Messages in this thread | | | Date | Fri, 14 Jun 2013 09:26:49 +0800 | From | majianpeng <> | Subject | [BUG] Using inotify on /proc/partitoins |
| |
Hi all, I wanted to monitor /proc/partitions using inotify.Although now i know it can't catch the event of write. But for read,it can't catch. The code is: int main() { int fd = inotify_init(); int wd; char buff[4096]; int ret; if (fd < 0) perror("inotify_init error\n");
wd = inotify_add_watch(fd, "/proc/partitions", IN_ACCESS); if (wd < 0) perror("inotify_add_watch error\n");
ret = read(fd, buff, 4096); if (ret < 0) perror("read error\n"); else printf("buff %s\n", buff); return 0; }
But when i call 'cat /proc/partitions',the program can't return. So i added some message in kernel in order to find the reason. In procfs for some files, the inode used this method to alloc. proc_lookup-->proc_lookup_de--->proc_get_inode-->new_inode_pseudo In new_inode_pseudo, it will alloc new inode so every open-operation procfs will alloc new inode. So inotify can't work.
I think it should add a flag which indicate file can't support inotify.Although there are a few files in procfs.
Thanks! Jianpeng
| |