45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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#define _GNU_SOURCE
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#include <caml/mlvalues.h>
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#include "unixsupport.h"
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#include <fcntl.h>
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CAMLprim value unix_dup2(value cloexec, value fd1, value fd2)
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{
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if (Int_val(fd2) == Int_val(fd1)) {
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/* In this case, dup3 fails and dup2 does nothing. */
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/* Just apply the cloexec flag to fd2, if it is given. */
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if (Is_block(cloexec)) {
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if (Bool_val(Field(cloexec, 0)))
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unix_set_cloexec(Int_val(fd2), "dup2", Nothing);
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else
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unix_clear_cloexec(Int_val(fd2), "dup2", Nothing);
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}
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} else {
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#ifdef HAS_DUP3
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if (dup3(Int_val(fd1), Int_val(fd2),
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unix_cloexec_p(cloexec) ? O_CLOEXEC : 0) == -1)
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uerror("dup2", Nothing);
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#else
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if (dup2(Int_val(fd1), Int_val(fd2)) == -1) uerror("dup2", Nothing);
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if (unix_cloexec_p(cloexec))
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unix_set_cloexec(Int_val(fd2), "dup2", Nothing);
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#endif
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}
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return Val_unit;
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}
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