47 lines
2.5 KiB
C
47 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/errno.h"
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#define __NR_dup3_linux 0x0124 /*RHEL5:CVE-2010-3301*/
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int32_t dup3$sysv(int32_t oldfd, int32_t newfd, int flags) {
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static bool once, demodernize;
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int olderr, fd;
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if (!once) {
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once = true;
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olderr = errno;
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fd = __dup3$sysv(oldfd, newfd, flags);
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if ((fd == -1 && errno == ENOSYS) || fd == __NR_dup3_linux) {
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demodernize = true;
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errno = olderr;
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goto OldSkool;
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}
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} else if (demodernize) {
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goto OldSkool;
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} else {
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fd = __dup3$sysv(oldfd, newfd, flags);
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}
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return fd;
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OldSkool:
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fd = dup2$sysv(oldfd, newfd);
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if (flags) fd = fixupnewfd$sysv(fd, flags);
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return fd;
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}
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