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                 inf=(char *)malloc(strlen(argv[1])+3);
  35                 outf=(char *)malloc(strlen(argv[2])+4);
  36                 strcpy(inf,argv[1]);
  37                 strcpy(inf,argv[2]);
  38                 strcat(inf,".in");
  39                 strcat(outf,".out");
  40
  41                 vfd1 = open(inf,O_WRONLY);
  42                 vfd0 = open(outf,O_RDONLY);
  43
  44                 if (vfd0==-1 || vfd1 == -1) {
  45                         printf("Error opening vsys entry %s\n", argv[1]);
  46                         exit(1);
  47                 }
  48
  49
  50                 if (argc<3) {
  51                         fd_set set;
  52                         FD_ZERO(&set);
  53                         FD_SET(0,&set);
  54                         FD_SET(vfd0,&set);
  55                         while (1) {
  56                                 int ret;
  57                                 ret = select(2, &set, NULL, NULL, NULL);
  58                                 if (FD_ISSET(0,&set)) {
  59                                         char lineread[2048];
  60                                         int ret;
  61                                         ret=read(0,lineread,2048);
  62                                         write(vfd1,lineread,ret);
  63                                         FD_CLR(0,&set);
  64                                 }
  65                                 else if (FD_ISSET(vfd0,&set)) {
  66                                         char lineread[2048];
  67                                         int ret;
  68                                         ret=read(vfd0,lineread,2048);
  69                                         write(1,lineread,ret);
  70                                         FD_CLR(vfd0,&set);
  71                                 }
  72                         }
  73
  74                 }
  75                 else {
  76                         close(0);
  77                         close(1);
  78
  79                         dup2(vfd0,0);
  80                         dup2(vfd1,1);
  81                         execve(argv[3],argv+3,envp);
  82                 }
  83        }
  84
  85        return;
  86
  87 }