1/* $OpenBSD: monitor_fdpass.c,v 1.19 2010/01/12 00:58:25 djm Exp $ */
2/*
3 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright

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29#include <sys/types.h>
30#include <sys/socket.h>
31#include <sys/uio.h>
32#ifdef HAVE_SYS_UN_H
33#include <sys/un.h>
34#endif
35
36#include <errno.h>
37#ifdef HAVE_POLL_H
38#include <poll.h>
39#endif
40#include <string.h>
41#include <stdarg.h>
42
43#include "log.h"
44#include "monitor_fdpass.h"
45
46int
47mm_send_fd(int sock, int fd)

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53 struct cmsghdr hdr;
54 char buf[CMSG_SPACE(sizeof(int))];
55 } cmsgbuf;
56 struct cmsghdr *cmsg;
57#endif
58 struct iovec vec;
59 char ch = '\0';
60 ssize_t n;
61 struct pollfd pfd;
62
63 memset(&msg, 0, sizeof(msg));
64#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
65 msg.msg_accrights = (caddr_t)&fd;
66 msg.msg_accrightslen = sizeof(fd);
67#else
68 msg.msg_control = (caddr_t)&cmsgbuf.buf;
69 msg.msg_controllen = sizeof(cmsgbuf.buf);

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74 *(int *)CMSG_DATA(cmsg) = fd;
75#endif
76
77 vec.iov_base = &ch;
78 vec.iov_len = 1;
79 msg.msg_iov = &vec;
80 msg.msg_iovlen = 1;
81
82 pfd.fd = sock;
83 pfd.events = POLLOUT;
84 while ((n = sendmsg(sock, &msg, 0)) == -1 &&
85 (errno == EAGAIN || errno == EINTR)) {
86 debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
87 (void)poll(&pfd, 1, -1);
88 }
89 if (n == -1) {
90 error("%s: sendmsg(%d): %s", __func__, fd,
91 strerror(errno));
92 return -1;
93 }
94
95 if (n != 1) {
96 error("%s: sendmsg: expected sent 1 got %ld",

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115 char buf[CMSG_SPACE(sizeof(int))];
116 } cmsgbuf;
117 struct cmsghdr *cmsg;
118#endif
119 struct iovec vec;
120 ssize_t n;
121 char ch;
122 int fd;
123 struct pollfd pfd;
124
125 memset(&msg, 0, sizeof(msg));
126 vec.iov_base = &ch;
127 vec.iov_len = 1;
128 msg.msg_iov = &vec;
129 msg.msg_iovlen = 1;
130#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
131 msg.msg_accrights = (caddr_t)&fd;
132 msg.msg_accrightslen = sizeof(fd);
133#else
134 msg.msg_control = &cmsgbuf.buf;
135 msg.msg_controllen = sizeof(cmsgbuf.buf);
136#endif
137
138 pfd.fd = sock;
139 pfd.events = POLLIN;
140 while ((n = recvmsg(sock, &msg, 0)) == -1 &&
141 (errno == EAGAIN || errno == EINTR)) {
142 debug3("%s: recvmsg: %s", __func__, strerror(errno));
143 (void)poll(&pfd, 1, -1);
144 }
145 if (n == -1) {
146 error("%s: recvmsg: %s", __func__, strerror(errno));
147 return -1;
148 }
149
150 if (n != 1) {
151 error("%s: recvmsg: expected received 1 got %ld",
152 __func__, (long)n);

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