FreeCalypso > hg > themwi-rtp-mgr

annotate librtpalloc/recvmsg_wrap.c @ 3:60b512a868b4

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librtpalloc: port of recvmsg wrapper module
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2024 20:41:21 +0000
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60b512a868b4 librtpalloc: port of recvmsg wrapper module
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * Here we implement the collect_rtpmgr_resp() function,
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3 * which is a wrapper around the mess of recvmsg
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4 * with file descriptor passing.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.h>
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9 #include <stdint.h>
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10 #include <string.h>
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11 #include <strings.h>
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12
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13 #include <themwi/rtp/rtp_alloc_if.h>
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14 #include <themwi/rtp/rtp_alloc_resp.h>
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15
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16 int collect_rtpmgr_resp(int ctrl_fd, int recv_flags,
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17 struct rtp_alloc_resp_wrap *out)
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18 {
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19 int rc;
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20 struct iovec iov;
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21 struct msghdr msg;
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22 union {
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23 char buf[CMSG_SPACE(sizeof(int) * 4)];
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24 struct cmsghdr align;
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25 } cmsgu;
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26 struct cmsghdr *cmsg;
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27
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28 iov.iov_base = &out->resp;
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29 iov.iov_len = sizeof(struct rtp_alloc_resp);
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30 bzero(&msg, sizeof msg);
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31 msg.msg_iov = &iov;
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32 msg.msg_iovlen = 1;
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33 msg.msg_control = cmsgu.buf;
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34 msg.msg_controllen = CMSG_SPACE(sizeof(int) * 4);
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35 rc = recvmsg(ctrl_fd, &msg, recv_flags);
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36 if (rc < 0)
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37 return rc;
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38 out->resp_len = rc;
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39 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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40 if (cmsg->cmsg_level == SOL_SOCKET &&
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41 cmsg->cmsg_type == SCM_RIGHTS)
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42 break;
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43 }
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44 if (cmsg) {
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45 switch (cmsg->cmsg_len) {
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46 case CMSG_LEN(sizeof(int)):
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47 out->num_fd = 1;
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48 break;
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49 case CMSG_LEN(sizeof(int) * 2):
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50 out->num_fd = 2;
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51 break;
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52 case CMSG_LEN(sizeof(int) * 3):
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53 out->num_fd = 3;
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54 break;
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55 case CMSG_LEN(sizeof(int) * 4):
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56 out->num_fd = 4;
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57 break;
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58 default:
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59 out->num_fd = 0;
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60 }
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61 if (out->num_fd)
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62 bcopy(CMSG_DATA(cmsg), out->fd_buf,
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63 sizeof(int) * out->num_fd);
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64 } else
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65 out->num_fd = 0;
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66 return 0;
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67 }