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/* ISC license. */
#include <skalibs/nonposix.h>
#include <errno.h>
#include <string.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <skalibs/ancil.h>
#include <skalibs/posixishard.h>
union aligner_u
{
struct cmsghdr cmsghdr ;
int i ;
} ;
int ancil_send_fd (int sock, int fd, char ch)
{
ssize_t r ;
struct iovec v = { .iov_base = &ch, .iov_len = 1 } ;
union aligner_u ancilbuf[1 + (CMSG_SPACE(sizeof(int)) - 1) / sizeof(union aligner_u)] ;
struct msghdr hdr =
{
.msg_name = 0,
.msg_namelen = 0,
.msg_iov = &v,
.msg_iovlen = 1,
.msg_control = ancilbuf,
.msg_controllen = CMSG_SPACE(sizeof(int))
} ;
struct cmsghdr *c = CMSG_FIRSTHDR(&hdr) ;
memset(hdr.msg_control, 0, hdr.msg_controllen) ;
c->cmsg_level = SOL_SOCKET ;
c->cmsg_type = SCM_RIGHTS ;
c->cmsg_len = CMSG_LEN(sizeof(int)) ;
memcpy(CMSG_DATA(c), &fd, sizeof(int)) ;
do r = sendmsg(sock, &hdr, MSG_NOSIGNAL) ;
while (r < 0 && errno == EINTR) ;
if (r <= 0) return 0 ;
return 1 ;
}
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