1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* This file is part of GNU Pies
Copyright (C) 2015-2020 Sergey Poznyakoff
GNU Pies is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Pies 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Pies. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include "libpies.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 = 0; i < n; i++)
{
if (fdinfo_buf[i].proc_fd >= minfd)
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 = getmaxfd ();
for (i = minfd; i < n; i++)
close (i);
return 0;
}
void
pies_close_fds (int minfd)
{
if (close_fds_sys (minfd))
close_fds_bruteforce (minfd);
}
|
