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symlink - make a new name for a file
#include <unistd.h> int symlink(const char *oldpath, const char *newpath); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): symlink(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _POSIX_C_SOURCE >= 200112L
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.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
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).) EDQUOT The user's quota of resources on the filesystem has been exhausted. The resources could be inodes or disk blocks, depending on the filesystem implementation. 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.
SVr4, 4.3BSD, POSIX.1-2001.
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 behavior is not desired, use link(2).
ln(1), lchown(2), link(2), lstat(2), open(2), readlink(2), rename(2), symlinkat(2), unlink(2), path_resolution(7), symlink(7)
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