GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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dup(2) |
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dup duplicate an open file descriptor (dup = 41.; not in
assembler)
(file descriptor in r0)
sys dup dup(fildes)
int fildes; Given a file descriptor returned from an or
call, will allocate another file descriptor synonymous with
the original. The new file descriptor is returned in r0. is
used more to reassign the value of file descriptors than to
genuinely duplicate a file descriptor. Since the algorithm
to allocate file descriptors returns the lowest available
value, combinations of and can be used to manipulate file
descriptors in a general way. This is handy for manipulating
standard input and/or standard output. creat (II), open
(II), close (II), pipe (II) The error bit (c-bit) is set if:
the given file descriptor is invalid; there are already too
many open files. From C, a 1 returned value indicates an
error.
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dup(2) | |