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e33cd7e20305ba81e47cc17cfafdfb20d543e30d
wxWidgets/src/unix/utilsunx.cpp
Paul Cornett e33cd7e203 build fix for wxUSE_SOCKETS==0 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62209 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2009-09-30 15:38:23 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: src/unix/utilsunx.cpp
// Purpose: generic Unix implementation of many wx functions (for wxBase)
// Author: Vadim Zeitlin
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling, Vadim Zeitlin
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// for compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#include "wx/utils.h"
#define USE_PUTENV (!defined(HAVE_SETENV) && defined(HAVE_PUTENV))
#ifndef WX_PRECOMP
#include "wx/string.h"
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/app.h"
#include "wx/wxcrtvararg.h"
#if USE_PUTENV
#include "wx/module.h"
#include "wx/hashmap.h"
#endif
#endif
#include "wx/apptrait.h"
#include "wx/process.h"
#include "wx/thread.h"
#include "wx/cmdline.h"
#include "wx/wfstream.h"
#include "wx/private/selectdispatcher.h"
#include "wx/private/fdiodispatcher.h"
#include "wx/unix/execute.h"
#include "wx/unix/private.h"
#ifdef wxHAS_GENERIC_PROCESS_CALLBACK
#include "wx/private/fdiodispatcher.h"
#endif
#include <pwd.h>
#include <sys/wait.h> // waitpid()
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#define HAS_PIPE_INPUT_STREAM (wxUSE_STREAMS && wxUSE_FILE)
#if HAS_PIPE_INPUT_STREAM
// define this to let wxexec.cpp know that we know what we're doing
#define _WX_USED_BY_WXEXECUTE_
#include "../common/execcmn.cpp"
#endif // HAS_PIPE_INPUT_STREAM
#if defined(__MWERKS__) && defined(__MACH__)
#ifndef WXWIN_OS_DESCRIPTION
#define WXWIN_OS_DESCRIPTION "MacOS X"
#endif
#ifndef HAVE_NANOSLEEP
#define HAVE_NANOSLEEP
#endif
#ifndef HAVE_UNAME
#define HAVE_UNAME
#endif
// our configure test believes we can use sigaction() if the function is
// available but Metrowekrs with MSL run-time does have the function but
// doesn't have sigaction struct so finally we can't use it...
#ifdef __MSL__
#undef wxUSE_ON_FATAL_EXCEPTION
#define wxUSE_ON_FATAL_EXCEPTION 0
#endif
#endif
// not only the statfs syscall is called differently depending on platform, but
// one of its incarnations, statvfs(), takes different arguments under
// different platforms and even different versions of the same system (Solaris
// 7 and 8): if you want to test for this, don't forget that the problems only
// appear if the large files support is enabled
#ifdef HAVE_STATFS
#ifdef __BSD__
#include <sys/param.h>
#include <sys/mount.h>
#else // !__BSD__
#include <sys/vfs.h>
#endif // __BSD__/!__BSD__
#define wxStatfs statfs
#ifndef HAVE_STATFS_DECL
// some systems lack statfs() prototype in the system headers (AIX 4)
extern "C" int statfs(const char *path, struct statfs *buf);
#endif
#endif // HAVE_STATFS
#ifdef HAVE_STATVFS
#include <sys/statvfs.h>
#define wxStatfs statvfs
#endif // HAVE_STATVFS
#if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
// WX_STATFS_T is detected by configure
#define wxStatfs_t WX_STATFS_T
#endif
// SGI signal.h defines signal handler arguments differently depending on
// whether _LANGUAGE_C_PLUS_PLUS is set or not - do set it
#if defined(__SGI__) && !defined(_LANGUAGE_C_PLUS_PLUS)
#define _LANGUAGE_C_PLUS_PLUS 1
#endif // SGI hack
#include <stdarg.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>
#include <fcntl.h> // for O_WRONLY and friends
#include <time.h> // nanosleep() and/or usleep()
#include <ctype.h> // isspace()
#include <sys/time.h> // needed for FD_SETSIZE
#ifdef HAVE_UNAME
#include <sys/utsname.h> // for uname()
#endif // HAVE_UNAME
// Used by wxGetFreeMemory().
#ifdef __SGI__
#include <sys/sysmp.h>
#include <sys/sysinfo.h> // for SAGET and MINFO structures
#endif
// ----------------------------------------------------------------------------
// conditional compilation
// ----------------------------------------------------------------------------
// many versions of Unices have this function, but it is not defined in system
// headers - please add your system here if it is the case for your OS.
// SunOS < 5.6 (i.e. Solaris < 2.6) and DG-UX are like this.
