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Implement file locking and apply to configure

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Functions for file locking are added. They are used for ensuring that
for specified userdir only one LyX process runs configure.
This commit is contained in:
Kornel Benko 2013-11-20 19:40:32 +01:00
parent ca546a8b7e
commit 805e51eff8
5 changed files with 35 additions and 4 deletions
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2
configure.ac
View File

@ -174,7 +174,7 @@ fi
LYX_CHECK_DEF(PATH_MAX, limits.h, [int n = PATH_MAX;])
AC_CHECK_FUNCS(chmod close _close fork getpid _getpid lstat mkfifo open _open pclose _pclose popen _popen readlink putenv setenv strerror unsetenv)
AC_CHECK_FUNCS(chmod close _close fork getpid _getpid lockf lstat mkfifo open _open pclose _pclose popen _popen readlink putenv setenv strerror unsetenv)
# Check the form of mkdir()
AC_FUNC_MKDIR
AC_FUNC_SELECT_ARGTYPES

2
development/cmake/ConfigureChecks.cmake
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@ -40,7 +40,7 @@ configure_file(${TOP_BINARY_DIR}/configIncludes.h.cmake ${TOP_BINARY_DIR}/config
set(Function_Defines)
foreach(_f alloca __argz_count __argz_next __argz_stringify
chmod close _close dcgettext fcntl fork __fsetlocking
getcwd getegid getgid getpid _getpid gettext getuid lstat mempcpy mkdir _mkdir
getcwd getegid getgid getpid _getpid gettext getuid lstat lockf mempcpy mkdir _mkdir
mkfifo open _open pclose _pclose popen _popen putenv readlink
setenv setlocale strcasecmp stpcpy strdup strerror strtoul tsearch unsetenv wcslen)
string(TOUPPER ${_f} _UF)

9
src/LyX.cpp
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@ -754,8 +754,15 @@ bool LyX::init()
prependEnvPath("PATH", replaceEnvironmentPath(lyxrc.path_prefix));
// Check that user LyX directory is ok.
if (queryUserLyXDir(package().explicit_user_support()))
{
string const lock_file = package().user_support().absFileName() + ".lyx_configure_lock";
int fd = fileLock(lock_file.c_str());
if (queryUserLyXDir(package().explicit_user_support())) {
reconfigureUserLyXDir();
}
fileUnlock(fd, lock_file.c_str());
}
if (!use_gui) {
// No need for a splash when there is no GUI

22
src/support/filetools.cpp
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@ -1064,6 +1064,28 @@ bool prefs2prefs(FileName const & filename, FileName const & tempfile, bool lfun
return true;
}
int fileLock(const char * lock_file)
{
int fd = -1;
#if defined(HAVE_LOCKF)
fd = open(lock_file, O_CREAT|O_APPEND|O_SYNC|O_RDWR, 0666);
if (lockf(fd, F_LOCK, 0) != 0) {
close(fd);
return(-1);
}
#endif
return(fd);
}
void fileUnlock(int fd, const char * lock_file)
{
#if defined(HAVE_LOCKF)
if ( fd >= 0) {
(void) lockf(fd, F_ULOCK, 0);
close(fd);
}
#endif
}
} //namespace support
} // namespace lyx

2
src/support/filetools.h
View File

@ -292,6 +292,8 @@ typedef std::pair<int, std::string> cmd_ret;
cmd_ret const runCommand(std::string const & cmd);
int fileLock(const char * lock_file);
void fileUnlock(int fd, const char * lock_file);
} // namespace support
} // namespace lyx