vsyssh/vsyssh.c

   1 /* gcc -Wall -O2 -g chpid.c -o chpid */
   2 #define _XOPEN_SOURCE
   3 #define _XOPEN_SOURCE_EXTENDED
   4 #define _SVID_SOURCE
   5 #define _GNU_SOURCE
   6 #include <stdio.h>
   7 #include <errno.h>
   8 #include <string.h>
   9 #include <stdlib.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <sys/syscall.h>
  13 #include <sys/wait.h>
  14 #include <sys/time.h>
  15 #include <sys/select.h>
  16 #include <sys/resource.h>
  17 #include <sys/mount.h>
  18 #include <sys/vfs.h>
  19 #include <fcntl.h>
  20 #include <unistd.h>
  21 #include <sched.h>
  22 #include <stdarg.h>
  23 #include <dirent.h>
  24
  25 int main(int argc, char **argv, char **envp)
  26 {
  27         if (argc<2) {
  28                 printf("Usage: vsyssh <vsys entry> [cmd]\n");
  29                 exit(1);
  30         }
  31         else {
  32                 int vfd0,vfd1;
  33                 char *inf,*outf;
  34                 struct timeval tv;
  35
  36                 inf=(char *)malloc(strlen(argv[1])+3);
  37                 outf=(char *)malloc(strlen(argv[1])+4);
  38                 strcpy(inf,argv[1]);
  39                 strcpy(outf,argv[1]);
  40                 strcat(inf,".in");
  41                 strcat(outf,".out");
  42
  43                 vfd1 = open(inf,O_WRONLY|O_NONBLOCK);
  44                 vfd0 = open(outf,O_RDONLY|O_NONBLOCK);
  45
  46                 if (vfd0==-1 || vfd1 == -1) {
  47                         printf("Error opening vsys entry %s\n", argv[1]);
  48                         exit(1);
  49                 }
  50
  51                 if (argc<3) {
  52                         fd_set set;
  53                         FD_ZERO(&set);
  54                         FD_SET(0, &set);
  55                         FD_SET(vfd0, &set);
  56
  57                         while (1) {
  58                                 int ret;
  59                                 printf("vsys>");fflush(stdout);
  60                                 FD_SET(0, &set);
  61                                 FD_SET(vfd0, &set);
  62                                 ret = select(vfd0+1, &set, NULL, NULL, NULL);
  63                                 if (FD_ISSET(0,&set)) {
  64                                         char lineread[2048];
  65                                         int ret;
  66                                         ret=read(0,lineread,2048);
  67                                         write(vfd1,lineread,ret);
  68                                         FD_CLR(0,&set);
  69                                 } if (FD_ISSET(vfd0,&set)) {
  70                                         char lineread[2048];
  71                                         int ret;
  72                                         ret=read(vfd0,lineread,2048);
  73                                         write(1,lineread,ret);
  74                                         FD_CLR(vfd0,&set);
  75                                 }
  76                         }
  77
  78                 }
  79                 else {
  80                         close(0);
  81                         close(1);
  82
  83                         dup2(vfd0,0);
  84                         dup2(vfd1,1);
  85                         execve(argv[3],argv+3,envp);
  86                 }
  87        }
  88
  89        return;
  90
  91 }