inotify_add_watch - 添加監視到一個初始化的inotify實例

內容簡介

#include <sys/inotify.h>

int inotify_add_watch(int fd**, const char *pathname, uint32_t** mask**);**

描述

inotify_add_watch () adds a new watch, or modifies an existing watch, for the file whose location is specified in  pathname ; the caller must have read permission for this file. The  fd  argument is a file descriptor referring to the inotify instance whose watch list is to be modified. The events to be monitored for  pathname  are specified in the  mask bit-mask argument. See  inotify (7) for a description of the bits that can be set in  mask .

A successful call to inotify_add_watch() returns the unique watch descriptor associated with pathname for this inotify instance. If pathname was not previously being watched by this inotify instance, then the watch descriptor is newly allocated. If pathname was already being watched, then the descriptor for the existing watch is returned.

The watch descriptor is returned by later read(2)s from the inotify file descriptor. These reads fetch inotify_event structures indicating file system events; the returned watch descriptor identifies the object for which the event occurred.

返回值

On success,  inotify_add_watch () returns a non-negative watch descriptor. On error -1 is returned and  errno  is set appropriately.

錯誤

標籤

描述

EACCESS

 

Read access to the given file is not permitted.

EBADF

The given file descriptor is not valid.

EFAULT

pathname yiibais outside of the process’s accessible address space.

EINVAL

The given event mask contains no legal events; or fd is not an inotify file descriptor.

ENOMEM

Insufficient kernel memory was available.

ENOSPC

The user limit on the total number of inotify watches was reached or the kernel failed to allocate a needed resource.

歷史

Inotify was merged into the 2.6.13 Linux kernel.

遵循於

This system call is Linux specific.

另請參閱

• inotify_init (2)

• inotify_rm_watch (2)