Beispiellösung

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <afblib/strlist.h>

int main(int argc, char** argv) {
   strlist env = {0};
   const char* cmdname = *argv++; --argc;
   while (argc > 0 && strchr(*argv, '=')) {
      if (!strlist_push(&env, *argv)) {
	 perror(""); exit(1);
      }
      --argc; ++argv;
   }
   if (argc == 0) {
      fprintf(stderr, "Usage: %s param=value ... path arg...\n", cmdname);
      exit(1);
   }
   if (!strlist_push0(&env)) {
      perror(""); exit(1);
   }
   execve(argv[0], argv, env.list);
   perror(argv[0]);
   exit(1);
}