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#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"
int dup2(int old, int new)
{
int r;
#ifdef SYS_dup2
while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
#else
if (old==new) {
r = __syscall(SYS_fcntl, old, F_GETFD);
if (r >= 0) return old;
} else {
while ((r=__syscall(SYS_dup3, old, new, 0))==-EBUSY);
}
#endif
return __syscall_ret(r);
}
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