Function sysctl

tools/compat/sysctl.c:33–143

#include "ff_ipc.h"

int
sysctl(int *name, unsigned namelen, void *old,
    size_t *oldlenp, const void *new, size_t newlen)
{
    struct ff_msg *msg, *retmsg = NULL;
    char *extra_buf = NULL;
    size_t total_len;

    if (old != NULL && oldlenp == NULL) {
        errno = EINVAL;
        return -1;
    }

    msg = ff_ipc_msg_alloc();
    if (msg == NULL) {
        errno = ENOMEM;
        return -1;
    }

    size_t oldlen = 0;
    if (old && oldlenp) {
        oldlen = *oldlenp;
    }

    total_len = namelen * sizeof(int) + sizeof(size_t) + oldlen + newlen;
    if (total_len > msg->buf_len) {
        extra_buf = rte_malloc(NULL, total_len, 0);
        if (extra_buf == NULL) {
            errno = ENOMEM;
            ff_ipc_msg_free(msg);
            return -1;
        }
        msg->original_buf = msg->buf_addr;
        msg->original_buf_len = msg->buf_len;
        msg->buf_addr = extra_buf;
        msg->buf_len = total_len; 
    }

    char *buf_addr = msg->buf_addr;

    msg->msg_type = FF_SYSCTL;
    msg->sysctl.name = (int *)buf_addr;
    msg->sysctl.namelen = namelen;
    memcpy(msg->sysctl.name, name, namelen * sizeof(int));

    buf_addr += namelen * sizeof(int);

    if (new != NULL && newlen != 0) {
        msg->sysctl.new = buf_addr;
        msg->sysctl.newlen = newlen;
        memcpy(msg->sysctl.new, new, newlen);

        buf_addr += newlen;
    } else {
        msg->sysctl.new = NULL;
        msg->sysctl.newlen = 0;
    }