Creepiest bug ever

[vsys.git] / vsyssh / vsyssh.c

diff --git a/vsyssh/vsyssh.c b/vsyssh/vsyssh.c
index b0377ca..586c6a7 100644 (file)
--- a/vsyssh/vsyssh.c
+++ b/vsyssh/vsyssh.c
@@ -12,6 +12,7 @@
 #include <sys/syscall.h>
 #include <sys/wait.h>
 #include <sys/time.h>
+#include <sys/select.h>
 #include <sys/resource.h>
 #include <sys/mount.h>
 #include <sys/vfs.h>
@@ -23,35 +24,72 @@
 
 int main(int argc, char **argv, char **envp)
 {
-       if (argc<3) {
-               printf("Usage: vsyssh <vsys entry> <cmd>\n");
+       if (argc<2) {
+               printf("Usage: vsyssh <vsys entry> [cmd]\n");
                exit(1);
        }
        else {
                int vfd0,vfd1;
                char *inf,*outf;
+               struct timeval tv;
+
                inf=(char *)malloc(strlen(argv[1])+3);
-               outf=(char *)malloc(strlen(argv[2])+4);
+               outf=(char *)malloc(strlen(argv[1])+4);
                strcpy(inf,argv[1]);
-               strcpy(inf,argv[2]);
+               strcpy(outf,argv[1]);
                strcat(inf,".in");
                strcat(outf,".out");
+               tv.tv_sec = 100;
+               tv.tv_usec = 0;
 
-               vfd1 = open(inf,O_WRONLY);
-               vfd0 = open(outf,O_RDONLY);
+               vfd1 = open(inf,O_WRONLY|O_NONBLOCK);
+               vfd0 = open(outf,O_RDONLY|O_NONBLOCK);
 
                if (vfd0==-1 || vfd1 == -1) {
                        printf("Error opening vsys entry %s\n", argv[1]);
                        exit(1);
                }
 
-               close(0);
-               close(1);
+               if (argc<3) {
+                       fd_set set;
+                       FD_ZERO(&set);
+                       FD_SET(0, &set);
+                       FD_SET(vfd0, &set);
+
+                       while (1) {
+                               int ret;
+                               printf("vsys>");fflush(stdout);
+                               ret = select(vfd0+1, &set, NULL, NULL, &tv);
+                               FD_SET(0, &set);
+                               FD_SET(vfd0, &set);
+                               if (FD_ISSET(0,&set)) {
+                                       char lineread[2048];
+                                       int ret;
+                                       printf("Here\n");
+                                       ret=read(0,lineread,2048);
+                                       write(vfd1,lineread,ret);
+                                       FD_CLR(0,&set);
+                               }
+                               if (FD_ISSET(vfd0,&set)) {
+                                       char lineread[2048];
+                                       int ret;
+                                       printf("Here2\n");
+                                       ret=read(vfd0,lineread,2048);
+                                       write(1,lineread,ret);
+                                       printf("Here3\n");
+                                       FD_CLR(vfd0,&set);
+                               }
+                       }
 
-               dup2(vfd0,0);
-               dup2(vfd1,1);
+               }
+               else {
+                       close(0);
+                       close(1);
 
-               execve(argv[3],argv+3,envp);
+                       dup2(vfd0,0);
+                       dup2(vfd1,1);
+                       execve(argv[3],argv+3,envp);
+               }
        }
 
        return;