48 lines
947 B
C
48 lines
947 B
C
/*
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* Copyright (c) 2016-2018 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tests.h"
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#include <limits.h>
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#include <unistd.h>
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#include <sys/resource.h>
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static void
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move_fd(int *from, int *to)
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{
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for (; *to > *from; --*to) {
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if (dup2(*from, *to) != *to)
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continue;
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close(*from);
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*from = *to;
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break;
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}
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}
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void
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pipe_maxfd(int pipefd[2])
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{
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struct rlimit rlim;
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if (getrlimit(RLIMIT_NOFILE, &rlim))
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perror_msg_and_fail("getrlimit");
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if (rlim.rlim_cur < rlim.rlim_max) {
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struct rlimit rlim_new;
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rlim_new.rlim_cur = rlim_new.rlim_max = rlim.rlim_max;
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if (!setrlimit(RLIMIT_NOFILE, &rlim_new))
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rlim.rlim_cur = rlim.rlim_max;
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}
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if (pipe(pipefd))
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perror_msg_and_fail("pipe");
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int max_fd = (rlim.rlim_cur > 0 && rlim.rlim_cur < INT_MAX)
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? rlim.rlim_cur - 1 : INT_MAX;
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move_fd(&pipefd[1], &max_fd);
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--max_fd;
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move_fd(&pipefd[0], &max_fd);
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}
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