#if !defined(HAVE_USLEEP) && \
((defined(__SUN__) && !defined(__SunOs_5_6) && \
!defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \
defined(__osf__) || defined(__EMX__))
extern "C"
{
#ifdef __EMX__
/* I copied this from the XFree86 diffs. AV. */
#define INCL_DOSPROCESS
#include <os2.h>
inline void usleep(unsigned long delay)
{
DosSleep(delay ? (delay/1000l) : 1l);
}
#else // Unix
int usleep(unsigned int usec);
#endif // __EMX__/Unix
};
#define HAVE_USLEEP 1
#endif // Unices without usleep()
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// sleeping
// ----------------------------------------------------------------------------
void wxSleep(int nSecs)
{
sleep(nSecs);
}
void wxMicroSleep(unsigned long microseconds)
{
#if defined(HAVE_NANOSLEEP)
timespec tmReq;
tmReq.tv_sec = (time_t)(microseconds / 1000000);
tmReq.tv_nsec = (microseconds % 1000000) * 1000;
// we're not interested in remaining time nor in return value
(void)nanosleep(&tmReq, NULL);
#elif defined(HAVE_USLEEP)
// uncomment this if you feel brave or if you are sure that your version
// of Solaris has a safe usleep() function but please notice that usleep()
// is known to lead to crashes in MT programs in Solaris 2.[67] and is not
// documented as MT-Safe
#if defined(__SUN__) && wxUSE_THREADS
#error "usleep() cannot be used in MT programs under Solaris."
#endif // Sun
usleep(microseconds);
#elif defined(HAVE_SLEEP)
// under BeOS sleep() takes seconds (what about other platforms, if any?)
sleep(microseconds * 1000000);
#else // !sleep function
#error "usleep() or nanosleep() function required for wxMicroSleep"
#endif // sleep function
}
void wxMilliSleep(unsigned long milliseconds)
{
wxMicroSleep(milliseconds*1000);
}
// ----------------------------------------------------------------------------
// process management
// ----------------------------------------------------------------------------
int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags)
{
int err = kill((pid_t) (flags & wxKILL_CHILDREN) ? -pid : pid, (int)sig);
if ( rc )
{
switch ( err ? errno : 0 )
{
case 0:
*rc = wxKILL_OK;
break;
case EINVAL:
*rc = wxKILL_BAD_SIGNAL;
break;
case EPERM:
*rc = wxKILL_ACCESS_DENIED;
break;
case ESRCH:
*rc = wxKILL_NO_PROCESS;
break;
default:
// this goes against Unix98 docs so log it
wxLogDebug(wxT("unexpected kill(2) return value %d"), err);
// something else...
*rc = wxKILL_ERROR;
}
}
return err;
}
// Shutdown or reboot the PC
bool wxShutdown(int flags)
{
flags &= ~wxSHUTDOWN_FORCE;
wxChar level;
switch ( flags )
{
case wxSHUTDOWN_POWEROFF:
level = wxT('0');
break;
case wxSHUTDOWN_REBOOT:
level = wxT('6');
break;
case wxSHUTDOWN_LOGOFF:
// TODO: use dcop to log off?
return false;
default:
wxFAIL_MSG( wxT("unknown wxShutdown() flag") );
return false;
}
return system(wxString::Format("init %c", level).mb_str()) == 0;
}
// ----------------------------------------------------------------------------
// wxStream classes to support IO redirection in wxExecute
// ----------------------------------------------------------------------------
#if HAS_PIPE_INPUT_STREAM
bool wxPipeInputStream::CanRead() const
{
if ( m_lasterror == wxSTREAM_EOF )
return false;
// check if there is any input available
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
const int fd = m_file->fd();
fd_set readfds;
wxFD_ZERO(&readfds);
wxFD_SET(fd, &readfds);
switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
{
case -1:
wxLogSysError(_("Impossible to get child process input"));
// fall through
case 0:
return false;
default:
wxFAIL_MSG(wxT("unexpected select() return value"));
// still fall through
case 1:
// input available -- or maybe not, as select() returns 1 when a
// read() will complete without delay, but it could still not read
// anything
return !Eof();
}
}
#endif // HAS_PIPE_INPUT_STREAM
// ----------------------------------------------------------------------------
// wxShell
// ----------------------------------------------------------------------------
static wxString wxMakeShellCommand(const wxString& command)
{
wxString cmd;
if ( !command )
{
// just an interactive shell
cmd = wxT("xterm");
}
else
{
// execute command in a shell
cmd << wxT("/bin/sh -c '") << command << wxT('\'');
}
return cmd;
}
bool wxShell(const wxString& command)
{
return wxExecute(wxMakeShellCommand(command), wxEXEC_SYNC) == 0;
}
bool wxShell(const wxString& command, wxArrayString& output)
{
