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32 .\" @(#)close.2 8.2 (Berkeley) 4/19/94
33 .\" $FreeBSD: src/lib/libc/sys/close.2,v 1.10.2.6 2001/12/14 18:34:00 ru Exp $
40 .Nd delete a descriptor
50 call deletes a descriptor from the per-process object
52 If this is the last reference to the underlying object, the
53 object will be deactivated.
54 For example, on the last close of a file
57 pointer associated with the file is lost;
58 on the last close of a
60 associated naming information and queued data are discarded;
61 on the last close of a file holding an advisory lock
62 the lock is released (see further
64 However, the semantics of System V and
68 advisory record locks associated with a file for a given process
71 file descriptor for that file is closed by that process.
74 all associated file descriptors are freed, but since there is
75 a limit on active descriptors per processes, the
78 is useful when a large quantity of file descriptors are being handled.
80 When a process forks (see
82 all descriptors for the new child process reference the same
83 objects as they did in the parent before the fork.
84 If a new process is then to be run using
86 the process would normally inherit these descriptors. Most
87 of the descriptors can be rearranged with
93 is attempted, but if some of these descriptors will still
94 be needed if the execve fails, it is necessary to arrange for them
95 to be closed if the execve succeeds.
96 For this reason, the call
97 .Dq Li fcntl(d, F_SETFD, 1)
99 which arranges that a descriptor will be closed after a successful
101 .Dq Li fcntl(d, F_SETFD, 0)
102 restores the default,
103 which is to not close the descriptor.
112 is not an active descriptor.
114 An interrupt was received.
128 function call is expected to conform to
133 function call appeared in