xref: /386bsd/usr/share/man/cat2/unlink.0 (revision a2142627) 
1UNLINK(2)                 386BSD Programmer's Manual                 UNLINK(2)
2
3NNAAMMEE
4     uunnlliinnkk - remove directory entry
5
6SSYYNNOOPPSSIISS
7     ##iinncclluuddee <<uunniissttdd..hh>>
8
9     _i_n_t
10     uunnlliinnkk(_c_o_n_s_t _c_h_a_r *_p_a_t_h)
11
12DDEESSCCRRIIPPTTIIOONN
13     The uunnlliinnkk() function removes the link named by _p_a_t_h from its directory
14     and decrements the link count of the file which was referenced by the
15     link.  If that decrement reduces the link count of the file to zero, and
16     no process has the file open, then all resources associated with the file
17     are reclaimed.  If one or more process have the file open when the last
18     link is removed, the link is removed, but the removal of the file is
19     delayed until all references to it have been closed.
20
21RREETTUURRNN VVAALLUUEESS
22     Upon successful completion, a value of 0 is returned.  Otherwise, a value
23     of -1 is returned and _e_r_r_n_o is set to indicate the error.
24
25EERRRROORRSS
26     The uunnlliinnkk() succeeds unless:
27
28     [ENOTDIR]       A component of the path prefix is not a directory.
29
30     [EINVAL]        The pathname contains a character with the high-order bit
31                     set.
32
33     [ENAMETOOLONG]  A component of a pathname exceeded 255 characters, or an
34                     entire path name exceeded 1023 characters.
35
36     [ENOENT]        The named file does not exist.
37
38     [EACCES]        Search permission is denied for a component of the path
39                     prefix.
40
41     [EACCES]        Write permission is denied on the directory containing
42                     the link to be removed.
43
44     [ELOOP]         Too many symbolic links were encountered in translating
45                     the pathname.
46
47     [EPERM]         The named file is a directory and the effective user ID
48                     of the process is not the super-user.
49
50     [EPERM]         The directory containing the file is marked sticky, and
51                     neither the containing directory nor the file to be
52                     removed are owned by the effective user ID.
53
54     [EBUSY]         The entry to be unlinked is the mount point for a mounted
55                     file system.
56
57     [EIO]           An I/O error occurred while deleting the directory entry
58                     or deallocating the inode.
59
60     [EROFS]         The named file resides on a read-only file system.
61
62     [EFAULT]        _P_a_t_h points outside the process's allocated address
63                     space.
64
65SSEEEE AALLSSOO
66     close(2),  link(2),  rmdir(2)
67
68HHIISSTTOORRYY
69     An uunnlliinnkk function call appeared in Version 6 AT&T UNIX.
70
714th Berkeley Distribution       March 10, 1991                               2
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