wxCHECK_MSG( !command.empty(), false, wxT("can't exec shell non interactively") );
return wxExecute(wxMakeShellCommand(command), output);
}
namespace
{
// helper class for storing arguments as char** array suitable for passing to
// execvp(), whatever form they were passed to us
class ArgsArray
{
public:
ArgsArray(const wxArrayString& args)
{
Init(args.size());
for ( int i = 0; i < m_argc; i++ )
{
m_argv[i] = wxStrdup(args[i]);
}
}
#if wxUSE_UNICODE
ArgsArray(wchar_t **wargv)
{
int argc = 0;
while ( *wargv++ )
argc++;
Init(argc);
for ( int i = 0; i < m_argc; i++ )
{
m_argv[i] = wxSafeConvertWX2MB(wargv[i]).release();
}
}
#endif // wxUSE_UNICODE
~ArgsArray()
{
for ( int i = 0; i < m_argc; i++ )
{
free(m_argv[i]);
}
delete [] m_argv;
}
operator char**() const { return m_argv; }
private:
void Init(int argc)
{
m_argc = argc;
m_argv = new char *[m_argc + 1];
m_argv[m_argc] = NULL;
}
int m_argc;
char **m_argv;
wxDECLARE_NO_COPY_CLASS(ArgsArray);
};
} // anonymous namespace
// ----------------------------------------------------------------------------
// wxExecute implementations
// ----------------------------------------------------------------------------
#if defined(__DARWIN__)
bool wxMacLaunch(char **argv);
#endif
long wxExecute(const wxString& command, int flags, wxProcess *process)
{
ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
wxCMD_LINE_SPLIT_UNIX));
return wxExecute(argv, flags, process);
}
#if wxUSE_UNICODE
long wxExecute(wchar_t **wargv, int flags, wxProcess *process)
{
ArgsArray argv(wargv);
return wxExecute(argv, flags, process);
}
#endif // wxUSE_UNICODE
// wxExecute: the real worker function
long wxExecute(char **argv, int flags, wxProcess *process)
{
// for the sync execution, we return -1 to indicate failure, but for async
// case we return 0 which is never a valid PID
//
// we define this as a macro, not a variable, to avoid compiler warnings
// about "ERROR_RETURN_CODE value may be clobbered by fork()"
#define ERROR_RETURN_CODE ((flags & wxEXEC_SYNC) ? -1 : 0)
wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
#if wxUSE_THREADS
// fork() doesn't mix well with POSIX threads: on many systems the program
// deadlocks or crashes for some reason. Probably our code is buggy and
// doesn't do something which must be done to allow this to work, but I
// don't know what yet, so for now just warn the user (this is the least we
// can do) about it
wxASSERT_MSG( wxThread::IsMain(),
wxT("wxExecute() can be called only from the main thread") );
#endif // wxUSE_THREADS
#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
// wxMacLaunch() only executes app bundles and only does it asynchronously.
// It returns false if the target is not an app bundle, thus falling
// through to the regular code for non app bundles.
if ( !(flags & wxEXEC_SYNC) && wxMacLaunch(argv) )
{
// we don't have any PID to return so just make up something non null
return -1;
}
#endif // __DARWIN__
// this struct contains all information which we use for housekeeping
wxExecuteData execData;
execData.flags = flags;
execData.process = process;
// create pipes
if ( !execData.pipeEndProcDetect.Create() )
{
wxLogError( _("Failed to execute '%s'\n"), *argv );
return ERROR_RETURN_CODE;
}
// pipes for inter process communication
wxPipe pipeIn, // stdin
pipeOut, // stdout
pipeErr; // stderr
if ( process && process->IsRedirected() )
{
if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
{
wxLogError( _("Failed to execute '%s'\n"), *argv );
return ERROR_RETURN_CODE;
}
}
// fork the process
//
// NB: do *not* use vfork() here, it completely breaks this code for some
// reason under Solaris (and maybe others, although not under Linux)
// But on OpenVMS we do not have fork so we have to use vfork and
// cross our fingers that it works.
#ifdef __VMS
pid_t pid = vfork();
#else
pid_t pid = fork();
#endif
if ( pid == -1 ) // error?
{
wxLogSysError( _("Fork failed") );
return ERROR_RETURN_CODE;
}
else if ( pid == 0 ) // we're in child
{
// NB: we used to close all the unused descriptors of the child here
// but this broke some programs which relied on e.g. FD 1 being
// always opened so don't do it any more, after all there doesn't
// seem to be any real problem with keeping them opened
#if !defined(__VMS) && !defined(__EMX__)
if ( flags & wxEXEC_MAKE_GROUP_LEADER )
{
// Set process group to child process' pid. Then killing -pid
// of the parent will kill the process and all of its children.
