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Move CMSG functions to C macros

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This commit is contained in:
Jeremy Soller
2025-05-03 11:21:27 -06:00
parent a1db57a5a3
commit bce8eac3c7
2 changed files with 19 additions and 66 deletions
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include/bits/sys/socket.h
+16
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@@ -13,4 +13,20 @@ struct ucred {
gid_t gid;
};
// These definitions were taken from musl, license MIT {
#define __CMSG_LEN(cmsg) (((cmsg)->cmsg_len + sizeof(long) - 1) & ~(long)(sizeof(long) - 1))
#define __CMSG_NEXT(cmsg) ((unsigned char *)(cmsg) + __CMSG_LEN(cmsg))
#define __MHDR_END(mhdr) ((unsigned char *)(mhdr)->msg_control + (mhdr)->msg_controllen)
#define CMSG_DATA(cmsg) ((unsigned char *) (((struct cmsghdr *)(cmsg)) + 1))
#define CMSG_NXTHDR(mhdr, cmsg) ((cmsg)->cmsg_len < sizeof (struct cmsghdr) || \
__CMSG_LEN(cmsg) + sizeof(struct cmsghdr) >= __MHDR_END(mhdr) - (unsigned char *)(cmsg) \
? 0 : (struct cmsghdr *)__CMSG_NEXT(cmsg))
#define CMSG_FIRSTHDR(mhdr) ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) 0)
#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) & (size_t) ~(sizeof (size_t) - 1))
#define CMSG_SPACE(len) (CMSG_ALIGN (len) + CMSG_ALIGN (sizeof (struct cmsghdr)))
#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
// } from musl, license MIT
#endif // _BITS_SYS_SOCKET_H