openbsd-compat/port-solaris.c

   1 /* $Id: port-solaris.c,v 1.2 2006/09/01 05:38:41 djm Exp $ */
   2
   3 /*
   4  * Copyright (c) 2006 Chad Mynhier.
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "config.h"
  20 #include "includes.h"
  21
  22 #ifdef USE_SOLARIS_PROCESS_CONTRACTS
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/param.h>
  27
  28 #include <errno.h>
  29 #ifdef HAVE_FCNTL_H
  30 # include <fcntl.h>
  31 #endif
  32 #include <stdarg.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35
  36 #include <libcontract.h>
  37 #include <sys/contract/process.h>
  38 #include <sys/ctfs.h>
  39
  40 #include "log.h"
  41
  42 #define CT_TEMPLATE     CTFS_ROOT "/process/template"
  43 #define CT_LATEST       CTFS_ROOT "/process/latest"
  44
  45 static int tmpl_fd = -1;
  46
  47 /* Lookup the latest process contract */
  48 static ctid_t
  49 get_active_process_contract_id(void)
  50 {
  51         int stat_fd;
  52         ctid_t ctid = -1;
  53         ct_stathdl_t stathdl;
  54
  55         if ((stat_fd = open64(CT_LATEST, O_RDONLY)) == -1) {
  56                 error("%s: Error opening 'latest' process "
  57                     "contract: %s", __func__, strerror(errno));
  58                 return -1;
  59         }
  60         if (ct_status_read(stat_fd, CTD_COMMON, &stathdl) != 0) {
  61                 error("%s: Error reading process contract "
  62                     "status: %s", __func__, strerror(errno));
  63                 goto out;
  64         }
  65         if ((ctid = ct_status_get_id(stathdl)) < 0) {
  66                 error("%s: Error getting process contract id: %s",
  67                     __func__, strerror(errno));
  68                 goto out;
  69         }
  70
  71         ct_status_free(stathdl);
  72  out:
  73         close(stat_fd);
  74         return ctid;
  75 }
  76
  77 void
  78 solaris_contract_pre_fork(void)
  79 {
  80         if ((tmpl_fd = open64(CT_TEMPLATE, O_RDWR)) == -1) {
  81                 error("%s: open %s: %s", __func__,
  82                     CT_TEMPLATE, strerror(errno));
  83                 return;
  84         }
  85
  86         debug2("%s: setting up process contract template on fd %d",
  87             __func__, tmpl_fd);
  88
  89         /* We have to set certain attributes before activating the template */
  90         if (ct_pr_tmpl_set_fatal(tmpl_fd,
  91             CT_PR_EV_HWERR|CT_PR_EV_SIGNAL|CT_PR_EV_CORE) != 0) {
  92                 error("%s: Error setting process contract template "
  93                     "fatal events: %s", __func__, strerror(errno));
  94                 goto fail;
  95         }
  96         if (ct_tmpl_set_critical(tmpl_fd, CT_PR_EV_HWERR) != 0) {
  97                 error("%s: Error setting process contract template "
  98                     "critical events: %s", __func__, strerror(errno));
  99                 goto fail;
 100         }
 101
 102         /* Now make this the active template for this process. */
 103         if (ct_tmpl_activate(tmpl_fd) != 0) {
 104                 error("%s: Error activating process contract "
 105                     "template: %s", __func__, strerror(errno));
 106                 goto fail;
 107         }
 108         return;
 109
 110  fail:
 111         if (tmpl_fd != -1) {
 112                 close(tmpl_fd);
 113                 tmpl_fd = -1;
 114         }
 115 }
 116
 117 void
 118 solaris_contract_post_fork_child()
 119 {
 120         debug2("%s: clearing process contract template on fd %d",
 121             __func__, tmpl_fd);
 122
 123         /* Clear the active template. */
 124         if (ct_tmpl_clear(tmpl_fd) != 0)
 125                 error("%s: Error clearing active process contract "
 126                     "template: %s", __func__, strerror(errno));
 127
 128         close(tmpl_fd);
 129         tmpl_fd = -1;
 130 }
 131
 132 void
 133 solaris_contract_post_fork_parent(pid_t pid)
 134 {
 135         ctid_t ctid;
 136         char ctl_path[256];
 137         int r, ctl_fd = -1, stat_fd = -1;
 138
 139         debug2("%s: clearing template (fd %d)", __func__, tmpl_fd);
 140
 141         if (tmpl_fd == -1)
 142                 return;
 143
 144         /* First clear the active template. */
 145         if ((r = ct_tmpl_clear(tmpl_fd)) != 0)
 146                 error("%s: Error clearing active process contract "
 147                     "template: %s", __func__, strerror(errno));
 148
 149         close(tmpl_fd);
 150         tmpl_fd = -1;
 151
 152         /*
 153          * If either the fork didn't succeed (pid < 0), or clearing
 154          * th active contract failed (r != 0), then we have nothing
 155          * more do.
 156          */
 157         if (r != 0 || pid <= 0)
 158                 return;
 159
 160         /* Now lookup and abandon the contract we've created. */
 161         ctid = get_active_process_contract_id();
 162
 163         debug2("%s: abandoning contract id %ld", __func__, ctid);
 164
 165         snprintf(ctl_path, sizeof(ctl_path),
 166             CTFS_ROOT "/process/%ld/ctl", ctid);
 167         if ((ctl_fd = open64(ctl_path, O_WRONLY)) < 0) {
 168                 error("%s: Error opening process contract "
 169                     "ctl file: %s", __func__, strerror(errno));
 170                 goto fail;
 171         }
 172         if (ct_ctl_abandon(ctl_fd) < 0) {
 173                 error("%s: Error abandoning process contract: %s",
 174                     __func__, strerror(errno));
 175                 goto fail;
 176         }
 177         close(ctl_fd);
 178         return;
 179
 180  fail:
 181         if (tmpl_fd != -1) {
 182                 close(tmpl_fd);
 183                 tmpl_fd = -1;
 184         }
 185         if (stat_fd != -1)
 186                 close(stat_fd);
 187         if (ctl_fd != -1)
 188                 close(ctl_fd);
 189 }
 190 #endif