xio-fdnum.c

   1 /* source: xio-fdnum.c */
   2 /* Copyright Gerhard Rieger and contributors (see file CHANGES) */
   3 /* Published under the GNU General Public License V.2, see file COPYING */
   4
   5 /* this file contains the source for opening addresses of fdnum type */
   6
   7 #include "xiosysincludes.h"
   8 #include "xioopen.h"
   9
  10 #include "xio-fdnum.h"
  11
  12
  13 #if WITH_FDNUM
  14
  15 static int xioopen_fdnum(int argc, const char *argv[], struct opt *opts, int rw, xiofile_t *xfd, unsigned groups, int dummy1, int dummy2, int dummy3);
  16
  17
  18 const struct addrdesc addr_fd     = { "fd",     3, xioopen_fdnum, GROUP_FD|GROUP_FIFO|GROUP_CHR|GROUP_BLK|GROUP_FILE|GROUP_SOCKET|GROUP_TERMIOS|GROUP_SOCK_UNIX|GROUP_SOCK_IP|GROUP_IPAPP, 0, 0, 0 HELP(":<num>") };
  19
  20
  21 /* use some file descriptor and apply the options. Set the FD_CLOEXEC flag. */
  22 static int xioopen_fdnum(int argc, const char *argv[], struct opt *opts,
  23                          int xioflags, xiofile_t *xfd, unsigned groups,
  24                          int dummy1, int dummy2, int dummy3) {
  25    char *a1;
  26    int rw = (xioflags&XIO_ACCMODE);
  27    int numfd;
  28    int result;
  29
  30    if (argc != 2) {
  31       Error3("%s:%s: wrong number of parameters (%d instead of 1)", argv[0], argv[1], argc-1);
  32    }
  33
  34    numfd = strtoul(argv[1], &a1, 0);
  35    if (*a1 != '\0') {
  36       Error1("error in FD number \"%s\"", argv[1]);
  37    }
  38    /* we dont want to see these fds in child processes */
  39    if (Fcntl_l(numfd, F_SETFD, FD_CLOEXEC) < 0) {
  40       Warn2("fcntl(%d, F_SETFD, FD_CLOEXEC): %s", numfd, strerror(errno));
  41    }
  42    Notice2("using file descriptor %d for %s", numfd, ddirection[rw]);
  43    if ((result = xioopen_fd(opts, rw, &xfd->stream, numfd, dummy2, dummy3)) < 0) {
  44       return result;
  45    }
  46    return 0;
  47 }
  48
  49 #endif /* WITH_FDNUM */
  50
  51 #if WITH_FD
  52
  53 /* retrieve and apply options to a standard file descriptor.
  54    Do not set FD_CLOEXEC flag. */
  55 int xioopen_fd(struct opt *opts, int rw, xiosingle_t *xfd, int numfd, int dummy2, int dummy3) {
  56
  57    xfd->fd = numfd;
  58    xfd->howtoend = END_NONE;
  59
  60 #if WITH_TERMIOS
  61    if (Isatty(xfd->fd)) {
  62       if (Tcgetattr(xfd->fd, &xfd->savetty) < 0) {
  63          Warn2("cannot query current terminal settings on fd %d: %s",
  64                xfd->fd, strerror(errno));
  65       } else {
  66          xfd->ttyvalid = true;
  67       }
  68    }
  69 #endif /* WITH_TERMIOS */
  70    if (applyopts_single(xfd, opts, PH_INIT) < 0)  return -1;
  71    applyopts(-1, opts, PH_INIT);
  72
  73    applyopts2(xfd->fd, opts, PH_INIT, PH_FD);
  74
  75    return _xio_openlate(xfd, opts);
  76 }
  77
  78 #endif /* WITH_FD */