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Angus' fix to make pclose work again:

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block SIGCHLD during popen/pclose.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8596 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Jürgen Spitzmüller 2004-04-05 06:46:22 +00:00
parent fd80d9ff4e
commit 971a9ac4e3
2 changed files with 27 additions and 1 deletions
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5
src/support/ChangeLog
View File

@ -1,3 +1,8 @@
2004-04-05 Jürgen Spitzmüller <j.spitzmueller@gmx.de>
* filetools.C (RunCommand): block SIGCHLD during popen/pclose
(actually Angus' fix).
2004-04-01 Georg Baum <Georg.Baum@post.rwth-aachen.de>
* filetools.C (DeleteAllFilesInDir): delete directories with

23
src/support/filetools.C
View File

@ -28,6 +28,7 @@
#include "filetools.h"
#include "lstrings.h"
#include "FileInfo.h"
#include "forkedcontr.h"
#include "path.h"
#include "path_defines.h"
#include "gettext.h"
@ -1172,17 +1173,31 @@ bool LyXReadLink(string const & file, string & link, bool resolve)
cmd_ret const RunCommand(string const & cmd)
{
// FIXME: replace all calls to RunCommand with ForkedCall
// (if the output is not needed) or the code in ispell.C
// (if the output is needed).
// One question is if we should use popen or
// create our own popen based on fork, exec, pipe
// of course the best would be to have a
// pstream (process stream), with the
// variants ipstream, opstream
sigset_t newMask, oldMask;
sigemptyset(&oldMask);
sigemptyset(&newMask);
sigaddset(&newMask, SIGCHLD);
// Block the SIGCHLD signal.
sigprocmask(SIG_BLOCK, &newMask, &oldMask);
FILE * inf = ::popen(cmd.c_str(), os::popen_read_mode());
// (Claus Hentschel) Check if popen was succesful ;-)
if (!inf)
if (!inf) {
return make_pair(-1, string());
lyxerr << "RunCommand:: could not start child process" << endl;
}
string ret;
int c = fgetc(inf);
@ -1191,6 +1206,12 @@ cmd_ret const RunCommand(string const & cmd)
c = fgetc(inf);
}
int const pret = pclose(inf);
if (pret == -1)
perror("RunCommand:: could not terminate child process");
// Unblock the SIGCHLD signal and restore the old mask.
sigprocmask(SIG_SETMASK, &oldMask, 0);
return make_pair(pret, ret);
}