#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/uio.h>
int get_fd(const char *filename, int flags) {
int fd = open(filename, flags);
if (fd == -1) {
printf("Get file descriptor of file %s failed!\n", filename);
return -1;
} else {
printf("Get file descriptor of file %s succeed!\n", filename);
return fd;
}
}
void closebyfd(int fd) {
if (close(fd) == -1) {
printf("Close the file %d by descriptor failed!\n", fd);
}
}
void fd_pwrite_00067_nEEKq(int fd) {
printf("Enter function fd_pwrite_00067_nEEKq\n");
off_t size = lseek(fd, 0, SEEK_END);
printf("Current file size before: %ld\n", size);
struct iovec iov[1];
iov[0].iov_base = "";
iov[0].iov_len = 0;
off_t offset = lseek(fd, 0, SEEK_CUR);
if (offset == -1) {
printf("Failed to get current offset\n");
return;
}
ssize_t bytes_written = pwritev(fd, iov, 1, 9);
if (bytes_written == -1) {
printf("pwritev failed\n");
} else {
printf("pwritev successful. %zd bytes written\n", bytes_written);
}
size = lseek(fd, 0, SEEK_END);
printf("Current file size after: %ld\n", size);
}
int main() {
int fd = get_fd("subdir_2/subdir_1/subdir_2/subdir_3/subfile_3", O_RDONLY);
if (fd == -1) {
return 1;
}
fd_pwrite_00067_nEEKq(fd);
closebyfd(fd);
return 0;
}
Steps to Reproduce
(1)compile to wasm:./wasi-sdk-21.0/bin/clang --target=wasm32-unkown-wasi --sysroot=./wasi-sdk-21.0/share/wasi-sysroot test.c -o test.wasm
(2)Running wasm:
(Before run the Wasm file, file subdir_2/subdir_1/subdir_2/subdir_3/subfile_3 exists.)
wasmtime run --dir=. test.wasm
Expected Results
Print:
Get file descriptor of file subdir_2/subdir_1/subdir_2/subdir_3/subfile_3 succeed!
Enter function fd_pwrite_00067_nEEKq
Current file size before: 87
pwritev failed
Current file size after: 87
This is what WAMR, WasmEdge and Linux native code do.
Actual Results
wasmtime prints:
Get file descriptor of file subdir_2/subdir_1/subdir_2/subdir_3/subfile_3 succeed!
Enter function fd_pwrite_00067_nEEKq
Current file size before: 87
pwritev successful. 0 bytes written
Current file size after: 87
The file is opened with O_RDONLY.
Maybe write successful message is not expected.
Versions and Environment
Wasmtime version or commit: 19.0.2
Operating system: Ubuntu 20.04
Architecture: x86_64
Test Case
The c test case is:
Steps to Reproduce
(1)compile to wasm:
./wasi-sdk-21.0/bin/clang --target=wasm32-unkown-wasi --sysroot=./wasi-sdk-21.0/share/wasi-sysroot test.c -o test.wasm
(2)Running wasm: (Before run the Wasm file, file subdir_2/subdir_1/subdir_2/subdir_3/subfile_3 exists.)
wasmtime run --dir=. test.wasm
Expected Results
Print:
This is what WAMR, WasmEdge and Linux native code do.
Actual Results
wasmtime prints:
The file is opened with O_RDONLY. Maybe write successful message is not expected.
Versions and Environment
Wasmtime version or commit: 19.0.2 Operating system: Ubuntu 20.04 Architecture: x86_64