external/ibm-public/postfix/dist/src/util/stream_send_fd.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      stream_send_fd 3
   6 /* SUMMARY
   7 /*      send file descriptor
   8 /* SYNOPSIS
   9 /*      #include <iostuff.h>
  10 /*
  11 /*      int     stream_send_fd(fd, sendfd)
  12 /*      int     fd;
  13 /*      int     sendfd;
  14 /* DESCRIPTION
  15 /*      stream_send_fd() sends a file descriptor over the specified
  16 /*      stream.
  17 /*
  18 /*      Arguments:
  19 /* .IP fd
  20 /*      File descriptor.
  21 /* .IP sendfd
  22 /*      Another file descriptor.
  23 /* DIAGNOSTICS
  24 /*      stream_send_fd() returns -1 upon failure.
  25 /* LICENSE
  26 /* .ad
  27 /* .fi
  28 /*      The Secure Mailer license must be distributed with this software.
  29 /* AUTHOR(S)
  30 /*      Wietse Venema
  31 /*      IBM T.J. Watson Research
  32 /*      P.O. Box 704
  33 /*      Yorktown Heights, NY 10598, USA
  34 /*--*/
  35
  36 /* System library. */
  37
  38 #include <sys_defs.h>                   /* includes <sys/types.h> */
  39
  40 #ifdef STREAM_CONNECTIONS
  41
  42 #include <sys/stat.h>
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45 #include <errno.h>
  46 #include <stropts.h>
  47
  48 #endif
  49
  50 /* Utility library. */
  51
  52 #include <msg.h>
  53 #include <iostuff.h>
  54
  55 /* stream_send_fd - send file descriptor */
  56
  57 int     stream_send_fd(int fd, int sendfd)
  58 {
  59 #ifdef STREAM_CONNECTIONS
  60     const char *myname = "stream_send_fd";
  61
  62     if (ioctl(fd, I_SENDFD, sendfd) < 0)
  63         msg_fatal("%s: send file descriptor %d: %m", myname, sendfd);
  64     return (0);
  65 #else
  66             msg_fatal("stream connections are not implemented");
  67 #endif
  68 }
  69
  70 #ifdef TEST
  71
  72  /*
  73   * Proof-of-concept program. Open a file and send the descriptor, presumably
  74   * to the stream_recv_fd test program.
  75   */
  76 #include <unistd.h>
  77 #include <fcntl.h>
  78 #include <string.h>
  79 #include <stdlib.h>
  80 #include <split_at.h>
  81 #include <connect.h>
  82
  83 int     main(int argc, char **argv)
  84 {
  85     char   *transport;
  86     char   *endpoint;
  87     char   *path;
  88     int     server_sock;
  89     int     client_fd;
  90
  91     if (argc < 3
  92         || (endpoint = split_at(transport = argv[1], ':')) == 0
  93         || *endpoint == 0 || *transport == 0)
  94         msg_fatal("usage: %s transport:endpoint file...", argv[0]);
  95
  96     if (strcmp(transport, "stream") == 0) {
  97         server_sock = stream_connect(endpoint, BLOCKING, 0);
  98     } else {
  99         msg_fatal("invalid transport name: %s", transport);
 100     }
 101     if (server_sock < 0)
 102         msg_fatal("connect %s:%s: %m", transport, endpoint);
 103
 104     argv += 2;
 105     while ((path = *argv++) != 0) {
 106         if ((client_fd = open(path, O_RDONLY, 0)) < 0)
 107             msg_fatal("open %s: %m", path);
 108         msg_info("path=%s client_fd=%d", path, client_fd);
 109         if (stream_send_fd(server_sock, client_fd) < 0)
 110             msg_fatal("send file descriptor: %m");
 111         if (close(client_fd) != 0)
 112             msg_fatal("close(%d): %m", client_fd);
 113     }
 114     exit(0);
 115 }
 116
 117 #endif