mdw@git.distorted.org.uk Git - qmail/blob - fd_move.3

   1 .TH fd_move 3
   2 .SH NAME
   3 fd_move \- renumber a descriptor
   4 .SH SYNTAX
   5 .B #include <fd.h>
   6
   7 int \fBfd_move\fP(\fIto\fR,\fIfrom\fR);
   8
   9 int \fIto\fR;
  10 .br
  11 int \fIfrom\fR;
  12 .SH DESCRIPTION
  13 .B fd_move
  14 moves
  15 descriptor
  16 .I from
  17 to descriptor
  18 .IR to .
  19 If
  20 .I to
  21 was already open,
  22 .B fd_move
  23 closes it.
  24 If the move is successful,
  25 .B fd_move
  26 closes
  27 .IR from .
  28 Exception:
  29 if
  30 .I to
  31 and
  32 .I from
  33 are the same number,
  34 .B fd_move
  35 does nothing.
  36
  37 .B fd_move
  38 returns 0 on success, -1 on error.
  39 .SH "SEE ALSO"
  40 dup(2),
  41 fd_copy(3)