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util: extract the request sending code from virNetlinkCommand()

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Allow to reuse as much as possible from virNetlinkCommand(). This
comment prepares for the introduction of virNetlinkDumpCommand()
only differing by how it handles the responses.
This commit is contained in:
Cédric Bosdonnat 2017-03-03 12:16:32 +01:00
parent 9b14b2bc3b
commit d68cb4f554
1 changed files with 68 additions and 49 deletions
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117
src/util/virnetlink.c
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@ -209,6 +209,72 @@ virNetlinkCreateSocket(int protocol)
goto cleanup;
}
static virNetlinkHandle *
virNetlinkSendRequest(struct nl_msg *nl_msg, uint32_t src_pid,
struct sockaddr_nl nladdr,
unsigned int protocol, unsigned int groups)
{
ssize_t nbytes;
int fd;
int n;
virNetlinkHandle *nlhandle = NULL;
struct pollfd fds[1];
struct nlmsghdr *nlmsg = nlmsg_hdr(nl_msg);
if (protocol >= MAX_LINKS) {
virReportSystemError(EINVAL,
_("invalid protocol argument: %d"), protocol);
goto error;
}
if (!(nlhandle = virNetlinkCreateSocket(protocol)))
goto error;
fd = nl_socket_get_fd(nlhandle);
if (fd < 0) {
virReportSystemError(errno,
"%s", _("cannot get netlink socket fd"));
goto error;
}
if (groups && nl_socket_add_membership(nlhandle, groups) < 0) {
virReportSystemError(errno,
"%s", _("cannot add netlink membership"));
goto error;
}
nlmsg_set_dst(nl_msg, &nladdr);
nlmsg->nlmsg_pid = src_pid ? src_pid : getpid();
nbytes = nl_send_auto_complete(nlhandle, nl_msg);
if (nbytes < 0) {
virReportSystemError(errno,
"%s", _("cannot send to netlink socket"));
goto error;
}
memset(fds, 0, sizeof(fds));
fds[0].fd = fd;
fds[0].events = POLLIN;
n = poll(fds, ARRAY_CARDINALITY(fds), NETLINK_ACK_TIMEOUT_S);
if (n <= 0) {
if (n < 0)
virReportSystemError(errno, "%s",
_("error in poll call"));
if (n == 0)
virReportSystemError(ETIMEDOUT, "%s",
_("no valid netlink response was received"));
}
return nlhandle;
error:
virNetlinkFree(nlhandle);
return NULL;
}
/**
* virNetlinkCommand:
@ -236,61 +302,15 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
.nl_pid = dst_pid,
.nl_groups = 0,
};
ssize_t nbytes;
struct pollfd fds[1];
int fd;
int n;
struct nlmsghdr *nlmsg = nlmsg_hdr(nl_msg);
virNetlinkHandle *nlhandle = NULL;
int len = 0;
if (protocol >= MAX_LINKS) {
virReportSystemError(EINVAL,
_("invalid protocol argument: %d"), protocol);
goto cleanup;
}
if (!(nlhandle = virNetlinkCreateSocket(protocol)))
goto cleanup;
fd = nl_socket_get_fd(nlhandle);
if (fd < 0) {
virReportSystemError(errno,
"%s", _("cannot get netlink socket fd"));
goto cleanup;
}
if (groups && nl_socket_add_membership(nlhandle, groups) < 0) {
virReportSystemError(errno,
"%s", _("cannot add netlink membership"));
goto cleanup;
}
nlmsg_set_dst(nl_msg, &nladdr);
nlmsg->nlmsg_pid = src_pid ? src_pid : getpid();
nbytes = nl_send_auto_complete(nlhandle, nl_msg);
if (nbytes < 0) {
virReportSystemError(errno,
"%s", _("cannot send to netlink socket"));
goto cleanup;
}
memset(fds, 0, sizeof(fds));
fds[0].fd = fd;
fds[0].events = POLLIN;
n = poll(fds, ARRAY_CARDINALITY(fds), NETLINK_ACK_TIMEOUT_S);
if (n <= 0) {
if (n < 0)
virReportSystemError(errno, "%s",
_("error in poll call"));
if (n == 0)
virReportSystemError(ETIMEDOUT, "%s",
_("no valid netlink response was received"));
if (!(nlhandle = virNetlinkSendRequest(nl_msg, src_pid, nladdr,
protocol, groups)))
goto cleanup;
}
len = nl_recv(nlhandle, &nladdr, (unsigned char **)resp, NULL);
if (len == 0) {
@ -315,7 +335,6 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
return ret;
}
/**
* virNetlinkDumpLink:
*