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Annotation of coherent/g/usr/lib/uucp/tay104/unix/dup2.c, revision 1.1.1.1

1.1       root        1: /* dup2.c
                      2:    The Unix dup2 function, for systems which only have dup.
                      3: 
                      4:    Copyright (C) 1985, 1986, 1987, 1988, 1990 Free Software Foundation, Inc.
                      5: 
                      6:    This file is part of the Taylor UUCP package.
                      7: 
                      8:    This program is free software; you can redistribute it and/or
                      9:    modify it under the terms of the GNU General Public License as
                     10:    published by the Free Software Foundation; either version 2 of the
                     11:    License, or (at your option) any later version.
                     12: 
                     13:    This program is distributed in the hope that it will be useful, but
                     14:    WITHOUT ANY WARRANTY; without even the implied warranty of
                     15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     16:    General Public License for more details.
                     17: 
                     18:    You should have received a copy of the GNU General Public License
                     19:    along with this program; if not, write to the Free Software
                     20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     21: 
                     22:    The author of the program may be contacted at [email protected] or
                     23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
                     24:    */
                     25: 
                     26: #include "uucp.h"
                     27: #include "sysdep.h"
                     28: 
                     29: #include <errno.h>
                     30: 
                     31: #if HAVE_FCNTL_H
                     32: #include <fcntl.h>
                     33: #else
                     34: #if HAVE_SYS_FILE_H
                     35: #include <sys/file.h>
                     36: #endif
                     37: #endif
                     38: 
                     39: /* I basically took this from the emacs 18.57 distribution, although I
                     40:    cleaned it up a bit and made it POSIX compliant.  */
                     41: 
                     42: int
                     43: dup2 (oold, onew)
                     44:      int oold;
                     45:      int onew;
                     46: {
                     47:   if (oold == onew)
                     48:     return onew;
                     49:   (void) close (onew);
                     50:   
                     51: #ifdef F_DUPFD
                     52:   return fcntl (oold, F_DUPFD, onew);
                     53: #else
                     54:   {
                     55:     int onext, oret, isave;
                     56: 
                     57:     onext = dup (oold);
                     58:     if (onext == onew)
                     59:       return onext;
                     60:     if (onext < 0)
                     61:       return -1;
                     62:     oret = dup2 (oold, onew);
                     63:     isave = errno;
                     64:     (void) close (onext);
                     65:     errno = isave;
                     66:     return oret;
                     67:   }
                     68: #endif
                     69: }

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