47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
// SPDX-License-Identifier: MPL-2.0
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/fcntl.h>
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#include "../test.h"
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#define PAGE_SIZE 4096
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FN_TEST(short_rw)
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{
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int fd;
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char *buf;
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fd = TEST_SUCC(open("/dev/random", O_RDONLY));
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buf = TEST_SUCC(mmap(NULL, PAGE_SIZE * 3, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0));
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TEST_SUCC(munmap(buf + PAGE_SIZE * 2, PAGE_SIZE));
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// Invalid address
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TEST_ERRNO(read(fd, buf + PAGE_SIZE * 2, PAGE_SIZE), EFAULT);
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TEST_RES(read(fd, buf + PAGE_SIZE * 2, 0), _ret == 0);
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// Valid address, insufficient space
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - 1, PAGE_SIZE), _ret == 1);
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - (PAGE_SIZE - 1), PAGE_SIZE + 2),
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_ret == (PAGE_SIZE - 1));
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - PAGE_SIZE, PAGE_SIZE + 2),
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_ret == PAGE_SIZE);
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - (PAGE_SIZE + 1), PAGE_SIZE + 2),
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_ret == (PAGE_SIZE + 1));
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// Valid address, sufficient space
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - 1, 1), _ret == 1);
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - (PAGE_SIZE - 1), PAGE_SIZE - 2),
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_ret == (PAGE_SIZE - 2));
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - PAGE_SIZE, PAGE_SIZE - 1),
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_ret == (PAGE_SIZE - 1));
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TEST_RES(read(fd, buf + PAGE_SIZE * 2 - (PAGE_SIZE + 1), PAGE_SIZE),
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_ret == PAGE_SIZE);
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TEST_SUCC(munmap(buf, PAGE_SIZE * 2));
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TEST_SUCC(close(fd));
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}
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END_TEST()
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