ssize_t readlink(const char *path, char *buf, size_t bufsiz);
描述readlink() places the contents of the symbolic link path in the buffer buf, which has sizebufsiz. readlink() does not append a null byte to buf. It will truncate the contents (to a length of bufsiz characters), in case the buffer is too small to hold all of the contents.
返回值The call returns the count of characters placed in the buffer if it succeeds, or a -1 if an error occurs, placing the error code in errno.
|EACCES||搜索权限的路径前缀的组成部分将被拒绝. (See also path_resolution(2).)|
|EINVAL||bufsiz is not positive.|
|EINVAL||The named file is not a symbolic link.|
|EIO||An I/O error occurred while reading from the file system.|
|ELOOP||Too many symbolic links were encountered in translating the pathname.|
遵循于4.4BSD (the readlink() function call appeared in 4.2BSD), POSIX.1-2001.
HISTORYIn versions of glibc up to and including glibc 2.4, the return type of readlink() was declared as int. Nowadays, the return type is declared as ssize_t, as (newly) required in POSIX.1-2001.
注意：建议每个人选自己的技术方向加群，同一个QQ最多限加 3 个群。