2022-08-18 20:25:50 +00:00
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#define _GNU_SOURCE
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#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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2022-08-29 01:03:07 +00:00
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int dup3(int old, int new, int flags)
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2022-08-18 20:25:50 +00:00
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{
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int r;
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#ifdef SYS_dup2
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if (old==new) return __syscall_ret(-EINVAL);
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if (flags & O_CLOEXEC) {
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while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
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if (r!=-ENOSYS) return __syscall_ret(r);
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}
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while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
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if (flags & O_CLOEXEC) __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
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#else
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while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
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#endif
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return __syscall_ret(r);
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}
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