如何在 WASM 中
exec
?它给出错误45
(Operation not supported
)。是否有一些标志来启用exec
? callee.wasm
不是 exec
的正确文件吗?
terminal
> emcc callee.c -o callee.wasm
> emcc caller.c --embed-file callee.wasm -o index.html
> # will be used through index.html, but node is faster for development
> # note: MEMFS working directory is "/" and "/callee.wasm" exists
> # https://emscripten.org/docs/api_reference/Filesystem-API.html
> node index.js
Caller
Caller: 45
caller.c
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
int main() {
printf("Caller\n");
char *args[] = {"./callee.wasm", NULL};
execvp(args[0], args);
printf("Caller: %d\n", errno);
}
callee.c
#include <stdio.h>
int main() {
printf("Success!\n");
}
需要说明的是,这是简化版,所以不建议把
printf("Success!\n");
放在caller.c
里,完全避免exec