setsid();
}
#endif // !__VMS
// reading side can be safely closed but we should keep the write one
// opened, it will be only closed when the process terminates resulting
// in a read notification to the parent
execData.pipeEndProcDetect.Detach(wxPipe::Write);
execData.pipeEndProcDetect.Close();
// redirect stdin, stdout and stderr
if ( pipeIn.IsOk() )
{
if ( dup2(pipeIn[wxPipe::Read], STDIN_FILENO) == -1 ||
dup2(pipeOut[wxPipe::Write], STDOUT_FILENO) == -1 ||
dup2(pipeErr[wxPipe::Write], STDERR_FILENO) == -1 )
{
wxLogSysError(_("Failed to redirect child process input/output"));
}
pipeIn.Close();
pipeOut.Close();
pipeErr.Close();
}
execvp(*argv, argv);
fprintf(stderr, "execvp(");
for ( char **a = argv; *a; a++ )
fprintf(stderr, "%s%s", a == argv ? "" : ", ", *a);
fprintf(stderr, ") failed with error %d!\n", errno);
// there is no return after successful exec()
_exit(-1);
// some compilers complain about missing return - of course, they
// should know that exit() doesn't return but what else can we do if
// they don't?
//
// and, sure enough, other compilers complain about unreachable code
// after exit() call, so we can just always have return here...
#if defined(__VMS) || defined(__INTEL_COMPILER)
return 0;
#endif
}
else // we're in parent
{
// save it for WaitForChild() use
execData.pid = pid;
if (execData.process)
execData.process->SetPid(pid); // and also in the wxProcess
// prepare for IO redirection
#if HAS_PIPE_INPUT_STREAM
// the input buffer bufOut is connected to stdout, this is why it is
// called bufOut and not bufIn
wxStreamTempInputBuffer bufOut,
bufErr;
if ( process && process->IsRedirected() )
{
wxOutputStream *inStream =
new wxFileOutputStream(pipeIn.Detach(wxPipe::Write));
const int fdOut = pipeOut.Detach(wxPipe::Read);
wxPipeInputStream *outStream = new wxPipeInputStream(fdOut);
const int fdErr = pipeErr.Detach(wxPipe::Read);
wxPipeInputStream *errStream = new wxPipeInputStream(fdErr);
process->SetPipeStreams(outStream, inStream, errStream);
bufOut.Init(outStream);
bufErr.Init(errStream);
execData.bufOut = &bufOut;
execData.bufErr = &bufErr;
execData.fdOut = fdOut;
execData.fdErr = fdErr;
}
#endif // HAS_PIPE_INPUT_STREAM
if ( pipeIn.IsOk() )
{
pipeIn.Close();
pipeOut.Close();
pipeErr.Close();
}
// we want this function to work even if there is no wxApp so ensure
// that we have a valid traits pointer
wxConsoleAppTraits traitsConsole;
wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
if ( !traits )
traits = &traitsConsole;
return traits->WaitForChild(execData);
}
#if !defined(__VMS) && !defined(__INTEL_COMPILER)
return ERROR_RETURN_CODE;
#endif
}
#undef ERROR_RETURN_CODE
// ----------------------------------------------------------------------------
// file and directory functions
// ----------------------------------------------------------------------------
const wxChar* wxGetHomeDir( wxString *home )
{
*home = wxGetUserHome();
wxString tmp;
if ( home->empty() )
*home = wxT("/");
#ifdef __VMS
tmp = *home;
if ( tmp.Last() != wxT(']'))
if ( tmp.Last() != wxT('/')) *home << wxT('/');
#endif
return home->c_str();
}
wxString wxGetUserHome( const wxString &user )
{
struct passwd *who = (struct passwd *) NULL;
if ( !user )
{
wxChar *ptr;
if ((ptr = wxGetenv(wxT("HOME"))) != NULL)
{
return ptr;
}
if ((ptr = wxGetenv(wxT("USER"))) != NULL ||
(ptr = wxGetenv(wxT("LOGNAME"))) != NULL)
{
who = getpwnam(wxSafeConvertWX2MB(ptr));
}
// make sure the user exists!
