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#include <unistd.h> // execvp, fork
#include <stdio.h> // printf
#include <sys/wait.h> // wait
#include <fcntl.h> // open, O_WRONLY
int main(int argc, char* argv[]) {
if (argc < 2) return 1;
pid_t fpid = fork();
if (fpid == 0) {
int fi = open(argv[argc-2], O_RDONLY);
if (fi < 0) {
perror("open");
return 2;
}
dup2(fi, 0);
close(fi);
int fo = open(argv[argc-1], O_WRONLY | O_TRUNC | O_CREAT, 0755);
if (fo < 0) {
perror("open");
return 3;
}
dup2(fo, 1);
close(fo);
char* args[argc-2];
for (int i = 1; i < argc - 2; i++)
args[i-1] = argv[i];
args[argc-3] = NULL;
execvp(argv[1], args);
}
else {
int status;
wait(&status);
printf("%d %d\n", fpid, status);
}
}
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