aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/bsd/ulimit.c
blob: 91d77e926a92dbc2f62b366156afcc337207d381 (plain)
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
/* Copyright (C) 1991, 92, 94, 96, 97, 98, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <stdarg.h>
#include <sysdep.h>
#include <ulimit.h>
#include <unistd.h>
#include <sys/resource.h>

#ifndef	 HAVE_GNU_LD
#define	 _etext	etext
#endif

extern int _etext;

/* Function depends on CMD:
   1 = Return the limit on the size of a file, in units of 512 bytes.
   2 = Set the limit on the size of a file to NEWLIMIT.  Only the
       super-user can increase the limit.
   3 = Return the maximum possible address of the data segment.
   4 = Return the maximum number of files that the calling process
       can open.
   Returns -1 on errors.  */
long int
ulimit (int cmd, ...)
{
  struct rlimit limit;
  va_list va;
  long int result = -1;

  va_start (va, cmd);

  switch (cmd)
    {
    case UL_GETFSIZE:
      /* Get limit on file size.  */
      if (getrlimit (RLIMIT_FSIZE, &limit) == 0)
	/* Convert from bytes to 512 byte units.  */
	result = limit.rlim_cur / 512;
      break;

    case UL_SETFSIZE:
      /* Set limit on file size.  */
      {
	long int newlimit = va_arg (va, long int);

	if ((rlim_t) newlimit > RLIM_INFINITY / 512)
	  {
	    limit.rlim_cur = RLIM_INFINITY;
	    limit.rlim_max = RLIM_INFINITY;
	  }
	else
	  {
	    limit.rlim_cur = newlimit * 512;
	    limit.rlim_max = newlimit * 512;
	  }

	result = setrlimit (RLIMIT_FSIZE, &limit);
      }
      break;

    case __UL_GETMAXBRK:
      /* Get maximum address for `brk'.  */
      if (getrlimit (RLIMIT_DATA, &limit) == 0)
	result = ((long int) &_etext) + limit.rlim_cur;
      break;

    case __UL_GETOPENMAX:
      result = sysconf (_SC_OPEN_MAX);
      break;

    default:
      __set_errno (EINVAL);
    }

  va_end (va);

  return result;
}