link(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO

NAME

link- Link to a file

SYNOPSIS

#include <unistd.h>

int link(const char *existing, const char *new);

DESCRIPTION

The link() function creates a new link (directory entry) for the existing file and increments its link count by one. The existing argument points to a path name naming an existing file. The new argument points to a pathname naming the new directory entry to be created.

For creation of hard links, both files must be on the same file system. Both the old and the new link share equal access and rights to the underlying object. A calling process that has asserted the PRIV_SYS_CONFIG privilege may make multiple links to a directory.

Upon successful completion, link() marks for update the st_ctime field of the file. Also, the st_ctime and st_mtime fields of the directory that contains the new entry are marked for update.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned, no link is created, and errno is set to indicate the error.

ERRORS

The link() function will fail if:

EACCES

A component of either path prefix denies search permission. To override this restriction, the calling process may assert one or both of these privileges: PRIV_FILE_MAC_SEARCH and PRIV_FILE_DAC_SEARCH.

The requested link requires writing in a directory with a mode that denies write permission. To override this restriction, the calling process may assert one or both of these privileges: PRIV_FILE_MAC_WRITE and PRIV_FILE_DAC_WRITE.

The calling process needs both mandatory read and write access to existing and does not have that combination. To override this restriction, the calling process may assert one or both of these privileges: PRIV_FILE_MAC_READ and PRIV_FILE_MAC_WRITE.

EDQUOT

The directory where the entry for the new link is being placed cannot be extended because the user's quota of disk blocks on that file system has been exhausted.

EEXIST

The link named by new exists.

EFAULT

The existing or new argument points to an illegal address.

EINTR

A signal was caught during the execution of the link() function.

ELOOP

Too many symbolic links were encountered in translating path.

EMLINK

The maximum number of links to a file would be exceeded.

ENAMETOOLONG

The length of the existing or new argument exceeds PATH_MAX, or the length of a existing or new component exceeds NAME_MAX while _POSIX_NO_TRUNC is in effect.

ENOENT

The existing or new argument is a null pathname; a component of either path prefix does not exist; or the file named by existing does not exist.

ENOLINK

The existing or new argument points to a remote machine and the link to that machine is no longer active.

ENOSPC

The directory that would contain the link cannot be extended.

ENOTDIR

A component of either path prefix is not a directory.

EPERM

The file named by existing is a directory and the calling process has not asserted the PRIV_SYS_CONFIG privilege.

EROFS

The requested link requires writing in a directory on a read-only file system.

EXDEV

The link named by new and the file named by existing are on different logical devices (file systems).

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
MT-Level	Async-Signal-Safe

SUMMARY OF TRUSTED SOLARIS CHANGES

Appropriate privilege is required to override access checks.

If existing is a directory, the calling process must assert the PRIV_SYS_CONFIG privilege.

SEE ALSO

Trusted Solaris 8 Reference Manual

symlink(2), unlink(2)

Trusted Solaris 8  Last Revised 28 Dec 1996

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO