int readlinkat(int dirfd, const char *path ", char *" buf ", size_t " bufsiz );
描述The readlinkat() system call operates in exactly the same way as readlink(2), except for the differences described in this manual page.
If the pathname given in path is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd (rather than relative to the current working directory of the calling process, as is done by readlink(2) for a relative pathname).
If the pathname given in path is relative and dirfd is the special value AT_FDCWD, thenpath is interpreted relative to the current working directory of the calling process (likereadlink(2)).
If the pathname given in path is absolute, then dirfd is ignored.
返回值On success, readlinkat() returns 0. On error, -1 is returned and errno is set to indicate the error.
错误The same errors that occur for readlink(2) can also occur for readlinkat(). The following additional errors can occur for readlinkat():
|EBADF||dirfd is not a valid file descriptor.|
|path is a relative path and dirfd is a file descriptor referring to a file other than a directory.|
注意See openat(2) for an explanation of the need for readlinkat().
遵循于This system call is non-standard but is proposed for inclusion in a future revision of POSIX.1.
版本readlinkat() was added to Linux in kernel 2.6.16.
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