symlink: vytvořte nový název souboru

Originální popis anglicky: symlink - make a new name for a file

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#include <unistd.h> int symlink(const char *oldpath, const char *newpath);

POPIS / INSTRUKCE

symlink creates a symbolic link named newpath which contains the string oldpath. Symbolic links are interpreted at run-time as if the contents of the link had been substituted into the path being followed to find a file or directory. Symbolic links may contain .. path components, which (if used at the start of the link) refer to the parent directories of that in which the link resides. A symbolic link (also known as a soft link) may point to an existing file or to a nonexistent one; the latter case is known as a dangling link. The permissions of a symbolic link are irrelevant; the ownership is ignored when following the link, but is checked when removal or renaming of the link is requested and the link is in a directory with the sticky bit (S_ISVTX) set. If newpath exists it will not be overwritten.

NÁVRATOVÁ HODNOTA

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

CHYBY / ERRORY

EACCES

Write access to the directory containing newpath is denied, or one of the directories in the path prefix of newpath did not allow search permission. (See also path_resolution(2).)

EEXIST

newpath already exists.

EFAULT

oldpath or newpath points outside your accessible address space.

EIO

An I/O error occurred.

ELOOP

Too many symbolic links were encountered in resolving newpath.

ENAMETOOLONG

oldpath or newpath was too long.

ENOENT

A directory component in newpath does not exist or is a dangling symbolic link, or oldpath is the empty string.

ENOMEM

Insufficient kernel memory was available.

ENOSPC

The device containing the file has no room for the new directory entry.

ENOTDIR

A component used as a directory in newpath is not, in fact, a directory.

EPERM

The filesystem containing newpath does not support the creation of symbolic links.

EROFS

newpath is on a read-only filesystem.

NOTES

No checking of oldpath is done. Deleting the name referred to by a symlink will actually delete the file (unless it also has other hard links). If this behaviour is not desired, use link.

ODPOVÍDAJÍCÍ

SVr4, SVID, POSIX, BSD 4.3. SVr4 documents additional error codes SVr4, SVID, BSD 4.3, X/OPEN. SVr4 documents additional error codes EDQUOT and ENOSYS. See open(2) re multiple files with the same name, and NFS.

SOUVISEJÍCÍ

ln(1), link(2), lstat(2), open(2), path_resolution(2), readlink(2), rename(2), unlink(2)