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CHDIR(2) System Calls Manual CHDIR(2)

chdir, fchdir — change current working directory

#include <unistd.h>

int
chdir(const char *path);

int
fchdir(int fd);

The path argument points to the pathname of a directory. The () function causes the named directory to become the current working directory, that is, the starting point for path searches of pathnames not beginning with a slash (‘/’).

The () function causes the directory referenced by fd to become the current working directory, the starting point for path searches of pathnames not beginning with a slash (‘/’).

In order for a directory to become the current directory, a process must have execute (search) access to the directory.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

chdir() will fail and the current working directory will be unchanged if one or more of the following are true:

[]
A component of the path prefix is not a directory.
[]
A component of a pathname exceeded NAME_MAX characters, or an entire pathname (including the terminating NUL) exceeded PATH_MAX bytes.
[]
The named directory does not exist.
[]
Too many symbolic links were encountered in translating the pathname.
[]
Search permission is denied for any component of the pathname.
[]
path points outside the process's allocated address space.
[]
An I/O error occurred while reading from the file system.

fchdir() will fail and the current working directory will be unchanged if one or more of the following are true:

[]
Search permission is denied for the directory referenced by the file descriptor.
[]
The file descriptor does not reference a directory.
[]
The argument fd is not a valid file descriptor.
[]
An I/O error occurred while reading from the file system.

chroot(2)

The chdir() and fchdir() functions are expected to conform to IEEE Std 1003.1-2008 (“POSIX.1”).

The chdir() system call first appeared in Version 1 AT&T UNIX, and fchdir() in 4.3BSD-Reno.

September 10, 2015 OpenBSD-6.7