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28 .\" @(#)close.2 8.2 (Berkeley) 4/19/94
29 .\" $FreeBSD: src/lib/libc/sys/close.2,v 1.10.2.6 2001/12/14 18:34:00 ru Exp $
30 .\" $DragonFly: src/lib/libc/sys/close.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
37 .Nd delete a descriptor
47 call deletes a descriptor from the per-process object
49 If this is the last reference to the underlying object, the
50 object will be deactivated.
51 For example, on the last close of a file
54 pointer associated with the file is lost;
55 on the last close of a
57 associated naming information and queued data are discarded;
58 on the last close of a file holding an advisory lock
59 the lock is released (see further
61 However, the semantics of System V and
65 advisory record locks associated with a file for a given process
68 file descriptor for that file is closed by that process.
71 all associated file descriptors are freed, but since there is
72 a limit on active descriptors per processes, the
75 is useful when a large quantity of file descriptors are being handled.
77 When a process forks (see
79 all descriptors for the new child process reference the same
80 objects as they did in the parent before the fork.
81 If a new process is then to be run using
83 the process would normally inherit these descriptors. Most
84 of the descriptors can be rearranged with
90 is attempted, but if some of these descriptors will still
91 be needed if the execve fails, it is necessary to arrange for them
92 to be closed if the execve succeeds.
93 For this reason, the call
94 .Dq Li fcntl(d, F_SETFD, 1)
96 which arranges that a descriptor will be closed after a successful
98 .Dq Li fcntl(d, F_SETFD, 0)
100 which is to not close the descriptor.
109 is not an active descriptor.
111 An interrupt was received.
125 function call is expected to conform to
130 function call appeared in