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sysfs中有事件通知机制,我找了下,发现有下面的代码可用

#include <sys/select.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>

/**
* Compilation : gcc inotify.c -o inotify -O2 -Wall -W -Werror -ansi -pedantic
**/

int fd, wd;

void sigint_handler(int signum)
{
(void) signum;

/* Nous ne surveillons plus ce fichier/répertoire */
if (inotify_rm_watch(fd, wd)) {
perror("inotify_rm_watch");
exit(EXIT_FAILURE);
}

/* Fermeture du descripteur de fichier obtenu lors de l'initialisation d'inotify */
if (close(fd) < 0) {
perror("close");
exit(EXIT_FAILURE);
}

exit(EXIT_SUCCESS);
}

void afficher_masque(int mask)
{
printf("Event : ");
if (mask & IN_ACCESS)
printf("IN_ACCESS");
if (mask & IN_MODIFY)
printf("IN_MODIFY");
if (mask & IN_ATTRIB)
printf("IN_ATTRIB");
if (mask & IN_CLOSE)
printf("IN_CLOSE");
if (mask & IN_OPEN)
printf("IN_OPEN");
if (mask & IN_MOVED_FROM)
printf("IN_MOVED_FROM");
if (mask & IN_MOVED_TO)
printf("IN_MOVED_TO");
if (mask & IN_MOVE_SELF)
printf("IN_MOVE_SELF");
if (mask & IN_DELETE)
printf("IN_DELETE");
if (mask & IN_CREATE)
printf("IN_CREATE");
if (mask & IN_DELETE_SELF)
printf("IN_DELETE_SELF");
if (mask & IN_UNMOUNT)
printf("IN_UNMOUNT");
if (mask & IN_Q_OVERFLOW)
printf("IN_Q_OVERFLOW");
if (mask & IN_IGNORED)
printf("IN_IGNORED");
if (mask & IN_ISDIR)
printf("IN_ISDIR");
else
printf("(file)");
}

int main(int argc, char *argv[])
{
size_t r;
fd_set fds;
char buffer[8192];
struct inotify_event *event;

if (argc != 2) {
fprintf(stderr, "usage : %s file or directory to monitor\n", argv[0]);
return EXIT_FAILURE;
}

/* Initialisation d'inotify */
fd = inotify_init();
if (fd < 0) {
perror("inotify_init");
return EXIT_FAILURE;
}

/* Surveillance du fichier/répertoire passé en paramètre
* On accepte tous les évènements possibles */
wd = inotify_add_watch(fd, argv[1], IN_ALL_EVENTS);
if (wd < 0) {
perror("inotify_add_watch");
return EXIT_FAILURE;
}

printf("Monitoring : '%s' (number = %d)\n", argv[1], wd);

/* Capture de SIGINT (Ctrl + C) */
signal(SIGINT, sigint_handler);

while (1) {
FD_ZERO(&fds);
FD_SET(fd, &fds);
if (select(fd + 1, &fds, NULL, NULL, 0) <= 0) {
continue;
}

/* Obtention des informations sur l'évènement qui vient de se produire */
r = read(fd, buffer, sizeof(buffer));
if (r <= 0) {
perror("read");
return EXIT_FAILURE;
}

event = (struct inotify_event *) buffer;
printf("Monitored file n°%d\t", event->wd);
afficher_masque(event->mask);

if (event->len) {
printf("\tObject : %s", event->name);
}
printf("\n");

/* Gedit act strangly, reload the file if we get an IN_DELETE_SELF event.
if (event->mask & IN_DELETE_SELF) {
printf("Reloding watch");
inotify_rm_watch(fd, wd);
wd = inotify_add_watch(fd, argv[1], IN_ALL_EVENTS);
if (wd < 0) {
perror("inotify_add_watch");
return EXIT_FAILURE;
}*/
}

return EXIT_FAILURE;
}

文档看:linux/Documentation/filesystem/inotify.txt

posted on 2007-10-30 11:51 hzb 阅读(474) 评论(0)  编辑 收藏 引用

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