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