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0. wxExecute() with IO redirection now works again (but the real fix is

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in wxInputStream::Ungetch(), not here)
1. replaced multitude of pipe() calls &c with wxPipe class
2. fixed nasty bug in wxStreamTempBuffer::Update() which corrupted the data
3. increased buffer size to 4Kb from 1Kb


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16146 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2002-07-12 14:44:11 +00:00
parent aacb1b8018
commit b477f956e0
1 changed files with 141 additions and 62 deletions
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197
src/unix/utilsunx.cpp
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@@ -465,7 +465,7 @@ size_t wxProcessFileOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
command we set up a pipe with a valid file descriptor on the reading side
when the output is redirected. So the subprocess happily writes to it ...
until the pipe buffer (which is usually quite big on Unix, I think the
default is 4Mb) is full. Then the writing process stops and waits until we
default is 4Kb) is full. Then the writing process stops and waits until we
read some data from the pipe to be able to continue writing to it but we
never do it because we wait until it terminates to start reading and so we
have a classical deadlock.
@@ -474,6 +474,10 @@ size_t wxProcessFileOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
buffer (wxStreamTempBuffer object) and later just stuff it back into the
stream when the process terminates. See supporting code in wxExecute()
itself as well.
Note that this is horribly inefficient for large amounts of output (count
the number of times we copy the data around) and so a better API is badly
needed!
*/
class wxStreamTempBuffer
@@ -517,9 +521,9 @@ void wxStreamTempBuffer::Update()
{
if ( m_stream && !m_stream->Eof() )
{
// realloc in blocks of 1Kb - surely not the best strategy but which
// one is?
static const size_t incSize = 1024;
// realloc in blocks of 4Kb: this is the default (and minimal) buffer
// size of the Unix pipes so it should be the optimal step
static const size_t incSize = 4096;
void *buf = realloc(m_buffer, m_size + incSize);
if ( !buf )
@@ -531,7 +535,7 @@ void wxStreamTempBuffer::Update()
{
m_buffer = buf;
m_stream->Read((char *)m_buffer + m_size, incSize);
m_size += incSize;
m_size += m_stream->LastRead();
}
}
}
@@ -547,6 +551,87 @@ wxStreamTempBuffer::~wxStreamTempBuffer()
#endif // wxUSE_STREAMS
// ----------------------------------------------------------------------------
// wxPipe: this encpasulates pipe() system call
// ----------------------------------------------------------------------------
class wxPipe
{
public:
// the symbolic names for the pipe ends
enum Direction
{
Read,
Write
};
enum
{
INVALID_FD = -1
};
// default ctor doesn't do anything
wxPipe() { m_fds[Read] = m_fds[Write] = INVALID_FD; }
// create the pipe, return TRUE if ok, FALSE on error
bool Create()
{
if ( pipe(m_fds) == -1 )
{
wxLogSysError(_("Pipe creation failed"));
return FALSE;
}
return TRUE;
}
// return TRUE if we were created successfully
bool IsOk() const { return m_fds[Read] != INVALID_FD; }
// return the descriptor for one of the pipe ends
int operator[](Direction which) const
{
wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
_T("invalid pipe index") );
return m_fds[which];
}
// detach a descriptor, meaning that the pipe dtor won't close it, and
// return it
int Detach(Direction which)
{
wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
_T("invalid pipe index") );
int fd = m_fds[which];
m_fds[which] = INVALID_FD;
return fd;
}
// close the pipe descriptors
void Close()
{
for ( size_t n = 0; n < WXSIZEOF(m_fds); n++ )
{
if ( m_fds[n] != INVALID_FD )
close(m_fds[n]);
}
}
// dtor closes the pipe descriptors
~wxPipe() { Close(); }
private:
int m_fds[2];
};
// ----------------------------------------------------------------------------
// wxExecute: the real worker function
// ----------------------------------------------------------------------------
long wxExecute(wxChar **argv,
int flags,
wxProcess *process)
@@ -585,10 +670,9 @@ long wxExecute(wxChar **argv,
#if wxUSE_GUI
// create pipes
int end_proc_detect[2];
if ( pipe(end_proc_detect) == -1 )
wxPipe pipeEndProcDetect;
if ( !pipeEndProcDetect.Create() )
{
wxLogSysError( _("Pipe creation failed") );
wxLogError( _("Failed to execute '%s'\n"), *argv );
ARGS_CLEANUP;
@@ -598,25 +682,14 @@ long wxExecute(wxChar **argv,
#endif // wxUSE_GUI
// pipes for inter process communication
int pipeIn[2], // stdin
pipeOut[2], // stdout
pipeErr[2]; // stderr
pipeIn[0] = pipeIn[1] =
pipeOut[0] = pipeOut[1] =
pipeErr[0] = pipeErr[1] = -1;
wxPipe pipeIn, // stdin
pipeOut, // stdout
pipeErr; // stderr
if ( process && process->IsRedirected() )
{
if ( pipe(pipeIn) == -1 || pipe(pipeOut) == -1 || pipe(pipeErr) == -1 )
if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
{
#if wxUSE_GUI
// free previously allocated resources
close(end_proc_detect[0]);
close(end_proc_detect[1]);
#endif // wxUSE_GUI
wxLogSysError( _("Pipe creation failed") );
wxLogError( _("Failed to execute '%s'\n"), *argv );
ARGS_CLEANUP;
@@ -634,17 +707,6 @@ long wxExecute(wxChar **argv,
if ( pid == -1 ) // error?