if ( !who )
{
who = getpwuid(getuid());
}
}
else
{
who = getpwnam (user.mb_str());
}
return wxSafeConvertMB2WX(who ? who->pw_dir : 0);
}
// ----------------------------------------------------------------------------
// network and user id routines
// ----------------------------------------------------------------------------
// private utility function which returns output of the given command, removing
// the trailing newline
static wxString wxGetCommandOutput(const wxString &cmd)
{
FILE *f = popen(cmd.ToAscii(), "r");
if ( !f )
{
wxLogSysError(wxT("Executing \"%s\" failed"), cmd.c_str());
return wxEmptyString;
}
wxString s;
char buf[256];
while ( !feof(f) )
{
if ( !fgets(buf, sizeof(buf), f) )
break;
s += wxString::FromAscii(buf);
}
pclose(f);
if ( !s.empty() && s.Last() == wxT('\n') )
s.RemoveLast();
return s;
}
// retrieve either the hostname or FQDN depending on platform (caller must
// check whether it's one or the other, this is why this function is for
// private use only)
static bool wxGetHostNameInternal(wxChar *buf, int sz)
{
wxCHECK_MSG( buf, false, wxT("NULL pointer in wxGetHostNameInternal") );
*buf = wxT('\0');
// we're using uname() which is POSIX instead of less standard sysinfo()
#if defined(HAVE_UNAME)
struct utsname uts;
bool ok = uname(&uts) != -1;
if ( ok )
{
wxStrlcpy(buf, wxSafeConvertMB2WX(uts.nodename), sz);
}
#elif defined(HAVE_GETHOSTNAME)
char cbuf[sz];
bool ok = gethostname(cbuf, sz) != -1;
if ( ok )
{
wxStrlcpy(buf, wxSafeConvertMB2WX(cbuf), sz);
}
#else // no uname, no gethostname
wxFAIL_MSG(wxT("don't know host name for this machine"));
bool ok = false;
#endif // uname/gethostname
if ( !ok )
{
wxLogSysError(_("Cannot get the hostname"));
}
return ok;
}
bool wxGetHostName(wxChar *buf, int sz)
{
bool ok = wxGetHostNameInternal(buf, sz);
if ( ok )
{
// BSD systems return the FQDN, we only want the hostname, so extract
// it (we consider that dots are domain separators)
wxChar *dot = wxStrchr(buf, wxT('.'));
if ( dot )
{
// nuke it
*dot = wxT('\0');
}
}
return ok;
}
bool wxGetFullHostName(wxChar *buf, int sz)
{
bool ok = wxGetHostNameInternal(buf, sz);
if ( ok )
{
if ( !wxStrchr(buf, wxT('.')) )
{
struct hostent *host = gethostbyname(wxSafeConvertWX2MB(buf));
if ( !host )
{
wxLogSysError(_("Cannot get the official hostname"));
ok = false;
}
else
{
// the canonical name
wxStrlcpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
}
}
//else: it's already a FQDN (BSD behaves this way)
}
return ok;
}
bool wxGetUserId(wxChar *buf, int sz)
{
struct passwd *who;
*buf = wxT('\0');
if ((who = getpwuid(getuid ())) != NULL)
{
wxStrlcpy (buf, wxSafeConvertMB2WX(who->pw_name), sz);
return true;
}
return false;
}
bool wxGetUserName(wxChar *buf, int sz)
{
#ifdef HAVE_PW_GECOS
struct passwd *who;
*buf = wxT('\0');
if ((who = getpwuid (getuid ())) != NULL)
{
char *comma = strchr(who->pw_gecos, ',');
if (comma)
*comma = '\0'; // cut off non-name comment fields
wxStrlcpy(buf, wxSafeConvertMB2WX(who->pw_gecos), sz);
return true;
}
return false;
#else // !HAVE_PW_GECOS
return wxGetUserId(buf, sz);
#endif // HAVE_PW_GECOS/!HAVE_PW_GECOS
}
bool wxIsPlatform64Bit()
{
const wxString machine = wxGetCommandOutput(wxT("uname -m"));
// the test for "64" is obviously not 100% reliable but seems to work fine
// in practice
return machine.Contains(wxT("64")) ||
machine.Contains(wxT("alpha"));
}
#ifdef __LINUX__
wxLinuxDistributionInfo wxGetLinuxDistributionInfo()
{
const wxString id = wxGetCommandOutput(wxT("lsb_release --id"));
const wxString desc = wxGetCommandOutput(wxT("lsb_release --description"));
const wxString rel = wxGetCommandOutput(wxT("lsb_release --release"));
const wxString codename = wxGetCommandOutput(wxT("lsb_release --codename"));
wxLinuxDistributionInfo ret;
id.StartsWith("Distributor ID:\t", &ret.Id);
desc.StartsWith("Description:\t", &ret.Description);
rel.StartsWith("Release:\t", &ret.Release);
codename.StartsWith("Codename:\t", &ret.CodeName);
return ret;
}
#endif
// these functions are in src/osx/utilsexc_base.cpp for wxMac
#ifndef __WXMAC__
wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
{
// get OS version
int major, minor;
wxString release = wxGetCommandOutput(wxT("uname -r"));
if ( release.empty() ||
