src/basic/rlimit-util.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <sys/resource.h>
  24
  25 #include "missing.h"
  26 #include "rlimit-util.h"
  27 #include "macro.h"
  28 #include "string-table.h"
  29
  30 int setrlimit_closest(int resource, const struct rlimit *rlim) {
  31         struct rlimit highest, fixed;
  32
  33         assert(rlim);
  34
  35         if (setrlimit(resource, rlim) >= 0)
  36                 return 0;
  37
  38         if (errno != EPERM)
  39                 return -errno;
  40
  41         /* So we failed to set the desired setrlimit, then let's try
  42          * to get as close as we can */
  43         assert_se(getrlimit(resource, &highest) == 0);
  44
  45         fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
  46         fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
  47
  48         if (setrlimit(resource, &fixed) < 0)
  49                 return -errno;
  50
  51         return 0;
  52 }
  53
  54 static const char* const rlimit_table[_RLIMIT_MAX] = {
  55         [RLIMIT_CPU] = "LimitCPU",
  56         [RLIMIT_FSIZE] = "LimitFSIZE",
  57         [RLIMIT_DATA] = "LimitDATA",
  58         [RLIMIT_STACK] = "LimitSTACK",
  59         [RLIMIT_CORE] = "LimitCORE",
  60         [RLIMIT_RSS] = "LimitRSS",
  61         [RLIMIT_NOFILE] = "LimitNOFILE",
  62         [RLIMIT_AS] = "LimitAS",
  63         [RLIMIT_NPROC] = "LimitNPROC",
  64         [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
  65         [RLIMIT_LOCKS] = "LimitLOCKS",
  66         [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
  67         [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
  68         [RLIMIT_NICE] = "LimitNICE",
  69         [RLIMIT_RTPRIO] = "LimitRTPRIO",
  70         [RLIMIT_RTTIME] = "LimitRTTIME"
  71 };
  72
  73 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);