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test_io: Test that seeking past EOF and then reading returns 0

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This commit is contained in:
Andreas Kling 2020-01-03 04:03:52 +01:00
parent 3be1c7b514
commit bbedad1197
1 changed files with 21 additions and 8 deletions
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29
Userland/test_io.cpp
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@ -5,14 +5,6 @@
#include <sys/mman.h>
#include <unistd.h>
#define EXPECT_OK(syscall, address, size) \
do { \
rc = syscall(fd, (void*)(address)); \
if (rc < 0) { \
fprintf(stderr, "Expected success: " #syscall "(%p, %zu), got rc=%d, errno=%d\n", (void*)(address), (size_t)(size), rc, errno); \
} \
} while (0)
#define EXPECT_ERROR_2(err, syscall, arg1, arg2) \
do { \
rc = syscall(arg1, arg2); \
@ -75,6 +67,26 @@ void test_write_to_readonly()
ASSERT(rc == 0);
}
void test_read_past_eof()
{
char buffer[BUFSIZ];
int fd = open("/home/anon/myfile.txt", O_RDONLY);
if (fd < 0)
perror("open");
ASSERT(fd >= 0);
int rc;
rc = lseek(fd, 9999, SEEK_SET);
if (rc < 0)
perror("lseek");
rc = read(fd, buffer, sizeof(buffer));
if (rc < 0)
perror("read");
if (rc > 0)
fprintf(stderr, "read %d bytes past EOF\n", rc);
rc = close(fd);
ASSERT(rc == 0);
}
int main(int, char**)
{
int rc;
@ -90,6 +102,7 @@ int main(int, char**)
test_write_to_directory();
test_read_from_writeonly();
test_write_to_readonly();
test_read_past_eof();
return 0;
}