source: mainline/uspace/dist/src/c/demos/hello/hello.c

typedef int errno_t;
extern errno_t putchar(char);

#define TERMINATOR '!'

int main(void)
{
        /* Prints "hello" to the standard output. */
        putchar('h');
        putchar('e');
        putchar('l');
        putchar('l');
        putchar('o');
        putchar(TERMINATOR);
        putchar('\n');
        return 0;
}