android - socket(AF_INET, SOCK_DGRAM, 0) Fail return -1 -

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in android m, compiled daemon , driver communication, program has use

struct sockaddr_in addr; char buffer[1024]; mcsocket_t *mcs = (mcsocket_t *)data;  /* initialize socket */ mcs->sock = socket(pf_inet, sock_dgram, 0); if(mcs->sock < 0) {    //loge("%s: error on socket(): %d", __func__, mcs->sock);     loge("%s: error on socket(): %d = %s", __func__, errno, strerror(errno));    goto exitcommandthread; } bzero(&addr, sizeof(addr)); addr.sin_family = af_inet; addr.sin_port = htons(mcs->port); addr.sin_addr.s_addr = inaddr_any;  /* bind address , port */ if (0 != bind(mcs->sock, (struct sockaddr*)&addr, sizeof(addr))) {    loge("%s: error on bind(): %d = %s", __func__, errno, strerror(errno));    running = 0; }

but executed /system/bin/daemon ，socket(pf_inet, sock_dgram, 0); returns mcs->sock=-1，print：error on socket(): 13 = permission denied


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