cloexec_from.c

   1 /*
   2  * Copyright (C) 2012-2020 all contributors <cmogstored-public@yhbt.net>
   3  * License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
   4  */
   5 #include "cmogstored.h"
   6
   7 /*
   8  * this function is only called in a vforked child (for iostat)
   9  * if O_CLOEXEC/SOCK_CLOEXEC is unsupported, or if mog_cloexec_detect()
  10  * detects those flags are broken.
  11  */
  12 void mog_cloexec_from(int lowfd) /* vfork-safe */
  13 {
  14         int fd;
  15         int last_good = lowfd;
  16
  17         for (fd = lowfd; fd < INT_MAX; fd++) {
  18                 if (mog_set_cloexec(fd, true) == 0)
  19                         last_good = fd;
  20                 if ((last_good + 1024) < fd)
  21                         break;
  22         }
  23 }