dup2 on Sys5r2 ish box

[Brandon S. Allbery KB8JRR/AA]

As quoted from <2180 at estevax.UUCP> by iain at estevax.UUCP (Hr Iain Lea):
+---------------
| I am porting a program from BSD to a Sys5r2 ish derivative and need the
| dup2() function call.
+---------------

Is this one in the FAQ?

/*
 * Near-duplicate for dup2().  ("Near"?  We discussed this for a whole bloody
 * month --- I don't want to discuss it any more.  BSD and System V have
 * enough differing errno values that that part is pointless anyway.)
 *
 * Caveats: doesn't necessarily return the same errno values on failure; does
 * not leave f2 open if the dup fails.
 */

#include <ioctl.h>
#include <errno.h>

#define dup2(f1,f2) (close(f2),fcntl(f1,F_DUPFD,f2))

++Brandon

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