fchdir (BPX1FCD, BPX4FCD) — Change the working directory

Function

The fchdir service changes your working directory from the current one to a new one. The working directory is the starting point for path searches of pathnames not beginning with a slash.

For corresponding service using a pathname, see chdir (BPX1CHD, BPX4CHD) — Change the working directory.

Requirements

Parameters

Directory_file_descriptor

Supplied parameter

Type:

Integer

Length:

Fullword

The name of a fullword containing the directory file descriptor that was returned when the directory was opened (see opendir (BPX1OPD, BPX4OPD) — Open a directory), which is to become the new working directory. It may also be specified as the name of a fullword containing the file descriptor of an open directory (see open (BPX1OPN, BPX4OPN) — Open a file).

Return_value

Returned parameter

Type:

Integer

Length:

Fullword

The name of a fullword where the fchdir service returns 0 if the request is successful, or -1 if it is not successful.

Return_code

Returned parameter

Type:

Integer

Length:

Fullword

The name of a fullword in which the fchdir service stores the return code. The fchdir service returns Return_code only if Return_value is -1. See z/OS UNIX System Services Messages and Codes for a complete list of possible return code values. The fchdir service can return one of the following values in the Return_code parameter:

Return_code	Explanation
EACCES	The calling process does not have search permission for the directory referenced by the file descriptor.
EBADF	The file descriptor parameter is not a valid file descriptor.
ENOTDIR	The open file descriptor does not refer to a directory. The following reason code can accompany the return code: JRChdNotDir.
EINTR	A signal was caught during the execution of fchdir().
EIO	An I/O error occurred while reading from or writing to the file system. The following reason codes can accompany the return code: JRQuiescing.

Reason_code

Returned parameter

Type:

Integer

Length:

Fullword

The name of a fullword where the fchdir service stores the reason code. The fchdir service returns a Reason_code only if Return_value is -1. Reason_code further qualifies the Return_code value. See z/OS UNIX System Services Messages and Codes for the reason codes.

Related services

• chdir (BPX1CHD, BPX4CHD) — Change the working directory
• closedir (BPX1CLD, BPX4CLD) — Close a directory
• getcwd (BPX1GCW, BPX4GCW) — Get the pathname of the working directory
• mkdir (BPX1MKD, BPX4MKD) — Make a directory
• opendir (BPX1OPD, BPX4OPD) — Open a directory
• readdir (BPX1RDD, BPX4RDD) — Read an entry from a directory
• rmdir (BPX1RMD, BPX4RMD) — Remove a directory
• unlink (BPX1UNL, BPX4UNL) — Remove a directory entry

Characteristics and restrictions

There are no restrictions on the use of the fchdir service.