Userzxcvbvnm added the bug label to Issue #8819.
Userzxcvbvnm opened issue #8819:
Test Case
The c test case is:
#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_read_00036_Ep05V(int fd) { printf("Enter function fd_read_00036_Ep05V\n"); char buf1[47]; char buf2[47]; struct iovec iov[2]; ssize_t num_read; iov[0].iov_base = buf1; iov[0].iov_len = 47; iov[1].iov_base = buf2; iov[1].iov_len = 47; num_read = readv(fd, iov, 2); if (num_read == -1) { printf("Error reading from file descriptor\n"); } else { printf("Read %ld bytes using readv\n", num_read); } } int main() { int fd = get_fd("subdir_1/subdir_4/subfile_2", O_RDWR); if (fd == -1) { return 1; } fd_read_00036_Ep05V(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_1/subdir_4/subfile_2 exists, and the file size is 84 bytes.)
wasmtime run --dir=. test.wasm
Expected Results
Print:
Get file descriptor of file subdir_1/subdir_4/subfile_2 succeed! Enter function fd_read_00036_Ep05V Read 84 bytes using readv
This is what WAMR and WasmEdge do.
Actual Results
wasmtime prints:
Get file descriptor of file subdir_1/subdir_4/subfile_2 succeed! Enter function fd_read_00036_Ep05V Read 47 bytes using readv
wasmtime only use one buffer although two are given.
Versions and Environment
Wasmtime version or commit: 19.0.2
Operating system: Ubuntu 20.04
Architecture: x86_64
pchickey closed issue #8819:
Test Case
The c test case is:
#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_read_00036_Ep05V(int fd) { printf("Enter function fd_read_00036_Ep05V\n"); char buf1[47]; char buf2[47]; struct iovec iov[2]; ssize_t num_read; iov[0].iov_base = buf1; iov[0].iov_len = 47; iov[1].iov_base = buf2; iov[1].iov_len = 47; num_read = readv(fd, iov, 2); if (num_read == -1) { printf("Error reading from file descriptor\n"); } else { printf("Read %ld bytes using readv\n", num_read); } } int main() { int fd = get_fd("subdir_1/subdir_4/subfile_2", O_RDWR); if (fd == -1) { return 1; } fd_read_00036_Ep05V(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_1/subdir_4/subfile_2 exists, and the file size is 84 bytes.)
wasmtime run --dir=. test.wasm
Expected Results
Print:
Get file descriptor of file subdir_1/subdir_4/subfile_2 succeed! Enter function fd_read_00036_Ep05V Read 84 bytes using readv
This is what WAMR and WasmEdge do.
Actual Results
wasmtime prints:
Get file descriptor of file subdir_1/subdir_4/subfile_2 succeed! Enter function fd_read_00036_Ep05V Read 47 bytes using readv
wasmtime only use one buffer although two are given.
Versions and Environment
Wasmtime version or commit: 19.0.2
Operating system: Ubuntu 20.04
Architecture: x86_64
pchickey commented on issue #8819:
In the vectored read/write calls, using only one the first buffer when two are given is acceptable behavior.
Last updated: Dec 23 2024 at 12:05 UTC