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link(2)                          System Calls                          link(2)



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 exist-
       ing 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.

       To create 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 underly-
       ing object. Privileged processes can make multiple links  to  a  direc-
       tory.  Unless the caller is privileged, the file named by existing must
       not be 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 permis-
                       sion, or the  requested  link  requires  writing  in  a
                       directory with a mode that denies write permission.



       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 com-
                       ponent 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
                       {PRIV_SYS_LINKDIR} privilege is  not  asserted  in  the
                       effective set of the calling process.

                       The  effective  user ID does not match the owner of the
                       file and  the  {PRIV_FILE_LINK_ANY}  privilege  is  not
                       asserted in the effective set of the calling process.



       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:


       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).  ATTRIBUTE TYPEATTRIBUTE VALUE Interface  StabilityStan-
       dard MT-LevelAsync-Signal-Safe


SEE ALSO
       symlink(2), unlink(2), attributes(5), privileges(5), standards(5)



SunOS 5.10                        20 Jan 2003                          link(2)