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HP-UX 11i Version 3: February 2007

Technical documentation

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fdetach() — detach a name from a STREAMS file descriptor


#include <stropts.h>

int fdetach(const char *path);


The fdetach() function detaches a file descriptor from a name in the file system designated by path. path specifies the path name of an existing object in the file system name space that was previously attached (see fattach(3C)). As a result of the fdetach() operation, the node's status and permissions return to the state prior to the file attaching to the node. Any later operations on path will affect only the file system node and not the attached file.

Security Restrictions

The fdetach() function is restricted to superusers, or users with the OWNER privilege, or those who own path and have write permission. In addition to having the OWNER privilege, DACREAD or DACWRITE privileges may also be required. See privileges(5) for more information about privileged access on systems that support fine-grained privileges.


Upon successful completion, the fdetach() function returns a value of 0 (zero). Otherwise, it returns a value of -1 is returned, and errno is set to indicate the error.


If any of the following conditions occurs, the fdetach() function sets errno to the value that corresponds to the condition.


The path parameter points outside the process' allocated address space.


The user does not have the correct permission to access the file. See the Security Restrictions section.


The object pointed to by the path parameter is not fattached to a STREAMS device or pipe.


When path was translated, too many symbolic links were found.


The path parameter points to a path name that does not exist.


The directory portion of the path parameter does not exist.


The size of a path name component is longer than NAME_MAX when _POSIX_NO_TRUNC is in effect, or the path name length is longer than PATH_MAX.


The current effective user ID is not the owner of the existing object specified by the path parameter, or the current effective user ID does not specify a user with the correct permissions.


fdetach(): SVID3

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