wxSscanf(release.c_str(), wxT("%d.%d"), &major, &minor) != 2 )
{
// failed to get version string or unrecognized format
major =
minor = -1;
}
if ( verMaj )
*verMaj = major;
if ( verMin )
*verMin = minor;
// try to understand which OS are we running
wxString kernel = wxGetCommandOutput(wxT("uname -s"));
if ( kernel.empty() )
kernel = wxGetCommandOutput(wxT("uname -o"));
if ( kernel.empty() )
return wxOS_UNKNOWN;
return wxPlatformInfo::GetOperatingSystemId(kernel);
}
wxString wxGetOsDescription()
{
return wxGetCommandOutput(wxT("uname -s -r -m"));
}
#endif // !__WXMAC__
unsigned long wxGetProcessId()
{
return (unsigned long)getpid();
}
wxMemorySize wxGetFreeMemory()
{
#if defined(__LINUX__)
// get it from /proc/meminfo
FILE *fp = fopen("/proc/meminfo", "r");
if ( fp )
{
long memFree = -1;
char buf[1024];
if ( fgets(buf, WXSIZEOF(buf), fp) && fgets(buf, WXSIZEOF(buf), fp) )
{
// /proc/meminfo changed its format in kernel 2.6
if ( wxPlatformInfo().CheckOSVersion(2, 6) )
{
unsigned long cached, buffers;
sscanf(buf, "MemFree: %ld", &memFree);
fgets(buf, WXSIZEOF(buf), fp);
sscanf(buf, "Buffers: %lu", &buffers);
fgets(buf, WXSIZEOF(buf), fp);
sscanf(buf, "Cached: %lu", &cached);
// add to "MemFree" also the "Buffers" and "Cached" values as
// free(1) does as otherwise the value never makes sense: for
// kernel 2.6 it's always almost 0
memFree += buffers + cached;
// values here are always expressed in kB and we want bytes
memFree *= 1024;
}
else // Linux 2.4 (or < 2.6, anyhow)
{
long memTotal, memUsed;
sscanf(buf, "Mem: %ld %ld %ld", &memTotal, &memUsed, &memFree);
}
}
fclose(fp);
return (wxMemorySize)memFree;
}
#elif defined(__SGI__)
struct rminfo realmem;
if ( sysmp(MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0 )
return ((wxMemorySize)realmem.physmem * sysconf(_SC_PAGESIZE));
#elif defined(_SC_AVPHYS_PAGES)
return ((wxMemorySize)sysconf(_SC_AVPHYS_PAGES))*sysconf(_SC_PAGESIZE);
//#elif defined(__FREEBSD__) -- might use sysctl() to find it out, probably
#endif
// can't find it out
return -1;
}
bool wxGetDiskSpace(const wxString& path, wxDiskspaceSize_t *pTotal, wxDiskspaceSize_t *pFree)
{
#if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
// the case to "char *" is needed for AIX 4.3
wxStatfs_t fs;
if ( wxStatfs((char *)(const char*)path.fn_str(), &fs) != 0 )
{
wxLogSysError( wxT("Failed to get file system statistics") );
return false;
}
// under Solaris we also have to use f_frsize field instead of f_bsize
// which is in general a multiple of f_frsize
#ifdef HAVE_STATVFS
wxDiskspaceSize_t blockSize = fs.f_frsize;
#else // HAVE_STATFS
wxDiskspaceSize_t blockSize = fs.f_bsize;
#endif // HAVE_STATVFS/HAVE_STATFS
if ( pTotal )
{
*pTotal = wxDiskspaceSize_t(fs.f_blocks) * blockSize;
}
if ( pFree )
{
*pFree = wxDiskspaceSize_t(fs.f_bavail) * blockSize;
}
return true;
#else // !HAVE_STATFS && !HAVE_STATVFS
return false;
#endif // HAVE_STATFS
}
// ----------------------------------------------------------------------------
// env vars
// ----------------------------------------------------------------------------
#if USE_PUTENV
WX_DECLARE_STRING_HASH_MAP(char *, wxEnvVars);
static wxEnvVars gs_envVars;
class wxSetEnvModule : public wxModule
{
public:
virtual bool OnInit() { return true; }
virtual void OnExit()
{
for ( wxEnvVars::const_iterator i = gs_envVars.begin();
i != gs_envVars.end();
++i )
{
free(i->second);
}
gs_envVars.clear();
}
DECLARE_DYNAMIC_CLASS(wxSetEnvModule)
};
IMPLEMENT_DYNAMIC_CLASS(wxSetEnvModule, wxModule)
#endif // USE_PUTENV
bool wxGetEnv(const wxString& var, wxString *value)
{
// wxGetenv is defined as getenv()
char *p = wxGetenv(var);
if ( !p )
return false;
if ( value )
{
*value = p;
}
return true;
}
static bool wxDoSetEnv(const wxString& variable, const char *value)
{
#if defined(HAVE_SETENV)
if ( !value )
{
#ifdef HAVE_UNSETENV
// don't test unsetenv() return value: it's void on some systems (at
// least Darwin)
unsetenv(variable.mb_str());
return true;
#else
value = ""; // we can't pass NULL to setenv()
#endif
}
return setenv(variable.mb_str(), value, 1 /* overwrite */) == 0;
#elif defined(HAVE_PUTENV)
wxString s = variable;
if ( value )
s << wxT('=') << value;
// transform to ANSI
