pipes can be blocking, non blocking or blocking on one side only

default is again blocking, because it causes less trouble
master
Marc Wäckerlin 20 years ago
parent 3e684a3419
commit 1386c24c79
  1. 22
      mrw/unistd.hpp

@ -9,6 +9,10 @@
@license LGPL, see file <a href="license.html">COPYING</a> @license LGPL, see file <a href="license.html">COPYING</a>
$Log$ $Log$
Revision 1.7 2004/12/18 20:58:19 marc
pipes can be blocking, non blocking or blocking on one side only
default is again blocking, because it causes less trouble
Revision 1.6 2004/12/14 20:32:10 marc Revision 1.6 2004/12/14 20:32:10 marc
support for connect_cin support for connect_cin
pipe is now non blocking by default pipe is now non blocking by default
@ -55,20 +59,30 @@ namespace mrw {
int _fd[2]; int _fd[2];
int _lastError; int _lastError;
public: public:
/// blocking mode
enum BlockingMode {
non_blocking, ///< both sides are non blocking
block_input, ///< pipe input is blocking
block_output, ///< pipe output is blocking
blocking ///< both sides are blocking
};
/// creates a unix pipe /// creates a unix pipe
/** @param blocking Flag whether the pipe is blocking (default: no) */ /** @param mode Flag whether the pipe is blocking (default: yes) */
Pipe(bool blocking=false) throw(std::bad_exception): _lastError(-1) { Pipe(BlockingMode mode=blocking) throw(std::bad_exception):
_lastError(-1) {
_fd[0] = -1; _fd[0] = -1;
_fd[1] = -1; _fd[1] = -1;
if (::pipe(_fd)==-1) { if (::pipe(_fd)==-1) {
_lastError=errno; _lastError=errno;
return; return;
} }
if (!blocking) { if (mode==non_blocking || mode==block_output) {
int val(fcntl(_fd[0], F_GETFL, 0)); int val(fcntl(_fd[0], F_GETFL, 0));
if (fcntl(_fd[0], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1) if (fcntl(_fd[0], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1)
_lastError=errno; _lastError=errno;
val = fcntl(_fd[1], F_GETFL, 0); }
if (mode==non_blocking || mode==block_input) {
int val(fcntl(_fd[1], F_GETFL, 0));
if (fcntl(_fd[1], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1) if (fcntl(_fd[1], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1)
_lastError=errno; _lastError=errno;
} }

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