libraries/mrw-cxx
1
0
Fork 0
Code Issues Releases Activity

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

Browse Source 
default is again blocking, because it causes less trouble
This commit is contained in:
Marc Wäckerlin
2004-12-18 20:58:19 +00:00
parent 3e684a3419
commit 1386c24c79
1 changed files with 18 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
mrw/unistd.hpp
View File

@@ -9,6 +9,10 @@
@license LGPL, see file <a href="license.html">COPYING</a>
$Log$
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
support for connect_cin
pipe is now non blocking by default
@@ -55,20 +59,30 @@ namespace mrw {
int _fd[2];
int _lastError;
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
/** @param blocking Flag whether the pipe is blocking (default: no) */
Pipe(bool blocking=false) throw(std::bad_exception): _lastError(-1) {
/** @param mode Flag whether the pipe is blocking (default: yes) */
Pipe(BlockingMode mode=blocking) throw(std::bad_exception):
_lastError(-1) {
_fd[0] = -1;
_fd[1] = -1;
if (::pipe(_fd)==-1) {
_lastError=errno;
return;
}
if (!blocking) {
if (mode==non_blocking || mode==block_output) {
int val(fcntl(_fd[0], F_GETFL, 0));
if (fcntl(_fd[0], F_SETFL, (val!=-1?val:0)|O_NONBLOCK) == -1)
_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)
_lastError=errno;
}