48 lines
2.5 KiB
C
48 lines
2.5 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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