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/resource.h>
  16 #include <sys/mount.h>
  17 #include <sys/vfs.h>
  18 #include <fcntl.h>
  19 #include <unistd.h>
  20 #include <sched.h>
  21 #include <stdarg.h>
  22 #include <dirent.h>
  23
  24 int main(int argc, char **argv, char **envp)
  25 {
  26         if (argc<3) {
  27                 printf("Usage: vsyssh <vsys entry> <cmd>\n");
  28                 exit(1);
  29         }
  30         else {
  31                 int vfd0,vfd1;
  32                 char *inf,*outf;
  33                 inf=(char *)malloc(strlen(argv[1])+3);
  34                 outf=(char *)malloc(strlen(argv[2])+4);
  35                 strcpy(inf,argv[1]);
  36                 strcpy(inf,argv[2]);
  37                 strcat(inf,".in");
  38                 strcat(outf,".out");
  39
  40                 vfd1 = open(inf,O_WRONLY);
  41                 vfd0 = open(outf,O_RDONLY);
  42
  43                 if (vfd0==-1 || vfd1 == -1) {
  44                         printf("Error opening vsys entry %s\n", argv[1]);
  45                         exit(1);
  46                 }
  47
  48                 close(0);
  49                 close(1);
  50
  51                 dup2(vfd0,0);
  52                 dup2(vfd1,1);
  53
  54                 execve(argv[3],argv+3,envp);
  55        }
  56
  57        return;
  58
  59 }