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wasi.c: fix pread/pwrite

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When stream is NULL it means reads should read 0 bytes and writes should
fake success with no side effects.
This commit is contained in:
Andrew Kelley 2025-07-09 10:47:36 -07:00
parent 5c6679922d
commit 5bc95a6fa2
1 changed files with 18 additions and 6 deletions
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24
stage1/wasi.c
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@ -520,12 +520,15 @@ uint32_t wasi_snapshot_preview1_fd_read(uint32_t fd, uint32_t iovs, uint32_t iov
default: panic("unimplemented: fd_read special file");
}
if (fds[fd].stream == NULL) {
store32_align2(res_size_ptr, 0);
return wasi_errno_success;
}
size_t size = 0;
for (uint32_t i = 0; i < iovs_len; i += 1) {
uint32_t len = load32_align2(&iovs_ptr[i].len);
size_t read_size = 0;
if (fds[fd].stream != NULL)
read_size = fread(&m[load32_align2(&iovs_ptr[i].ptr)], 1, len, fds[fd].stream);
size_t read_size = fread(&m[load32_align2(&iovs_ptr[i].ptr)], 1, len, fds[fd].stream);
size += read_size;
if (read_size < len) break;
}
@ -633,8 +636,10 @@ uint32_t wasi_snapshot_preview1_fd_pwrite(uint32_t fd, uint32_t iovs, uint32_t i
}
fpos_t pos;
if (fgetpos(fds[fd].stream, &pos) < 0) return wasi_errno_io;
if (fseek(fds[fd].stream, offset, SEEK_SET) < 0) return wasi_errno_io;
if (fds[fd].stream != NULL) {
if (fgetpos(fds[fd].stream, &pos) < 0) return wasi_errno_io;
if (fseek(fds[fd].stream, offset, SEEK_SET) < 0) return wasi_errno_io;
}
size_t size = 0;
for (uint32_t i = 0; i < iovs_len; i += 1) {
@ -648,7 +653,9 @@ uint32_t wasi_snapshot_preview1_fd_pwrite(uint32_t fd, uint32_t iovs, uint32_t i
if (written_size < len) break;
}
if (fsetpos(fds[fd].stream, &pos) < 0) return wasi_errno_io;
if (fds[fd].stream != NULL) {
if (fsetpos(fds[fd].stream, &pos) < 0) return wasi_errno_io;
}
if (size > 0) {
time_t now = time(NULL);
@ -964,6 +971,11 @@ uint32_t wasi_snapshot_preview1_fd_pread(uint32_t fd, uint32_t iovs, uint32_t io
default: panic("unimplemented: fd_pread special file");
}
if (fds[fd].stream == NULL) {
store32_align2(res_size_ptr, 0);
return wasi_errno_success;
}
fpos_t pos;
if (fgetpos(fds[fd].stream, &pos) < 0) return wasi_errno_io;
if (fseek(fds[fd].stream, offset, SEEK_SET) < 0) return wasi_errno_io;