dup test

test/gmttest.cpp

@@ -3,6 +3,7 @@
 #include <string>
 #include <unistd.h>
 #include <sys/wait.h>
+#include <pthread.h>
 
 int print_func(FILE* fd, const char* str)
 {
@@ -10,57 +11,27 @@ int print_func(FILE* fd, const char* str)
  return 0;
 }
 
-
-int main()
+void* thr(void* p)
 {
- char* text="GMT";
- //void* out;
- void* gmtapi;
- std::string args="-R130/160/40/60 -JM12c -Xa2c -Ya2c -B5/5/swNE --GMT_HISTORY=f --FONT_ANNOT_PRIMARY=14p,Times-Bold,red";
- struct GMT_OPTION* opts;
- int io,ret;
- char fname[16];
- int pipefd[2];
- std::string out;
- char buffer[4096];
- pid_t pid;
-
- gmtapi=GMT_Create_Session(text,2,0,print_func);
- //io=GMT_Register_IO(gmtapi,GMT_IS_TEXTSET,GMT_IS_DUPLICATE,GMT_IS_NONE,GMT_OUT,0,0);
- //GMT_Encode_ID(gmtapi,fname,io);
- opts=GMT_Create_Options(gmtapi,0,(void*)args.c_str());
- //ret=GMT_Init_IO(gmtapi,GMT_IS_TEXTSET,GMT_IS_NONE,GMT_OUT,5,0,opts);
- std::cout<<io<<" "<<GMT_NOTSET<<" "<<fname<<" "<<ret<<std::endl;
-
- pipe(pipefd);
- pid=fork();
- if(0==pid)
- {
-  dup2(pipefd[1],1);
-  GMT_Call_Module(gmtapi,"psbasemap",GMT_MODULE_OPT,opts);
-  exit(0);
- }
- else
- {
-  ssize_t br;
-  std::string s="CALL\n";
-//  write(1,s.c_str(),s.length());
-  close(pipefd[1]);
-  do
-  {
-   br=read(pipefd[0],buffer,4096);
-   std::cout<<out.max_size()<<" "<<out.capacity()<<" "<<out.size()<<std::endl;
-   out.append(buffer,br);
-  } while(0!=br);
-  wait(0);
-  close(pipefd[0]);
- }
+ std::cout<<"Thread Phase1\n";
+ close(1);
+ std::cout<<"Thread Phase2\n";
+ return 0;
+}
 
- out.shrink_to_fit();
- std::cout<<out.max_size()<<" "<<out.capacity()<<" "<<out.size()<<std::endl;
 
- GMT_Destroy_Options(gmtapi,&opts);
- GMT_Destroy_Session(gmtapi);
+int main()
+{
+ int savefd;
+ pthread_t t;
+
+ std::cout<<"Phase1\n";
+ savefd=dup(1);
+ pthread_create(&t,0,&thr,0);
+ pthread_join(t,0);
+ std::cout<<"Phase2\n";
+ dup2(savefd,1);
+ std::cout<<"Phase3\n";
 
  return 0;
 }