76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2020 SUSE LLC
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*
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*/
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/*\
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* [Description]
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* Negative test for dup(2) (too many fds).
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*
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* [Algorithm]
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* Open the maximum allowed number of file descriptors and then try to call
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* dup() once more and verify it fails with EMFILE.
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*/
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#include <stdlib.h>
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#include "tst_test.h"
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int *fd;
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int nfds;
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static void run(void)
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{
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TEST(dup(fd[0]));
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if (TST_RET < -1) {
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tst_res(TFAIL, "Invalid dup() return value %ld", TST_RET);
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return;
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}
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if (TST_RET == -1) {
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if (TST_ERR == EMFILE)
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tst_res(TPASS | TTERRNO, "dup() failed as expected");
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else
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tst_res(TFAIL | TTERRNO, "dup() failed unexpectedly");
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return;
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}
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tst_res(TFAIL, "dup() succeeded unexpectedly");
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SAFE_CLOSE(TST_RET);
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}
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static void setup(void)
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{
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long maxfds;
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maxfds = sysconf(_SC_OPEN_MAX);
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if (maxfds == -1)
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tst_brk(TBROK, "sysconf(_SC_OPEN_MAX) failed");
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fd = SAFE_MALLOC(maxfds * sizeof(int));
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fd[0] = SAFE_OPEN("dupfile", O_RDWR | O_CREAT, 0700);
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for (nfds = 1; nfds < maxfds; nfds++) {
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fd[nfds] = SAFE_DUP(fd[0]);
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if (fd[nfds] >= maxfds - 1)
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break;
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}
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}
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static void cleanup(void)
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{
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int i;
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for (i = 0; i < nfds; i++)
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SAFE_CLOSE(fd[i]);
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}
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static struct tst_test test = {
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.test_all = run,
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.setup = setup,
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.cleanup = cleanup,
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.needs_tmpdir = 1,
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};
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