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Length: 978 (0x3d2)
Types: TextFile
Notes: UNIX file
Names: »dup.2«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/man/man2/dup.2«
.ig @(#)dup.2 2.1 7/1/84 @(#)Copyright (C) 1983 by National Semiconductor Corp. .. .TH DUP 2 .SH NAME dup, dup2 \- duplicate an open file descriptor .SH SYNOPSIS .nf .B dup(fildes) .B int fildes; .PP .B dup2(fildes, fildes2) .B int fildes, fildes2; .fi .SH DESCRIPTION Given a file descriptor returned from an .I open, .I pipe, or .I creat call, .I dup allocates another file descriptor synonymous with the original. The new file descriptor is returned. .PP In the second form of the call, .I fildes is a file descriptor referring to an open file, and .I fildes2 is a non-negative integer less than the maximum value allowed for file descriptors (approximately 19). .I Dup2 causes .I fildes2 to refer to the same file as .I fildes. If .I fildes2 already referred to an open file, it is closed first. .SH "SEE ALSO" creat(2), open(2), close(2), pipe(2) .SH DIAGNOSTICS The value \-1 is returned if: the given file descriptor is invalid; there are already too many open files.