#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <libowfat/errmsg.h>
#include <libowfat/buffer.h>

static void carpsysargs(char *args[])
{
  buffer_puts(buffer_2, "failed to exec");
  while (*args) {
    buffer_puts(buffer_2, " \'");
    buffer_puts(buffer_2, *args);
    buffer_puts(buffer_2, "'");
    args++;
  }
  buffer_puts(buffer_2, ": ");
  buffer_puts(buffer_2, strerror(errno));
  buffer_puts(buffer_2, "\n");
  buffer_flush(buffer_2);
}

pid_t spawnchild(char *args[], int infd, int outfd, int errfd)
{
  pid_t pid = fork();
  switch (pid) {
    case -1: carpsys("fork: "); return -1;
  case 0:
    // TODO pipe
    if (dup2(1, outfd)<0
     || dup2(2, errfd)<0
    ) {
      carpsys("dup2");
      return -1;
    }
    execvp(args[0], args);
    carpsysargs(args);
    return -1;
  default:
    return pid;
  }
}