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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2019-2020 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <mailutils/util.h>
#if defined (HAVE_FUNC_CLOSEFROM)
# include <unistd.h>
static int
close_fds_sys (int minfd)
{
closefrom (minfd);
return 0;
}
#elif defined (HAVE_FCNTL_CLOSEM)
# include <fcntl.h>
static int
close_fds_sys (int minfd)
{
fcntl (minfd, F_CLOSEM, 0);
return 0;
}
#elif defined (HAVE_LIBPROC_H) && defined (HAVE_FUNC_PROC_PIDINFO)
#include <libproc.h>
static int
close_fds_sys (int minfd)
{
pid_t pid = getpid ();
struct proc_fdinfo *fdinfo;
int i, n, size;
size = proc_pidinfo (pid, PROC_PIDLISTFDS, 0, NULL, 0);
if (size == 0)
return 0;
else if (size < 0)
return -1;
fdinfo = calloc (size, sizeof (fdinfo[0]));
if (!fdinfo)
return -1;
n = proc_pidinfo (pid, PROC_PIDLISTFDS, 0, fdinfo, size);
if (n <= 0)
{
free (fdinfo);
return -1;
}
n /= PROC_PIDLISTFD_SIZE;
for (i = minfd; i < n; i++)
{
close (fdinfo_buf[i].proc_fd);
}
free (fdinfo);
return 0;
}
#elif defined (HAVE_PROC_SELF_FD)
# include <sys/types.h>
# include <dirent.h>
# include <limits.h>
static int
close_fds_sys (int minfd)
{
DIR *dir;
struct dirent *ent;
dir = opendir ("/proc/self/fd");
if (!dir)
return -1;
while ((ent = readdir (dir)) != NULL)
{
long n;
char *p;
if (ent->d_name[0] == '.')
continue;
n = strtol (ent->d_name, &p, 10);
if (n >= minfd && n < INT_MAX && *p == 0)
close ((int) n);
}
closedir (dir);
return 0;
}
#else
# define close_fds_sys(fd) (-1)
#endif
static int
close_fds_bruteforce (int minfd)
{
int i, n = mu_getmaxfd ();
for (i = minfd; i < n; i++)
close (i);
return 0;
}
void
mu_close_fds (int minfd)
{
if (close_fds_sys (minfd))
close_fds_bruteforce (minfd);
}
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