diff options
| author | Lennart Poettering <lennart@poettering.net> | 2020-04-17 11:52:48 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2020-04-23 19:41:15 +0200 |
| commit | 371d72e05b7e2c2b7850cb04d8d4c18be1e60421 (patch) | |
| tree | c6b0f467bca7db6d1c5f2d2262199ca2256a8f01 /src/basic/socket-util.h | |
| parent | dac556fa7ba19846f787e560e7de8958891b6754 (diff) | |
| download | systemd-371d72e05b7e2c2b7850cb04d8d4c18be1e60421.tar.gz | |
socket-util: introduce type-safe, dereferencing wrapper CMSG_FIND_DATA around cmsg_find()
let's take this once step further, and add type-safety to cmsg_find(),
and imply the CMSG_DATA() macro for finding the cmsg payload.
Diffstat (limited to 'src/basic/socket-util.h')
| -rw-r--r-- | src/basic/socket-util.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/basic/socket-util.h b/src/basic/socket-util.h index 95643135df..fba4efef81 100644 --- a/src/basic/socket-util.h +++ b/src/basic/socket-util.h @@ -158,6 +158,14 @@ int flush_accept(int fd); struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length); +/* Type-safe, dereferencing version of cmsg_find() */ +#define CMSG_FIND_DATA(mh, level, type, ctype) \ + ({ \ + struct cmsghdr *_found; \ + _found = cmsg_find(mh, level, type, CMSG_LEN(sizeof(ctype))); \ + (ctype*) (_found ? CMSG_DATA(_found) : NULL); \ + }) + /* * Certain hardware address types (e.g Infiniband) do not fit into sll_addr * (8 bytes) and run over the structure. This macro returns the correct size that |