Sweden-Number/debugger/ext_debugger.c

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/*
* File : external.c
* Author : Kevin Holbrook
* Created : July 18, 1999
*
* Convenience functions to handle use of external debugger.
*
*/
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define DBG_BUFF_SIZE 12
#define DBG_EXTERNAL_DEFAULT "gdb"
#define DBG_LOCATION_DEFAULT "/usr/local/bin/wine"
#define DBG_SLEEPTIME_DEFAULT 120
/* DEBUG_ExternalDebugger
*
* This function invokes an external debugger on the current
* wine process. The form of the command executed is:
* <debugger image> <wine image> <attach process id>
*
* The debugger command is normally invoked by a newly created xterm.
*
* The current calling process is temporarily put to sleep
* so that the invoked debugger has time to come up and attach.
*
* The following environment variables may be used:
*
* Name Use Default
* -------------------------------------------------------------------------------------
* WINE_DBG_EXTERNAL debugger command to invoke ("gdb")
* WINE_DBG_LOCATION fully qualified location of wine image ("/usr/local/bin/wine")
* WINE_DBG_NO_XTERM if set do not invoke xterm with command (not set)
* WINE_DBG_SLEEPTIME number of seconds to make process sleep (120)
*
*
* Usage:
*
* #include "debugtools.h"
*
* DEBUG_ExternalDebugger();
*
*
* Environment Example:
*
* export WINE_DBG_EXTERNAL="ddd"
* export WINE_DBG_NO_XTERM=1
* export WINE_DBG_SLEEPTIME=60
*
*/
void DEBUG_ExternalDebugger(void)
{
pid_t attach_pid;
pid_t child_pid;
int dbg_sleep_secs = DBG_SLEEPTIME_DEFAULT;
char *dbg_sleeptime;
dbg_sleeptime = getenv("WINE_DBG_SLEEPTIME");
/* convert sleep time string to integer seconds */
if (dbg_sleeptime)
{
dbg_sleep_secs = atoi(dbg_sleeptime);
/* check for conversion error */
if (dbg_sleep_secs == 0)
dbg_sleep_secs = DBG_SLEEPTIME_DEFAULT;
}
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/* get the current process id */
attach_pid = getpid();
/* create new process */
child_pid = fork();
/* check if we are the child process */
if (child_pid == 0)
{
int status;
const char *dbg_external;
const char *dbg_wine_location;
const char *dbg_no_xterm;
char pid_string[DBG_BUFF_SIZE];
/* check settings in environment for debugger to use */
dbg_external = getenv("WINE_DBG_EXTERNAL");
dbg_wine_location = getenv("WINE_DBG_LOCATION");
dbg_no_xterm = getenv("WINE_DBG_NO_XTERM");
/* if not set in environment, use default */
if (!dbg_external)
dbg_external = "gdb";
/* if not set in environment, use default */
if (!dbg_wine_location)
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dbg_wine_location = "wine";
/* check for empty string in WINE_DBG_NO_XTERM */
if (dbg_no_xterm && (strlen(dbg_no_xterm) < 1))
dbg_no_xterm = NULL;
/* clear the buffer */
memset(pid_string, 0, DBG_BUFF_SIZE);
/* make pid into string */
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sprintf(pid_string, "%ld", (long) attach_pid);
/* now exec the debugger to get it's own clean memory space */
if (dbg_no_xterm)
status = execlp(dbg_external, dbg_external, dbg_wine_location, pid_string, NULL);
else
status = execlp("xterm", "xterm", "-e", dbg_external, dbg_wine_location, pid_string, NULL);
if (status == -1)
{
if (dbg_no_xterm)
fprintf(stderr, "DEBUG_ExternalDebugger failed to execute \"%s %s %s\" (%s)\n",
dbg_external, dbg_wine_location, pid_string, strerror(errno));
else
fprintf(stderr, "DEBUG_ExternalDebugger failed to execute \"xterm -e %s %s %s\" (%s)\n",
dbg_external, dbg_wine_location, pid_string, strerror(errno));
}
}
else if (child_pid != -1)
{
/* make the parent/caller sleep so the child/debugger can catch it */
sleep(dbg_sleep_secs);
}
else
fprintf(stderr, "DEBUG_ExternalDebugger failed.\n");
}