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 #include <procfs.h>
  43
  44 static int open_proc_as( struct process *process, int flags )
  45 {
  46     char buffer[32];
  47     int fd;
  48
  49     if (process->unix_pid == -1)
  50     {
  51         set_error( STATUS_ACCESS_DENIED );
  52         return -1;
  53     }
  54
  55     sprintf( buffer, "/proc/%u/as", process->unix_pid );
  56     if ((fd = open( buffer, flags )) == -1)
  57     {
  58         if (errno == ENOENT)  /* probably got killed */
  59         {
  60             process->unix_pid = -1;
  61             set_error( STATUS_ACCESS_DENIED );
  62         }
  63         else file_set_error();
  64     }
  65     return fd;
  66 }
  67
  68 static int open_proc_lwpctl( struct thread *thread )
  69 {
  70     char buffer[48];
  71     int fd;
  72
  73     if (thread->unix_pid == -1) return -1;
  74
  75     sprintf( buffer, "/proc/%u/lwp/%u/lwpctl", thread->unix_pid, thread->unix_tid );
  76     if ((fd = open( buffer, O_WRONLY )) == -1)
  77     {
  78         if (errno == ENOENT)  /* probably got killed */
  79             thread->unix_pid = thread->unix_tid = -1;
  80         else
  81             file_set_error();
  82     }
  83     return fd;
  84 }
  85
  86
  87 /* handle a SIGCHLD signal */
  88 void sigchld_callback(void)
  89 {
  90     assert( 0 );  /* should only be called when using ptrace */
  91 }
  92
  93 /* initialize the process tracing mechanism */
  94 void init_tracing_mechanism(void)
  95 {
  96     /* no initialization needed */
  97 }
  98
  99 /* initialize the per-process tracing mechanism */
 100 void init_process_tracing( struct process *process )
 101 {
 102     /* setup is done on-demand */
 103 }
 104
 105 /* terminate the per-process tracing mechanism */
 106 void finish_process_tracing( struct process *process )
 107 {
 108 }
 109
 110 /* send a Unix signal to a specific thread */
 111 int send_thread_signal( struct thread *thread, int sig )
 112 {
 113     int fd = open_proc_lwpctl( thread );
 114     long kill[2];
 115     ssize_t ret;
 116
 117     if (fd == -1) return 0;
 118
 119     kill[0] = PCKILL;
 120     kill[1] = sig;
 121     ret = write( fd, kill, sizeof(kill) );
 122     close( fd );
 123     return (ret == sizeof(kill));
 124 }
 125
 126 /* read data from a process memory space */
 127 int read_process_memory( struct process *process, const void *ptr, size_t size, char *dest )
 128 {
 129     ssize_t ret;
 130     int fd = open_proc_as( process, O_RDONLY );
 131
 132     if (fd == -1) return 0;
 133
 134     ret = pread( fd, dest, size, (off_t)ptr );
 135     close( fd );
 136     if (ret == size) return 1;
 137
 138     if (ret == -1) file_set_error();
 139     else set_error( STATUS_ACCESS_VIOLATION );
 140     return 0;
 141 }
 142
 143 /* write data to a process memory space */
 144 int write_process_memory( struct process *process, void *ptr, size_t size, const char *src )
 145 {
 146     ssize_t ret;
 147     int fd = open_proc_as( process, O_WRONLY );
 148
 149     if (fd == -1) return 0;
 150
 151     ret = pwrite( fd, src, size, (off_t)ptr );
 152     close( fd );
 153     if (ret == size) return 1;
 154
 155     if (ret == -1) file_set_error();
 156     else set_error( STATUS_ACCESS_VIOLATION );
 157     return 0;
 158 }
 159
 160 /* retrieve an LDT selector entry */
 161 void get_selector_entry( struct thread *thread, int entry, unsigned int *base,
 162                          unsigned int *limit, unsigned char *flags )
 163 {
 164     ssize_t ret;
 165     off_t pos = (off_t)thread->process->ldt_copy;
 166     int fd = open_proc_as( thread->process, O_RDONLY );
 167
 168     if (fd == -1) return;
 169
 170     ret = pread( fd, base, sizeof(*base), pos + entry*sizeof(int) );
 171     if (ret != sizeof(*base)) goto error;
 172     ret = pread( fd, limit, sizeof(*limit), pos + (8192 + entry)*sizeof(int) );
 173     if (ret != sizeof(*limit)) goto error;
 174     ret = pread( fd, flags, sizeof(*flags), pos + 2*8192*sizeof(int) + entry );
 175     if (ret != sizeof(*flags)) goto error;
 176     close( fd );
 177     return;
 178
 179 error:
 180     if (ret == -1) file_set_error();
 181     else set_error( STATUS_ACCESS_VIOLATION );
 182     close( fd );
 183 }
 184
 185 /* retrieve the thread registers */
 186 void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
 187 {
 188     /* all other regs are handled on the client side */
 189     assert( (flags | CONTEXT_i386) == CONTEXT_DEBUG_REGISTERS );
 190
 191     /* FIXME: get debug registers */
 192 }
 193
 194 /* set the thread registers */
 195 void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
 196 {
 197     /* all other regs are handled on the client side */
 198     assert( (flags | CONTEXT_i386) == CONTEXT_DEBUG_REGISTERS );
 199
 200     /* FIXME: set debug registers */
 201 }
 202
 203 #endif /* USE_PROCFS */