Linux Blog

SYMLINK

Section: Linux Programmer's Manual (2)
Updated: 2004-06-23
Index Return to Main Contents
 

NAME

symlink - make a new name for a file  

SYNOPSIS

#include <unistd.h>

int symlink(const char *oldpath, const char *newpath);  

DESCRIPTION

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.  

RETURN VALUE

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

ERRORS

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(7).)
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.
 

CONFORMING TO

SVr4, 4.3BSD, POSIX.1-2001.  

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(2).  

SEE ALSO

ln(1), link(2), lstat(2), open(2), readlink(2), rename(2), symlinkat(2), unlink(2) path_resolution(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO




Random Man Pages:
i810
time
htfuzzy
ptmx