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Added CMSG macros to /sys/socket.h (#605)

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Vinogradov Daniil 2023-04-02 17:43:42 +02:00 committed by GitHub
parent ab2c2fb256
commit 4c0991dd88
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1 changed files with 29 additions and 2 deletions
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31
nx/external/bsd/include/sys/socket.h vendored
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@ -437,8 +437,35 @@ struct cmsghdr {
/* followed by u_char cmsg_data[]; */
};
// socket credential stuff, we don't need this
// cmsg macros, uses some obscure macro
#define _ALIGNBYTES (sizeof(long) - 1)
#define _ALIGN(p) (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
/* given pointer to struct cmsghdr, return pointer to data */
#define CMSG_DATA(cmsg) \
((unsigned char *)(cmsg) + _ALIGN(sizeof(struct cmsghdr)))
/* given pointer to struct cmsghdr, return pointer to next cmsghdr */
#define CMSG_NXTHDR(mhdr, cmsg) \
(((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
_ALIGN(sizeof(struct cmsghdr)) > \
((char *)(mhdr)->msg_control) + (mhdr)->msg_controllen) ? \
(struct cmsghdr *)NULL : \
(struct cmsghdr *)((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len)))
/*
* RFC 2292 requires to check msg_controllen, in case that the kernel returns
* an empty list for some reasons.
*/
#define CMSG_FIRSTHDR(mhdr) \
((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
(struct cmsghdr *)(mhdr)->msg_control : \
(struct cmsghdr *)NULL)
/* Length of the contents of a control message of length len */
#define CMSG_LEN(len) (_ALIGN(sizeof(struct cmsghdr)) + (len))
/* Length of the space taken up by a padded control message of length len */
#define CMSG_SPACE(len) (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(len))
/* "Socket"-level control message types: */
#define SCM_RIGHTS 0x01 /* access rights (array of int) */