server/procfs.c

   1 /*
   2  * Server-side /proc support for Solaris
   3  *
   4  * Copyright (C) 2007 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <signal.h>
  28 #include <stdarg.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31
  32 #include "ntstatus.h"
  33 #define WIN32_NO_STATUS
  34 #include "winternl.h"
  35
  36 #include "file.h"
  37 #include "process.h"
  38 #include "thread.h"
  39
  40 #ifdef USE_PROCFS
  41
  42 /* procfs doesn't support large files */
  43 # undef _FILE_OFFSET_BITS
  44 # define _FILE_OFFSET_BITS 32
  45 #include <procfs.h>
  46
  47 static int open_proc_as( struct process *process, int flags )
  48 {
  49     char buffer[32];
  50     int fd;
  51
  52     if (process->unix_pid == -1)
  53     {
  54         set_error( STATUS_ACCESS_DENIED );
  55         return -1;
  56     }
  57
  58     sprintf( buffer, "/proc/%u/as", process->unix_pid );
  59     if ((fd = open( buffer, flags )) == -1)
  60     {
  61         if (errno == ENOENT)  /* probably got killed */
  62         {
  63             process->unix_pid = -1;
  64             set_error( STATUS_ACCESS_DENIED );
  65         }
  66         else file_set_error();
  67     }
  68     return fd;
  69 }
  70
  71 static int open_proc_lwpctl( struct thread *thread )
  72 {
  73     char buffer[48];
  74     int fd;
  75
  76     if (thread->unix_pid == -1) return -1;
  77
  78     sprintf( buffer, "/proc/%u/lwp/%u/lwpctl", thread->unix_pid, thread->unix_tid );
  79     if ((fd = open( buffer, O_WRONLY )) == -1)
  80     {
  81         if (errno == ENOENT)  /* probably got killed */
  82             thread->unix_pid = thread->unix_tid = -1;
  83         else
  84             file_set_error();
  85     }
  86     return fd;
  87 }
  88
  89
  90 /* handle a SIGCHLD signal */
  91 void sigchld_callback(void)
  92 {
  93     assert( 0 );  /* should only be called when using ptrace */
  94 }
  95
  96 /* initialize the process tracing mechanism */
  97 void init_tracing_mechanism(void)
  98 {
  99     /* no initialization needed */
 100 }
 101
 102 /* initialize the per-process tracing mechanism */
 103 void init_process_tracing( struct process *process )
 104 {
 105     /* setup is done on-demand */
 106 }
 107
 108 /* terminate the per-process tracing mechanism */
 109 void finish_process_tracing( struct process *process )
 110 {
 111 }
 112
 113 /* send a Unix signal to a specific thread */
 114 int send_thread_signal( struct thread *thread, int sig )
 115 {
 116     int fd = open_proc_lwpctl( thread );
 117     long kill[2];
 118     ssize_t ret;
 119
 120     if (fd == -1) return 0;
 121
 122     kill[0] = PCKILL;
 123     kill[1] = sig;
 124     ret = write( fd, kill, sizeof(kill) );
 125     close( fd );
 126     return (ret == sizeof(kill));
 127 }
 128
 129 /* read data from a process memory space */
 130 int read_process_memory( struct process *process, client_ptr_t ptr, size_t size, char *dest )
 131 {
 132     ssize_t ret;
 133     int fd;
 134
 135     if ((off_t)ptr != ptr)
 136     {
 137         set_error( STATUS_ACCESS_DENIED );
 138         return 0;
 139     }
 140
 141     if ((fd = open_proc_as( process, O_RDONLY )) == -1) return 0;
 142
 143     ret = pread( fd, dest, size, (off_t)ptr );
 144     close( fd );
 145     if (ret == size) return 1;
 146
 147     if (ret == -1) file_set_error();
 148     else set_error( STATUS_ACCESS_VIOLATION );
 149     return 0;
 150 }
 151
 152 /* write data to a process memory space */
 153 int write_process_memory( struct process *process, client_ptr_t ptr, size_t size, const char *src )
 154 {
 155     ssize_t ret;
 156     int fd;
 157
 158     if ((off_t)ptr != ptr)
 159     {
 160         set_error( STATUS_ACCESS_DENIED );
 161         return 0;
 162     }
 163
 164     if ((fd = open_proc_as( process, O_RDONLY )) == -1) return 0;
 165
 166     ret = pwrite( fd, src, size, (off_t)ptr );
 167     close( fd );
 168     if (ret == size) return 1;
 169
 170     if (ret == -1) file_set_error();
 171     else set_error( STATUS_ACCESS_VIOLATION );
 172     return 0;
 173 }
 174
 175 /* retrieve an LDT selector entry */
 176 void get_selector_entry( struct thread *thread, int entry, unsigned int *base,
 177                          unsigned int *limit, unsigned char *flags )
 178 {
 179     ssize_t ret;
 180     off_t pos = thread->process->ldt_copy;
 181     int fd;
 182
 183     if (!pos)
 184     {
 185         set_error( STATUS_ACCESS_DENIED );
 186         return;
 187     }
 188     if ((fd = open_proc_as( thread->process, O_RDONLY )) == -1) return;
 189
 190     ret = pread( fd, base, sizeof(*base), pos + entry*sizeof(int) );
 191     if (ret != sizeof(*base)) goto error;
 192     ret = pread( fd, limit, sizeof(*limit), pos + (8192 + entry)*sizeof(int) );
 193     if (ret != sizeof(*limit)) goto error;
 194     ret = pread( fd, flags, sizeof(*flags), pos + 2*8192*sizeof(int) + entry );
 195     if (ret != sizeof(*flags)) goto error;
 196     close( fd );
 197     return;
 198
 199 error:
 200     if (ret == -1) file_set_error();
 201     else set_error( STATUS_ACCESS_VIOLATION );
 202     close( fd );
 203 }
 204
 205 /* retrieve the thread registers */
 206 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
 207 {
 208     /* FIXME: get debug registers */
 209 }
 210
 211 /* set the thread registers */
 212 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
 213 {
 214     /* FIXME: set debug registers */
 215 }
 216
 217 #endif /* USE_PROCFS */