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| author | Tobias Klauser <tklauser@distanz.ch> | 2008-01-27 11:37:44 +0100 |
|---|---|---|
| committer | Tobias Klauser <tklauser@xenon.tklauser.home> | 2008-01-27 11:37:44 +0100 |
| commit | 7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch) | |
| tree | b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/MAN/dup.htm | |
Initial import (2.0.2-6)2.0.2-6
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| -rw-r--r-- | reference/C/MAN/dup.htm | 98 |
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diff --git a/reference/C/MAN/dup.htm b/reference/C/MAN/dup.htm new file mode 100644 index 0000000..4ade0c3 --- /dev/null +++ b/reference/C/MAN/dup.htm @@ -0,0 +1,98 @@ +<TITLE>dup</TITLE> +<body bgcolor="#ffffcc"> +<hr> +<pre> + + + +<h3>DUP(2) Linux Programmer's Manual DUP(2) +</h3> + +<h3>NAME +</h3> dup, dup2 - duplicate a file descriptor + +<h3>SYNOPSIS +</h3> #include <unistd.h> + + int dup(int oldfd); + int dup2(int oldfd, int newfd); + +<h3>DESCRIPTION +</h3> dup and dup2 create a copy of the file descriptor oldfd. + + The old and new descriptors may be used interchangeably. + They share locks, file position pointers and flags; for + example, if the file position is modified by using lseek + on one of the descriptors, the position is also changed + for the other. + + The two descriptors do not share the close-on-exec flag, + however. + + dup uses the lowest-numbered unused descriptor for the new + descriptor. + + dup2 makes newfd be the copy of oldfd, closing newfd first + if necessary. + +<h3>RETURN VALUE +</h3> dup and dup2 return the new descriptor, or -1 if an error + occurred (in which case, errno is set appropriately). + +<h3>ERRORS +</h3> EBADF oldfd isn't an open file descriptor, or newfd is + out of the allowed range for file descriptors. + + EMFILE The process already has the maximum number of file + descriptors open and tried to open a new one. + +<h3>WARNING +</h3> The error returned by dup2 is different to that returned + by fcntl(...,F_DUPFD,...) when newfd is out of range. On + some systems dup2 also sometimes returns EINVAL like + F_DUPFD. + +<h3>CONFORMING TO +</h3> SVID, AT&T, POSIX, X/OPEN, BSD 4.3 + +</pre> +<hr> +<h3>SEE ALSO +</h3><p> +<a href=fcntl.htm>fcntl</a>, +<a href=open.htm>open</a>, +<pre> + + + + + + + + +<h3>Linux 1.1.46 21 August 1994 1 +</h3> + +
</pre> +<P> +<hr> +<p> +<center> +<table border=2 width=80%> +<tr align=center> +<td width=25%> +<a href=../cref.html>Top</a> +</td><td width=25%> +<a href=../master_index.html>Master Index</a> +</td><td width=25%> +<a href=../SYNTAX/keywords.html>Keywords</a> +</td><td width=25%> +<a href=../FUNCTIONS/funcref.htm>Functions</a> +</td> +</tr> +</table> +</center> +<p> +<hr> + +This manual page was brought to you by <i>mjl_man V-2.0</i> |