const wxWX2MBbuf p = s.mb_str();
char *buf = (char *)malloc(strlen(p) + 1);
strcpy(buf, p);
// store the string to free() it later
wxEnvVars::iterator i = gs_envVars.find(variable);
if ( i != gs_envVars.end() )
{
free(i->second);
i->second = buf;
}
else // this variable hadn't been set before
{
gs_envVars[variable] = buf;
}
return putenv(buf) == 0;
#else // no way to set an env var
return false;
#endif
}
bool wxSetEnv(const wxString& variable, const wxString& value)
{
return wxDoSetEnv(variable, value.mb_str());
}
bool wxUnsetEnv(const wxString& variable)
{
return wxDoSetEnv(variable, NULL);
}
// ----------------------------------------------------------------------------
// signal handling
// ----------------------------------------------------------------------------
#if wxUSE_ON_FATAL_EXCEPTION
#include <signal.h>
extern "C" void wxFatalSignalHandler(wxTYPE_SA_HANDLER)
{
if ( wxTheApp )
{
// give the user a chance to do something special about this
wxTheApp->OnFatalException();
}
abort();
}
bool wxHandleFatalExceptions(bool doit)
{
// old sig handlers
static bool s_savedHandlers = false;
static struct sigaction s_handlerFPE,
s_handlerILL,
s_handlerBUS,
s_handlerSEGV;
bool ok = true;
if ( doit && !s_savedHandlers )
{
// install the signal handler
struct sigaction act;
// some systems extend it with non std fields, so zero everything
memset(&act, 0, sizeof(act));
act.sa_handler = wxFatalSignalHandler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
ok &= sigaction(SIGFPE, &act, &s_handlerFPE) == 0;
ok &= sigaction(SIGILL, &act, &s_handlerILL) == 0;
ok &= sigaction(SIGBUS, &act, &s_handlerBUS) == 0;
ok &= sigaction(SIGSEGV, &act, &s_handlerSEGV) == 0;
if ( !ok )
{
wxLogDebug(wxT("Failed to install our signal handler."));
}
s_savedHandlers = true;
}
else if ( s_savedHandlers )
{
// uninstall the signal handler
ok &= sigaction(SIGFPE, &s_handlerFPE, NULL) == 0;
ok &= sigaction(SIGILL, &s_handlerILL, NULL) == 0;
ok &= sigaction(SIGBUS, &s_handlerBUS, NULL) == 0;
ok &= sigaction(SIGSEGV, &s_handlerSEGV, NULL) == 0;
if ( !ok )
{
wxLogDebug(wxT("Failed to uninstall our signal handler."));
}
s_savedHandlers = false;
}
//else: nothing to do
return ok;
}
#endif // wxUSE_ON_FATAL_EXCEPTION
// ----------------------------------------------------------------------------
// wxExecute support
// ----------------------------------------------------------------------------
int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
{
// define a custom handler processing only the closure of the descriptor
struct wxEndProcessFDIOHandler : public wxFDIOHandler
{
wxEndProcessFDIOHandler(wxEndProcessData *data, int fd)
: m_data(data), m_fd(fd)
{
}
virtual void OnReadWaiting()
{
wxFDIODispatcher::Get()->UnregisterFD(m_fd);
close(m_fd);
wxHandleProcessTermination(m_data);
delete this;
}
virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
wxEndProcessData * const m_data;
const int m_fd;
};
wxFDIODispatcher::Get()->RegisterFD
(
fd,
new wxEndProcessFDIOHandler(data, fd),
wxFDIO_INPUT
);
return fd; // unused, but return something unique for the tag
}
bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
{
#if HAS_PIPE_INPUT_STREAM
bool hasIO = false;
if ( execData.bufOut && execData.bufOut->Update() )
hasIO = true;
if ( execData.bufErr && execData.bufErr->Update() )
hasIO = true;
return hasIO;
#else // !HAS_PIPE_INPUT_STREAM
return false;
#endif // HAS_PIPE_INPUT_STREAM/!HAS_PIPE_INPUT_STREAM
}
// helper classes/functions used by WaitForChild()
namespace
{
// convenient base class for IO handlers which are registered for read
// notifications only and which also stores the FD we're reading from
//
// the derived classes still have to implement OnReadWaiting()
class wxReadFDIOHandler : public wxFDIOHandler
{
public:
wxReadFDIOHandler(wxFDIODispatcher& disp, int fd) : m_fd(fd)
{
if ( fd )
disp.RegisterFD(fd, this, wxFDIO_INPUT);
}
virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
protected:
const int m_fd;
wxDECLARE_NO_COPY_CLASS(wxReadFDIOHandler);
};
// class for monitoring our end of the process detection pipe, simply sets a
// flag when input on the pipe (which must be due to EOF) is detected
class wxEndHandler : public wxReadFDIOHandler
{
public:
