vhcall/sample3.c

#include <stddef.h>
#include <stdlib.h>
#include <libvhcall.h>
#include <stdio.h>

int main() {
        int ret=1;
        int64_t symid;
        vhcall_handle handle;
        vhcall_args *ca;
        uint64_t retval = -1;
        uint64_t data = 0xdeadbeefbaadcafe;

        handle = vhcall_install("./libdatatransfer.so");
        if (handle == (vhcall_handle)-1) {
                perror("vhcall_install");
                goto ret;
        }

        symid  = vhcall_find(handle, "func");
        if (symid == -1 ) {
                perror("vhcall_find");
                goto ret2;
        }
        /* Allocate arguments object for VH library function */
        ca  = vhcall_args_alloc();
        if (!ca) {
                perror("vhcall_args_alloc");
                goto ret2;
        }
        /* Set each arguments */
        printf("[VE] addr:%p, data:%lx\n", &data, data);
        /* 1st */
        ret = vhcall_args_set_veoshandle(ca, 0);
        if (ret) {
                perror("vhcall_args_set_veoshandle");
                goto ret3;
        }
        /* 2nd */
        ret = vhcall_args_set_u64(ca, 1, (uint64_t)&data);
        if (ret) {
                perror("vhcall_args_set_u64");
                goto ret3;
        }
        /* Invoke VH library function */
        ret = vhcall_invoke_with_args(symid, ca, &retval);
        if (ret) {
                perror("vhcall_invoke_with_args");
                goto ret3;
        }
        if (retval) {
                printf("VH function returns unexpected value(%ld)\n", retval);
                goto ret3;
        }
        printf("[VE] addr:%p, data:%lx\n", &data, data);
        ret = 0;
ret3:
        vhcall_args_free(ca);
ret2:
        if (vhcall_uninstall(handle))
                perror("vhcall_uninstall");
ret:
        return ret;
}