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FHLINK(2) System Calls Manual FHLINK(2) NAME fhlink, fhlinkat -- make a hard file link LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> int fhlink(fhandle_t *fhp, const char *to); int fhlinkat(fhandle_t *fhp, int tofd, const char *to); DESCRIPTION The fhlink() system call atomically creates the specified directory en- try (hard link) to with the attributes of the underlying object pointed at by fhp. If the link is successful: the link count of the underlying object is incremented; fhp and to share equal access and rights to the underlying object. If fhp is removed, the file to is not deleted and the link count of the underlying object is decremented. The object pointed at by the fhp argument must exist for the hard link to succeed and both fhp and to must be in the same file system. The fhp argument may not be a directory. The fhlinkat() system call is equivalent to fhlink except in the case where to is a relative paths. In this case a relative path to is in- terpreted relative to the directory associated with the file descriptor tofd instead of the current working directory. If fhlinkat() is passed the special value AT_FDCWD in the tofd parame- ter, the current working directory is used for the to argument. If tofd has value AT_FDCWD, the behavior is identical to a call to link(). Unless flag contains the AT_SYMLINK_FOLLOW flag, if fhp names a sym- bolic link, a new link is created for the symbolic link fhp and not its target. RETURN VALUES The link() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS The fhlink() system call will fail and no link will be created if: [ENOTDIR] A component of to prefix is not a directory. [ENAMETOOLONG] A component of to exceeded 255 characters, or entire length of to name exceeded 1023 characters. [ENOENT] A component of to prefix does not exist. [EOPNOTSUPP] The file system containing the file pointed at by fhp does not support links. [EMLINK] The link count of the file pointed at by fhp would exceed 32767. [EACCES] A component of to prefix denies search permission. [EACCES] The requested link requires writing in a directory with a mode that denies write permission. [ELOOP] Too many symbolic links were encountered in trans- lating one of the pathnames. [ENOENT] The file pointed at by fhp does not exist. [EEXIST] The link named by to does exist. [EPERM] The file pointed at by fhp is a directory. [EPERM] The file pointed at by fhp has its immutable or ap- pend-only flag set, see the chflags(2) manual page for more information. [EPERM] The parent directory of the file named by to has its immutable flag set. [EXDEV] The link named by to and the file pointed at by fhp are on different file systems. [ENOSPC] The directory in which the entry for the new link is being placed cannot be extended because there is no space left on the file system containing the direc- tory. [EDQUOT] The directory in which the entry for the new link is being placed cannot be extended because the user's quota of disk blocks on the file system containing the directory has been exhausted. [EIO] An I/O error occurred while reading from or writing to the file system to make the directory entry. [EINTEGRITY] Corrupted data was detected while reading from the file system. [EROFS] The requested link requires writing in a directory on a read-only file system. [EFAULT] One of the pathnames specified is outside the process's allocated address space. [ESTALE] The file handle fhp is no longer valid In addition to the errors returned by the fhlink(), the fhlinkat() sys- tem call may fail if: [EBADF] The fhp or to argument does not specify an absolute path and the tofd argument, is not AT_FDCWD nor a valid file descriptor open for searching. [EINVAL] The value of the flag argument is not valid. [ENOTDIR] The fhp or to argument is not an absolute path and tofd is not AT_FDCWD nor a file descriptor associ- ated with a directory. SEE ALSO fhopen(2), fhreadlink(2), fhstat(2) HISTORY The fhlink() and fhlinkat() system calls first appeared in FreeBSD 12.1. FreeBSD 13.2 November 30, 2022 FHLINK(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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