{
#if wxUSE_GUI
close(end_proc_detect[0]);
close(end_proc_detect[1]);
close(pipeIn[0]);
close(pipeIn[1]);
close(pipeOut[0]);
close(pipeOut[1]);
close(pipeErr[0]);
close(pipeErr[1]);
#endif // wxUSE_GUI
wxLogSysError( _("Fork failed") );
ARGS_CLEANUP;
@@ -654,7 +716,9 @@ long wxExecute(wxChar **argv,
else if ( pid == 0 ) // we're in child
{
#if wxUSE_GUI
close(end_proc_detect[0]); // close reading side
// reading side can be safely closed but we should keep the write one
// opened
pipeEndProcDetect.Detach(wxPipe::Write);
#endif // wxUSE_GUI
// These lines close the open file descriptors to to avoid any
@@ -665,9 +729,11 @@ long wxExecute(wxChar **argv,
{
for ( int fd = 0; fd < FD_SETSIZE; fd++ )
{
if ( fd == pipeIn[0] || fd == pipeOut[1] || fd == pipeErr[1]
if ( fd == pipeIn[wxPipe::Read]
|| fd == pipeOut[wxPipe::Write]
|| fd == pipeErr[wxPipe::Write]
#if wxUSE_GUI
|| fd == end_proc_detect[1]
|| fd == pipeEndProcDetect[wxPipe::Write]
#endif // wxUSE_GUI
)
{
@@ -675,7 +741,7 @@ long wxExecute(wxChar **argv,
continue;
}
// leave stderr opened too, it won't do any hurm
// leave stderr opened too, it won't do any harm
if ( fd != STDERR_FILENO )
close(fd);
}
@@ -687,22 +753,22 @@ long wxExecute(wxChar **argv,
// of the parent will kill the process and all of its children.
setsid();
}
#endif
#endif // !__VMS
}
// redirect stdio, stdout and stderr
if ( pipeIn[0] != -1 )
if ( pipeIn.IsOk() )
{
if ( dup2(pipeIn[0], STDIN_FILENO) == -1 ||
dup2(pipeOut[1], STDOUT_FILENO) == -1 ||
dup2(pipeErr[1], STDERR_FILENO) == -1 )
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"));
}
close(pipeIn[0]);
close(pipeOut[1]);
close(pipeErr[1]);
pipeIn.Close();
pipeOut.Close();
pipeErr.Close();
}
execvp (*mb_argv, mb_argv);
@@ -713,6 +779,9 @@ long wxExecute(wxChar **argv,
// 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
@@ -730,24 +799,40 @@ long wxExecute(wxChar **argv,
{
#if wxUSE_STREAMS
// in/out for subprocess correspond to our out/in
wxOutputStream *outStream = new wxProcessFileOutputStream(pipeIn[1]);
wxInputStream *inStream = new wxProcessFileInputStream(pipeOut[0]);
wxInputStream *errStream = new wxProcessFileInputStream(pipeErr[0]);
wxOutputStream *outStream =
new wxProcessFileOutputStream(pipeIn.Detach(wxPipe::Write));
wxInputStream *inStream =
new wxProcessFileInputStream(pipeOut.Detach(wxPipe::Read));
wxInputStream *errStream =
new wxProcessFileInputStream(pipeErr.Detach(wxPipe::Read));
process->SetPipeStreams(inStream, outStream, errStream);
bufIn.Init(inStream);
bufErr.Init(inStream);
bufErr.Init(errStream);
#endif // wxUSE_STREAMS
}
close(pipeIn[0]); // close reading side
close(pipeOut[1]); // close writing side
close(pipeErr[1]); // close writing side
if ( pipeIn.IsOk() )
{
pipeIn.Close();
pipeOut.Close();
pipeErr.Close();
}
#if wxUSE_GUI && !defined(__WXMICROWIN__)
wxEndProcessData *data = new wxEndProcessData;
data->tag = wxAddProcessCallback
(
data,
pipeEndProcDetect.Detach(wxPipe::Read)
);
pipeEndProcDetect.Close();
if ( flags & wxEXEC_SYNC )
{
// we may have process for capturing the program output, but it's
@@ -756,9 +841,6 @@ long wxExecute(wxChar **argv,
// sync execution: indicate it by negating the pid
data->pid = -pid;
data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
close(end_proc_detect[1]); // close writing side
wxBusyCursor bc;
wxWindowDisabler wd;
@@ -790,9 +872,6 @@ long wxExecute(wxChar **argv,
// will be deleted in GTK_EndProcessDetector
data->process = process;
data->pid = pid;
data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
close(end_proc_detect[1]); // close writing side
return pid;
}