SymbX/systemd
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

socket-util: add CMSG_TYPED_DATA() as type-safe wrapper around CMSG_DATA()

Browse Source
This commit is contained in:
Lennart Poettering
2022-12-08 17:48:34 +01:00
parent 86bdf11714
commit b6256af75e
1 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/basic/socket-util.h
+8 -6
View File
@@ -175,15 +175,17 @@ int flush_accept(int fd);
#define CMSG_FOREACH(cmsg, mh) \
for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))
#define CMSG_TYPED_DATA(cmsg, type) \
({ \
struct cmsghdr *_cmsg = cmsg; \
_cmsg ? CAST_ALIGN_PTR(type, CMSG_DATA(_cmsg)) : (type*) NULL; \
})
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); \
})
#define CMSG_FIND_DATA(mh, level, type, ctype) \
CMSG_TYPED_DATA(cmsg_find(mh, level, type, CMSG_LEN(sizeof(ctype))), ctype)
/* Resolves to a type that can carry cmsghdr structures. Make sure things are properly aligned, i.e. the type
* itself is placed properly in memory and the size is also aligned to what's appropriate for "cmsghdr"