none/tests/freebsd/fexecve.c

   1 #include <fcntl.h> // open
   2 #include <stdio.h> // perror
   3 #include <unistd.h> // getopt
   4 #include <stdlib.h> // exit
   5
   6 int main(int argc, char **argv, char** envp)
   7 {
   8    char *exe = "./hello_world";
   9    int open_flags = 0;
  10    int opt;
  11
  12    while ((opt = getopt(argc, argv, "erst")) != -1)
  13    {
  14       switch (opt)
  15       {
  16          case 'e':
  17             open_flags |= O_EXEC;
  18             break;
  19          case 'r':
  20             open_flags |= O_RDONLY;
  21             break;
  22          case 's':
  23             exe = "./test.sh";
  24             break;
  25          case 't':
  26             exe = "./fexecve.c";
  27             break;
  28          default:
  29             fprintf(stderr, "bad usage, options are\n"
  30                             "\texec flag\t-e\n"
  31                             "\trdonly flag\t-r\n"
  32                             "\texec script\t-s\n"
  33                             "\ntext file\n-t");
  34             exit(-1);
  35       }
  36    }
  37
  38    int fd = open(exe, open_flags);
  39    if (-1 == fd)
  40    {
  41       perror("open failed:");
  42       exit(-1);
  43    }
  44    char *new_argv[] = {
  45       exe,
  46       NULL
  47    };
  48    if (-1 == fexecve(fd, new_argv, envp))
  49    {
  50       perror("fexecv failed:");
  51       exit(-1);
  52    }
  53 }