chdir, fchdir - 改变工作目录
int chdir(const char *path); int fchdir(int fd);
chdir() changes the current working directory to that specified in path. fchdir() is identical to chdir(); the only difference is that the directory is given as an open file descriptor.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
Depending on the file system, other errors can be returned. The more general errors for chdir() are listed below:
|EACCES||Search permission is denied for one of the directories in the path prefix of path. (See also path_resolution(2).)|
|EFAULT||path points outside your accessible address space.|
|EIO||An I/O error occurred.|
|ELOOP||Too many symbolic links were encountered in resolving path.|
|ENAMETOOLONG||path is too long.|
|ENOENT||The file does not exist.|
|ENOMEM||Insufficient kernel memory was available.|
|ENOTDIR||A component of path is not a directory.|
|The general errors for fchdir() are listed below:|
|EACCES||Search permission was denied on the directory open on fd.|
|EBADF||fd is not a valid file descriptor.|
A child process created via fork(2) inherits its parent’s current working directory. The current working directory is left unchanged by execve(2).
The prototype for fchdir() is only available if _BSD_SOURCE is defined, or_XOPEN_SOURCE is defined with the value 500.
SVr4, 4.4BSD, POSIX.1-2001.