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add test for pread, pwrite

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WangRunji 2019-03-20 20:08:57 +08:00 committed by Tate Tian
parent d5e8d43e7b
commit 0a8e84f4de
1 changed files with 34 additions and 8 deletions
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42
test/file/main.c
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@ -12,6 +12,7 @@ int main(int argc, const char* argv[]) {
const char* write_msg = "Hello World\n"; const char* write_msg = "Hello World\n";
char read_buf[128] = {0}; char read_buf[128] = {0};
// write
flags = O_WRONLY | O_CREAT| O_TRUNC; flags = O_WRONLY | O_CREAT| O_TRUNC;
mode = 00666; mode = 00666;
if ((fd = open(file_name, flags, mode)) < 0) { if ((fd = open(file_name, flags, mode)) < 0) {
@ -24,6 +25,7 @@ int main(int argc, const char* argv[]) {
} }
close(fd); close(fd);
// read
flags = O_RDONLY; flags = O_RDONLY;
if ((fd = open(file_name, flags)) < 0) { if ((fd = open(file_name, flags)) < 0) {
printf("ERROR: failed to open a file for read\n"); printf("ERROR: failed to open a file for read\n");
@ -40,14 +42,14 @@ int main(int argc, const char* argv[]) {
return -1; return -1;
} }
// writev
flags = O_RDWR; flags = O_WRONLY | O_CREAT| O_TRUNC;
if ((fd = open(file_name, flags)) < 0) { if ((fd = open(file_name, flags)) < 0) {
printf("ERROR: failed to open a file for read and write\n"); printf("ERROR: failed to open a file for write\n");
return -1; return -1;
} }
const char* iov_msg[2] = {"hello ", "world!"}; const char* iov_msg[2] = {"hello_", "world!"};
struct iovec iov[2]; struct iovec iov[2];
for(int i=0; i<2; ++i) { for(int i=0; i<2; ++i) {
iov[i].iov_base = (void*)iov_msg[i]; iov[i].iov_base = (void*)iov_msg[i];
@ -58,22 +60,46 @@ int main(int argc, const char* argv[]) {
return -1; return -1;
} }
if ((offset = lseek(fd, 0, SEEK_SET)) != 0) { // pwrite
if ((len = pwrite(fd, " ", 1, 5)) != 1) {
printf("ERROR: failed to pwrite to the file\n");
}
close(fd);
flags = O_RDONLY;
if ((fd = open(file_name, flags)) < 0) {
printf("ERROR: failed to open a file for read\n");
return -1;
}
// lseek
if ((offset = lseek(fd, 2, SEEK_SET)) != 2) {
printf("ERROR: failed to lseek the file\n"); printf("ERROR: failed to lseek the file\n");
return -1; return -1;
} }
// readv
iov[0].iov_base = read_buf; iov[0].iov_base = read_buf;
iov[0].iov_len = 3; iov[0].iov_len = 3;
iov[1].iov_base = read_buf + 5; iov[1].iov_base = read_buf + 5;
iov[1].iov_len = 20; iov[1].iov_len = 20;
if ((len = readv(fd, iov, 2)) != 12) { if ((len = readv(fd, iov, 2)) != 10) {
printf("ERROR: failed to read vectors from the file\n"); printf("ERROR: failed to read vectors from the file\n");
return -1; return -1;
} }
if (memcmp(read_buf, "hel", 3) != 0 if (memcmp(read_buf, "llo", 3) != 0
|| memcmp(read_buf + 5, "lo world!", 9) != 0) { || memcmp(read_buf + 5, " world!", 7) != 0) {
printf("ERROR: the message read from the file is not as it was written\n");
return -1;
}
// pread
if ((len = pread(fd, read_buf, sizeof(read_buf) - 1, 4)) != 8) {
printf("ERROR: failed to pread from the file\n");
}
if (memcmp(read_buf, "o world!", 8) != 0) {
printf("ERROR: the message read from the file is not as it was written\n"); printf("ERROR: the message read from the file is not as it was written\n");
return -1; return -1;
} }