source: vbox/trunk/src/VBox/GuestHost/OpenGL/util/process.c@ 24107

/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include "cr_error.h"
#include "cr_process.h"
#include "cr_string.h"
#include "cr_mem.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
#ifndef WINDOWS
#include <unistd.h>
#else
#pragma warning ( disable : 4127 )
#endif

/**
 * Sleep/pause for the given number of seconds.
 */
void crSleep( unsigned int seconds )
{
#ifdef WINDOWS
  Sleep(seconds*1000); /* milliseconds */
#else
  sleep(seconds);
#endif
}

/**
 * Sleep/pause for the given number of milliseconds.
 */
void crMsleep( unsigned int msec )
{
#ifdef WINDOWS
     Sleep(msec); 
#else
     usleep(msec*1000); /* usecs */
#endif
}


/*
 * Spawn (i.e. fork/exec) a new process.
 */
CRpid crSpawn( const char *command, const char *argv[] )
{
#ifdef WINDOWS
        char newargv[1000];
        int i;
        STARTUPINFO si;
        PROCESS_INFORMATION pi;

        (void) command;

        ZeroMemory( &si, sizeof(si) );
        si.cb = sizeof(si);
        ZeroMemory( &pi, sizeof(pi) );

        crStrncpy(newargv, argv[0], 1000 );
        for (i = 1; argv[i]; i++) {
                crStrcat(newargv, " ");
                crStrcat(newargv, argv[i]);
        }

        if ( !CreateProcess(NULL, newargv, NULL, NULL, FALSE, 0, NULL,
                                NULL, &si, &pi) )
        {
                crWarning("crSpawn failed, %d", GetLastError());
                return 0;
        }
        return pi.hProcess;
#else
        pid_t pid;
        if ((pid = fork()) == 0)
        {
                /* I'm the child */
                int err = execvp(command, (char * const *) argv);
                crWarning("crSpawn failed (return code: %d)", err);
                return 0;
        }
        return (unsigned long) pid;
#endif
}


/*
 * Kill the named process.
 */
void crKill( CRpid pid )
{
#ifdef WINDOWS
        TerminateProcess( pid, 0 );
#else
        kill((pid_t) pid, SIGKILL);
#endif
}


/*
 * Return the name of the running process.
 * name[0] will be zero if anything goes wrong.
 */
void crGetProcName( char *name, int maxLen )
{
#ifdef WINDOWS
        char command[1000];
        int c = 0;

        *name = 0;
        
        if (!GetModuleFileName( NULL, command, maxLen ))
                return;

        while (1) {
                /* crude mechanism to blank out the backslashes
                 * in the Windows filename and recover the actual
                 * program name to return */
                if (crStrstr(command, "\\")) {
                        crStrncpy(name, command+c+1, maxLen);
                        command[c] = 32;
                        c++;
                }
                else
                        break;
        }
#else
        /* Unix:
         * Call getpid() to get our process ID.
         * Then use system() to write the output of 'ps' to a temp file.
         * Read/scan the temp file to map the process ID to process name.
         * I'd love to find a better solution! (BrianP)
         */
        FILE *f;
        pid_t pid = getpid();
        char *tmp, command[1000];

        /* init to NULL in case of early return */
        *name = 0;

        /* get a temporary file name */
        tmp = tmpnam(NULL);
        if (!tmp)
                return;

        /* pipe output of ps to temp file */
        sprintf(command, "ps > %s", tmp);
        system(command);

        /* open/scan temp file */
        f = fopen(tmp, "r");
        if (f) {
                char buffer[1000], cmd[1000];
                while (!feof(f)) {
                        int id;
                        fgets(buffer, 999, f);
                        sscanf(buffer, "%d %*s %*s %999s", &id, cmd);
                        if (id == pid) {
                                crStrncpy(name, cmd, maxLen);
                                break;
                        }
                }
                fclose(f);
        }
        remove(tmp);
#endif
}


/*
 * Return current directory string.
 */
void crGetCurrentDir( char *dir, int maxLen )
{
#ifdef WINDOWS
  if (!GetCurrentDirectory(maxLen, dir))
        dir[0] = 0;
#else
  if (!getcwd(dir, maxLen))
        dir[0] = 0;
#endif
}


/**
 * Return current process ID number.
 */
CRpid crGetPID(void)
{
#ifdef WINDOWS 
  //return _getpid();
  return GetCurrentProcess();
#else
  return getpid();
#endif
}


#if 0
/* simple test harness */
int main(int argc, char **argv)
{
   char name[100];
   printf("argv[0] = %s\n", argv[0]);

   crGetProcName(name, 100);
   printf("crGetProcName returned %s\n", name);

   return 0;
}
#endif