[libvirt] [PATCH v3 04/11] util: netlink: use VIR_AUTOPTR for aggregate types
Sukrit Bhatnagar
skrtbhtngr at gmail.com
Thu Aug 9 04:12:12 UTC 2018
By making use of GNU C's cleanup attribute handled by the
VIR_AUTOPTR macro for declaring aggregate pointer variables,
majority of the calls to *Free functions can be dropped, which
in turn leads to getting rid of most of our cleanup sections.
Signed-off-by: Sukrit Bhatnagar <skrtbhtngr at gmail.com>
---
src/util/virnetlink.c | 72 ++++++++++++++++++++-------------------------------
1 file changed, 28 insertions(+), 44 deletions(-)
diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c
index fcdc09d..66e80e2 100644
--- a/src/util/virnetlink.c
+++ b/src/util/virnetlink.c
@@ -297,15 +297,16 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
uint32_t src_pid, uint32_t dst_pid,
unsigned int protocol, unsigned int groups)
{
- int ret = -1;
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK,
.nl_pid = dst_pid,
.nl_groups = 0,
};
struct pollfd fds[1];
- VIR_AUTOPTR(virNetlinkHandle) nlhandle = NULL;
int len = 0;
+ VIR_AUTOPTR(virNetlinkHandle) nlhandle = NULL;
+
+ *respbuflen = 0;
memset(fds, 0, sizeof(fds));
@@ -324,15 +325,12 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
goto cleanup;
}
- ret = 0;
*respbuflen = len;
- cleanup:
- if (ret < 0) {
- *resp = NULL;
- *respbuflen = 0;
- }
+ return 0;
- return ret;
+ cleanup:
+ *resp = NULL;
+ return -1;
}
int
@@ -409,7 +407,7 @@ virNetlinkDumpLink(const char *ifname, int ifindex,
.ifi_index = ifindex
};
unsigned int recvbuflen;
- struct nl_msg *nl_msg;
+ VIR_AUTOPTR(virNlMsg) nl_msg = NULL;
VIR_AUTOFREE(struct nlmsghdr *) resp = NULL;
*nlData = NULL;
@@ -450,7 +448,7 @@ virNetlinkDumpLink(const char *ifname, int ifindex,
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen,
src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
- goto cleanup;
+ return -1;
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
goto malformed_resp;
@@ -465,7 +463,7 @@ virNetlinkDumpLink(const char *ifname, int ifindex,
virReportSystemError(-err->error,
_("error dumping %s (%d) interface"),
ifname, ifindex);
- goto cleanup;
+ return -1;
}
break;
@@ -482,21 +480,17 @@ virNetlinkDumpLink(const char *ifname, int ifindex,
}
VIR_STEAL_PTR(*nlData, resp);
- rc = 0;
-
- cleanup:
- nlmsg_free(nl_msg);
- return rc;
+ return 0;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
- goto cleanup;
+ return rc;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
- goto cleanup;
+ return rc;
}
@@ -518,11 +512,10 @@ virNetlinkDumpLink(const char *ifname, int ifindex,
int
virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
{
- int rc = -1;
struct nlmsgerr *err;
struct ifinfomsg ifinfo = { .ifi_family = AF_UNSPEC };
unsigned int recvbuflen;
- struct nl_msg *nl_msg;
+ VIR_AUTOPTR(virNlMsg) nl_msg = NULL;
VIR_AUTOFREE(struct nlmsghdr *) resp = NULL;
nl_msg = nlmsg_alloc_simple(RTM_DELLINK,
@@ -540,7 +533,7 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen, 0, 0,
NETLINK_ROUTE, 0) < 0) {
- goto cleanup;
+ return -1;
}
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
@@ -552,15 +545,14 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
if (resp->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
goto malformed_resp;
- if (-err->error == EOPNOTSUPP && fallback) {
- rc = fallback(ifname);
- goto cleanup;
- }
+ if (-err->error == EOPNOTSUPP && fallback)
+ return fallback(ifname);
+
if (err->error) {
virReportSystemError(-err->error,
_("error destroying network device %s"),
ifname);
- goto cleanup;
+ return -1;
}
break;
@@ -571,20 +563,17 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
goto malformed_resp;
}
- rc = 0;
- cleanup:
- nlmsg_free(nl_msg);
- return rc;
+ return 0;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
- goto cleanup;
+ return -1;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
- goto cleanup;
+ return -1;
}
/**
@@ -605,13 +594,12 @@ virNetlinkDelLink(const char *ifname, virNetlinkDelLinkFallback fallback)
int
virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
{
- int rc = -1;
struct nlmsgerr *err;
struct ndmsg ndinfo = {
.ndm_family = AF_UNSPEC,
};
unsigned int recvbuflen;
- struct nl_msg *nl_msg;
+ VIR_AUTOPTR(virNlMsg) nl_msg = NULL;
VIR_AUTOFREE(struct nlmsghdr *) resp = NULL;
*nlData = NULL;
@@ -628,7 +616,7 @@ virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
if (virNetlinkCommand(nl_msg, &resp, &recvbuflen,
src_pid, dst_pid, NETLINK_ROUTE, 0) < 0)
- goto cleanup;
+ return -1;
if (recvbuflen < NLMSG_LENGTH(0) || resp == NULL)
goto malformed_resp;
@@ -642,7 +630,7 @@ virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
if (err->error) {
virReportSystemError(-err->error,
"%s", _("error dumping"));
- goto cleanup;
+ return -1;
}
break;
@@ -654,21 +642,17 @@ virNetlinkGetNeighbor(void **nlData, uint32_t src_pid, uint32_t dst_pid)
}
VIR_STEAL_PTR(*nlData, resp);
- rc = recvbuflen;
-
- cleanup:
- nlmsg_free(nl_msg);
- return rc;
+ return recvbuflen;
malformed_resp:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("malformed netlink response message"));
- goto cleanup;
+ return -1;
buffer_too_small:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("allocated netlink buffer is too small"));
- goto cleanup;
+ return -1;
}
int
--
1.8.3.1
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