fdetach(3) [osf1 man page]
fdetach(3) Library Functions Manual fdetach(3) NAME
fdetach - Detaches a STREAMS-based file descriptor from a file in the file system name space LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <stropts.h> int fdetach( const char *path); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: fdetach(): XSH5.0 Refer to standards(5) for more information about industry standards and associated tags. PARAMETERS
Specifies the pathname of an existing regular file or directory. DESCRIPTION
The fdetach() function disassociates a STREAMS-based file descriptor from the file pointed to by the path parameter. The STREAMS-based file descriptor was associated with the file by a prior fattach() function. A successful call to the fdetach() function causes all path names that named the attached STREAMS file to again name the file to which the STREAMS file was attached. All subsequent operations on the file pointed to by the path parameter are performed on the underlying file and not on the STREAMS file. All open file descriptors established while the STREAMS file was attached to the file referenced by the path parameter still refer to the STREAMS file after the fdetach() function takes effect. If there are no open file descriptors or other references to the STREAMS file when a fdetach() function is called, a successful call has the same effect as performing the last close call on the attached file. The detach() function uses the File-on-File Mounting (FFM) file system. Instead of unmounting a file system on a mount point, the detach() function FFM unmounts a file descriptor from a mount point, which can be either a directory or a regular file. See ffm(4). RETURN VALUES
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. ERRORS
If any of the following conditions occurs, the fdetach() function sets errno to the value that corresponds to the condition. The user is not the owner of the file or does not have the correct permissions to access the file. [Tru64 UNIX] There is an active reference to a file located on the file system. [Tru64 UNIX] The path parameter points outside the process's allocated address space. The path parame- ter names a file that is not currently attached. Too many symbolic links were found when path was resolved. An element of the path param- eter does not name an existing file or path is an empty string. An element of the directory portion of the path parameter is not a direc- tory. [Tru64 UNIX] The size of a pathname component is longer than NAME_MAX when _POSIX_NO_TRUNC is in effect. The pathname length is longer than [PATH_MAX], or the length of the intermediate result of a pathname resolution of a symbolic link is longer than PATH_MAX. The effective user ID is not the owner of the file pointed to by thepath parameter or does not specify a user with the correct privileges. RESTRICTIONS
[Tru64 UNIX] The fdetach() function requires that the FFM_FS kernel option be configured. See System Administration for information on configuring kernel options. RELATED INFORMATION
Functions: fattach(3), isastream(3), umount(3) Commands: fdetach(8) Interfaces: streamio(7) Standards: standards(5) delim off fdetach(3)
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FDETACH(P) POSIX Programmer's Manual FDETACH(P) NAME
fdetach - detach a name from a STREAMS-based file descriptor (STREAMS) SYNOPSIS
#include <stropts.h> int fdetach(const char *path); DESCRIPTION
The fdetach() function shall detach a STREAMS-based file from the file to which it was attached by a previous call to fattach(). The path argument points to the pathname of the attached STREAMS file. The process shall have appropriate privileges or be the owner of the file. A successful call to fdetach() shall cause all pathnames that named the attached STREAMS file to again name the file to which the STREAMS file was attached. All subsequent operations on path shall operate on the underlying file and not on the STREAMS file. All open file descriptions established while the STREAMS file was attached to the file referenced by path shall still refer to the STREAMS file after the fdetach() has taken effect. If there are no open file descriptors or other references to the STREAMS file, then a successful call to fdetach() shall be equivalent to performing the last close() on the attached file. RETURN VALUE
Upon successful completion, fdetach() shall return 0; otherwise, it shall return -1 and set errno to indicate the error. ERRORS
The fdetach() function shall fail if: EACCES Search permission is denied on a component of the path prefix. EINVAL The path argument names a file that is not currently attached. ELOOP A loop exists in symbolic links encountered during resolution of the path argument. ENAMETOOLONG The size of a pathname exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}. ENOENT A component of path does not name an existing file or path is an empty string. ENOTDIR A component of the path prefix is not a directory. EPERM The effective user ID is not the owner of path and the process does not have appropriate privileges. The fdetach() function may fail if: ELOOP More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument. ENAMETOOLONG Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}. The following sections are informative. EXAMPLES
Detaching a File The following example detaches the STREAMS-based file /tmp/named-STREAM from the file to which it was attached by a previous, successful call to fattach(). Subsequent calls to open this file refer to the underlying file, not to the STREAMS file. #include <stropts.h> ... char *filename = "/tmp/named-STREAM"; int ret; ret = fdetach(filename); APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
fattach() , the Base Definitions volume of IEEE Std 1003.1-2001, <stropts.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 FDETACH(P)