $(CFLAGS)" + @echo "LDFLAGS = $(LDFLAGS)" + @echo +## EOF diff --git a/wendy.c b/wendy.c @@ -0,0 +1,139 @@ +/* + * Copyright (c) 2013 Willy 'z3bra' Goiffon <willy at mailoo dot org> + * + * 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. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <sys/inotify.h> + +/* definitions, defaults, bla bla blah */ +#define EVENT_SIZE (sizeof(struct inotify_event)) +/* maximum number of event * queuing at the same time */ +#define BUF_LEN (512 * (EVENT_SIZE+16)) + +#define DEFAULT_directory "/var/spool/mail/directory/new" +#define DEFAULT_CHECK 300 /* defaults to 5 minutes */ + +extern char **environ; + +void +usage() +{ + fputs("usage: wendy [-C] [-D] [-M] [-d directory] [-t timeout] " + "-e command [arguments]\n" + "\t-C : raise creation events\n" + "\t-D : raise deletion events\n" + "\t-M : raise modification events\n" + "\t-d directory : directory to watch\n" + "\t-t timeout : time between event check (in seconds)\n" + "\t-e command : command to launch (must be the last argument!)\n", + stdout); + exit(1); +} + +int +execvpe(const char *program, char **argv, char **envp) +{ + char **saved = environ; + int rc; + environ = envp; + rc = execvp(program, argv); + environ = saved; + return rc; +} + +int +main (int argc, char **argv) +{ + int fd, wd, len, mask = 0, i = 0, timeout = 0, ignore = 0; + char buf[BUF_LEN]; + char *directory = NULL, **cmd = NULL; + struct inotify_event *ev; + + if ((argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')) usage(); + + /* parse option given. see usage() above */ + for(i = 1; (i + 1 < argc) && (argv[i][0] == '-') && !ignore; i++) { + switch (argv[i][1]) { + case 'C': mask |= IN_CREATE; break; + case 'D': mask |= IN_DELETE; break; + case 'M': mask |= IN_MODIFY; break; + case 'd': directory = argv[++i]; break; + case 't': timeout = atoi(argv[++i]); break; + case 'e': cmd = &argv[++i]; ignore=1; break; + } + } + + /* test given arguments */ + if (!directory) { directory = DEFAULT_directory; } + if (!timeout) { timeout = DEFAULT_CHECK; } + if (!cmd) { usage(); } + if (!mask) { mask |= IN_CREATE; } + + /* get file descriptor */ + fd = inotify_init(); + if (fd < 0) + perror("inotify_init"); + + /* add a watcher on the directory */ + wd = inotify_add_watch(fd, directory, mask); + + if (wd < 0) + perror("inotify_add_watch"); + + /* start looping */ + while (1) { + /* get every event raised, and queue them */ + len = read(fd, buf, BUF_LEN); + + if (!len || len < 0) { + perror("read"); + } + + i = 0; + + + /* treat all events queued */ + while (i < len) { + + /* get events one by one */ + ev = (struct inotify_event *) &buf[i]; + + if (ev->len > 0) { + printf("event on file %s: %u\n", ev->name, ev->mask); + } + + /* OMG a new event ! Quick, raise an alert ! */ + if (!fork()) { + execvpe(cmd[0], cmd, environ); + } + + /* jump to the next one */ + i += EVENT_SIZE + ev->len; + } + /* wait before queuing events */ + sleep(timeout); + } + + return EXIT_SUCCESS; +}