debugger/external.c

   1 /*
   2  *  File    : external.c
   3  *  Author  : Kevin Holbrook
   4  *  Created : July 18, 1999
   5  *
   6  *  Convenience functions to handle use of external debugger.
   7  *
   8  */
   9
  10
  11 #include <unistd.h>
  12 #include <errno.h>
  13 #include <stdlib.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16
  17 #include "options.h"
  18
  19 #define DBG_BUFF_SIZE  12
  20
  21 #define DBG_EXTERNAL_DEFAULT   "gdb"
  22 #define DBG_LOCATION_DEFAULT   "/usr/local/bin/wine"
  23 #define DBG_SLEEPTIME_DEFAULT  120
  24
  25
  26
  27 /* DEBUG_ExternalDebugger
  28  *
  29  * This function invokes an external debugger on the current
  30  * wine process. The form of the command executed is:
  31  *  <debugger image> <wine image> <attach process id>
  32  *
  33  * The debugger command is normally invoked by a newly created xterm.
  34  *
  35  * The current calling process is temporarily put to sleep
  36  * so that the invoked debugger has time to come up and attach.
  37  *
  38  * The following environment variables may be used:
  39  *
  40  *   Name                Use                                      Default
  41  *  -------------------------------------------------------------------------------------
  42  *   WINE_DBG_EXTERNAL   debugger command to invoke               ("gdb")
  43  *   WINE_DBG_LOCATION   fully qualified location of wine image   ("/usr/local/bin/wine")
  44  *   WINE_DBG_NO_XTERM   if set do not invoke xterm with command  (not set)
  45  *   WINE_DBG_SLEEPTIME  number of seconds to make process sleep  (120)
  46  *
  47  *
  48  * Usage:
  49  *
  50  *   #include "debugtools.h"
  51  *
  52  *   DEBUG_ExternalDebugger();
  53  *
  54  *
  55  * Environment Example:
  56  *
  57  *   export WINE_DBG_EXTERNAL="ddd"
  58  *   export WINE_DBG_NO_XTERM=1
  59  *   export WINE_DBG_SLEEPTIME=60
  60  *
  61  */
  62
  63 void DEBUG_ExternalDebugger(void)
  64 {
  65   pid_t attach_pid;
  66   pid_t child_pid;
  67   int   dbg_sleep_secs = DBG_SLEEPTIME_DEFAULT;
  68   char *dbg_sleeptime;
  69
  70
  71   dbg_sleeptime = getenv("WINE_DBG_SLEEPTIME");
  72
  73   /* convert sleep time string to integer seconds */
  74   if (dbg_sleeptime)
  75   {
  76     dbg_sleep_secs = atoi(dbg_sleeptime);
  77
  78     /* check for conversion error */
  79     if (dbg_sleep_secs == 0)
  80       dbg_sleep_secs = DBG_SLEEPTIME_DEFAULT;
  81   }
  82
  83   /* get the curent process id */
  84   attach_pid = getpid();
  85
  86   /* create new process */
  87   child_pid = fork();
  88
  89   /* check if we are the child process */
  90   if (child_pid == 0)
  91   {
  92     int  status;
  93     const char *dbg_external;
  94     const char *dbg_wine_location;
  95     const char *dbg_no_xterm;
  96     char pid_string[DBG_BUFF_SIZE];
  97
  98
  99     /* check settings in environment for debugger to use */
 100     dbg_external      = getenv("WINE_DBG_EXTERNAL");
 101     dbg_wine_location = getenv("WINE_DBG_LOCATION");
 102     dbg_no_xterm      = getenv("WINE_DBG_NO_XTERM");
 103
 104     /* if not set in environment, use default */
 105     if (!dbg_external)
 106       dbg_external = "gdb";
 107
 108     /* if not set in environment, use default */
 109     if (!dbg_wine_location)
 110       dbg_wine_location = argv0;
 111
 112     /* check for empty string in WINE_DBG_NO_XTERM */
 113     if (dbg_no_xterm && (strlen(dbg_no_xterm) < 1))
 114       dbg_no_xterm = NULL;
 115
 116     /* clear the buffer */
 117     memset(pid_string, 0, DBG_BUFF_SIZE);
 118
 119     /* make pid into string */
 120     sprintf(pid_string, "%ld", (long) attach_pid);
 121
 122     /* now exec the debugger to get it's own clean memory space */
 123     if (dbg_no_xterm)
 124       status = execlp(dbg_external, dbg_external, dbg_wine_location, pid_string, NULL);
 125     else
 126       status = execlp("xterm", "xterm", "-e", dbg_external, dbg_wine_location, pid_string, NULL);
 127
 128     if (status == -1)
 129     {
 130       if (dbg_no_xterm)
 131         fprintf(stderr, "DEBUG_ExternalDebugger failed to execute \"%s %s %s\", errno = %d\n",
 132                 dbg_external, dbg_wine_location, pid_string, errno);
 133       else
 134         fprintf(stderr, "DEBUG_ExternalDebugger failed to execute \"xterm -e %s %s %s\", errno = %d\n",
 135                 dbg_external, dbg_wine_location, pid_string, errno);
 136     }
 137
 138   }
 139   else if (child_pid != -1)
 140   {
 141     /* make the parent/caller sleep so the child/debugger can catch it */
 142     sleep(dbg_sleep_secs);
 143   }
 144   else
 145     fprintf(stderr, "DEBUG_ExternalDebugger failed.\n");
 146
 147 }
 148
 149