wxEndHandler(wxFDIODispatcher& disp, int fd)
: wxReadFDIOHandler(disp, fd)
{
m_terminated = false;
}
bool Terminated() const { return m_terminated; }
virtual void OnReadWaiting() { m_terminated = true; }
private:
bool m_terminated;
wxDECLARE_NO_COPY_CLASS(wxEndHandler);
};
#if HAS_PIPE_INPUT_STREAM
// class for monitoring our ends of child stdout/err, should be constructed
// with the FD and stream from wxExecuteData and will do nothing if they're
// invalid
//
// unlike wxEndHandler this class registers itself with the provided dispatcher
class wxRedirectedIOHandler : public wxReadFDIOHandler
{
public:
wxRedirectedIOHandler(wxFDIODispatcher& disp,
int fd,
wxStreamTempInputBuffer *buf)
: wxReadFDIOHandler(disp, fd),
m_buf(buf)
{
}
virtual void OnReadWaiting()
{
m_buf->Update();
}
private:
wxStreamTempInputBuffer * const m_buf;
wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler);
};
#endif // HAS_PIPE_INPUT_STREAM
// helper function which calls waitpid() and analyzes the result
int DoWaitForChild(int pid, int flags = 0)
{
wxASSERT_MSG( pid > 0, "invalid PID" );
int status, rc;
// loop while we're getting EINTR
for ( ;; )
{
rc = waitpid(pid, &status, flags);
if ( rc != -1 || errno != EINTR )
break;
}
if ( rc == 0 )
{
// This can only happen if the child application closes our dummy pipe
// that is used to monitor its lifetime; in that case, our best bet is
// to pretend the process did terminate, because otherwise wxExecute()
// would hang indefinitely (OnReadWaiting() won't be called again, the
// descriptor is closed now).
wxLogDebug("Child process (PID %d) still alive but pipe closed so "
"generating a close notification", pid);
}
else if ( rc == -1 )
{
wxLogLastError(wxString::Format("waitpid(%d)", pid));
}
else // child did terminate
{
wxASSERT_MSG( rc == pid, "unexpected waitpid() return value" );
if ( WIFEXITED(status) )
return WEXITSTATUS(status);
else if ( WIFSIGNALED(status) )
return -WTERMSIG(status);
else
{
wxLogError("Child process (PID %d) exited for unknown reason, "
"status = %d", pid, status);
}
}
return -1;
}
} // anonymous namespace
int wxAppTraits::WaitForChild(wxExecuteData& execData)
{
if ( !(execData.flags & wxEXEC_SYNC) )
{
// asynchronous execution: just launch the process and return,
// endProcData will be destroyed when it terminates (currently we leak
// it if the process doesn't terminate before we do and this should be
// fixed but it's not a real leak so it's not really very high
// priority)
wxEndProcessData *endProcData = new wxEndProcessData;
endProcData->process = execData.process;
endProcData->pid = execData.pid;
endProcData->tag = AddProcessCallback
(
endProcData,
execData.GetEndProcReadFD()
);
endProcData->async = true;
return execData.pid;
}
//else: synchronous execution case
#if HAS_PIPE_INPUT_STREAM && wxUSE_SOCKETS
wxProcess * const process = execData.process;
if ( process && process->IsRedirected() )
{
// we can't simply block waiting for the child to terminate as we would
// dead lock if it writes more than the pipe buffer size (typically
// 4KB) bytes of output -- it would then block waiting for us to read
// the data while we'd block waiting for it to terminate
//
// so multiplex here waiting for any input from the child or closure of
// the pipe used to indicate its termination
wxSelectDispatcher disp;
wxEndHandler endHandler(disp, execData.GetEndProcReadFD());
wxRedirectedIOHandler outHandler(disp, execData.fdOut, execData.bufOut),
errHandler(disp, execData.fdErr, execData.bufErr);
while ( !endHandler.Terminated() )
{
disp.Dispatch();
}
}
//else: no IO redirection, just block waiting for the child to exit
#endif // HAS_PIPE_INPUT_STREAM
return DoWaitForChild(execData.pid);
}
void wxHandleProcessTermination(wxEndProcessData *data)
{
data->exitcode = DoWaitForChild(data->pid, WNOHANG);
// notify user about termination if required
if ( data->process )
{
data->process->OnTerminate(data->pid, data->exitcode);
}
if ( data->async )
{
// in case of asynchronous execution we don't need this data any more
// after the child terminates
delete data;
}
else // sync execution
{
// let wxExecute() know that the process has terminated
data->pid = 0;
}
}
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