Skip to content

Latest commit

 

History

History

04

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
Makefile
Makefile
 
 
README.md
README.md
 
 
index.html
index.html
 
 
index.js
index.js
 
 
main.c
main.c
 
 

README.md

Example 4: C with Standard Library: printf("Hello World!\n")

Compared to previous examples, we need to add -lc (libc) to the linker flags. The WebAssembly build now depends on imports like fd_close, fd_write, etc., which are equivalent to operating system calls. Such a System Interface API for WebAssembly programs will have to be supplied in the WebAssembly runtime environment, e.g. WASI.

The JavaScript library @wasmer/wasi provides such a WASI implementation. stdout is implemented as a file, just like on Unix, and @wasmer/wasmfs is a suitable implementation in JavaScript.

The WebAssembly build grows to about 4 kB.