close man page on NetBSD

Man page or keyword search:  
man Server   9087 pages
apropos Keyword Search (all sections)
Output format
NetBSD logo
[printable version]

CLOSE(2)		    BSD System Calls Manual		      CLOSE(2)

NAME
     close — delete a descriptor

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     close(int d);

DESCRIPTION
     The close() system call deletes a descriptor from the per-process object
     reference table.  If this is the last reference to the underlying object,
     the object will be deactivated.  For example, on the last close of a file
     the current seek pointer associated with the file is lost; on the last
     close of a socket(2) associated naming information and queued data are
     discarded; on the last close of a file holding an advisory lock the lock
     is released (see flock(2)).

     When a process exits, all associated descriptors are freed, but since
     there is a limit on active descriptors per processes, the close() system
     call is useful when a large quantity of file descriptors are being han‐
     dled.

     When a process calls fork(2), all descriptors for the new child process
     reference the same objects as they did in the parent before the fork().
     If a new process is then to be run using execve(2), the process would
     normally inherit these descriptors.  Most of the descriptors can be rear‐
     ranged with dup2(2) or deleted with close() before the execve() is
     attempted, but if some of these descriptors will still be needed if the
     execve() fails, it is necessary to arrange for them to be closed only if
     the execve() succeeds.  For this reason, the system call

	   fcntl(d, F_SETFD, 1);

     is provided, which arranges that a descriptor “d” will be closed after a
     successful execve(); the system call

	   fcntl(d, F_SETFD, 0);

     restores the default, which is to not close descriptor “d”.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.

ERRORS
     close() will fail if:

     [EBADF]		d is not an active descriptor.

     [EINTR]		An interrupt was received.

SEE ALSO
     accept(2), execve(2), fcntl(2), flock(2), open(2), pipe(2), socket(2),
     socketpair(2)

STANDARDS
     The close() function conforms to ISO/IEC 9945-1:1990 (“POSIX.1”).

BSD				April 19, 1994				   BSD
[top]
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server NetBSD

List of man pages available for NetBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net