86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Zilogic Systems Pvt. Ltd., 2020
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* Email: code@zilogic.com
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*/
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/*
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* Test mmap with MAP_FIXED_NOREPLACE flag
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*
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* We are testing the MAP_FIXED_NOREPLACE flag of mmap() syscall. To check
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* if an attempt to mmap at an exisiting mapping fails with EEXIST.
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* The code allocates a free address by passing NULL to first mmap call
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* Then tries to mmap with the same address using MAP_FIXED_NOREPLACE flag
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* and the mapping fails as expected.
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "lapi/mmap.h"
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#include "tst_test.h"
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static int fd_file1;
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static int fd_file2;
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static void *mapped_address;
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static const char str[] = "Writing to mapped file";
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#define FNAME1 "file1_to_mmap"
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#define FNAME2 "file2_to_mmap"
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static void setup(void)
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{
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fd_file1 = SAFE_OPEN(FNAME1, O_CREAT | O_RDWR, 0600);
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fd_file2 = SAFE_OPEN(FNAME2, O_CREAT | O_RDWR, 0600);
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}
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static void cleanup(void)
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{
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int str_len;
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str_len = strlen(str);
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if (fd_file2 > 0)
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SAFE_CLOSE(fd_file2);
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if (fd_file1 > 0)
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SAFE_CLOSE(fd_file1);
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if (mapped_address)
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SAFE_MUNMAP(mapped_address, str_len);
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}
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static void test_mmap(void)
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{
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int str_len;
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void *address;
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str_len = strlen(str);
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SAFE_WRITE(1, fd_file1, str, str_len);
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mapped_address = SAFE_MMAP(NULL, str_len, PROT_WRITE,
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MAP_PRIVATE, fd_file1, 0);
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SAFE_WRITE(1, fd_file2, str, str_len);
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address = mmap(mapped_address, str_len, PROT_WRITE,
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MAP_PRIVATE | MAP_FIXED_NOREPLACE, fd_file2, 0);
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if (address == MAP_FAILED && errno == EEXIST)
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tst_res(TPASS, "mmap set errno to EEXIST as expected");
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else
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tst_res(TFAIL | TERRNO, "mmap failed, with unexpected error "
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"code, expected EEXIST");
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.test_all = test_mmap,
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.min_kver = "4.17",
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.needs_tmpdir = 1
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};
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