Added lockfile feature, to prevent multiple launches within 30 seconds
(due to over-clicking, for example).
This commit is contained in:
William Kendrick
parent
6752deb266
commit
00c5d44b96
5 changed files with 144 additions and 11 deletions
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@ -1,5 +1,5 @@
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.\" tuxpaint.1 - 2004.08.19
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.TH TUXPAINT 1 "19 Aug 2004" "0.9.14" "Tux Paint"
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.\" tuxpaint.1 - 2004.09.13
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.TH TUXPAINT 1 "13 Sep 2004" "0.9.14" "Tux Paint"
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.SH NAME
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tuxpaint -- A drawing program for young children.
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@ -65,7 +65,7 @@ tuxpaint -- A drawing program for young children.
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.TP 9
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.B tuxpaint
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[\-\-nosysconfig]
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[\-\-nosysconfig] [\-\-nolockfile]
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.SH DESCRIPTION
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.PP
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@ -403,6 +403,14 @@ Display a lists of all supported languages.
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With this option, \fITux Paint\fP will not attempt to read the
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system-wide configuration file (typically \fI/etc/tuxpaint/tuxpaint.conf\fP).
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.TP 8
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.B \-\-nolockfile
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By default, \fITux Paint\fP uses a lockfile (stored in the user's
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local Tux Paint directory) which prevents it from being launched more than
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once in 30 seconds. (Sometimes children get too eager, or user interfaces
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only require one click, but users think they need to double-click.)
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This option makes \fITux Paint\fP ignore the current lockfile.
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.SH ENVIRONMENT
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.l
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While \fITux Paint\fP may refer to a number of environment variables indirectly
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@ -435,7 +443,8 @@ User's configuration file. It can be used to set default options
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override any settings in the system-wide configuration file.
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.RS
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.PP
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(Not created or edited automatically; must be created manually.)
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(Not created or edited automatically; must be created manually.
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You can do this by hand, or use '\fITux Paint Config.\fP.')
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.RE
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.TP 8
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.B $HOME/.tuxpaint/saved/
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@ -455,6 +464,16 @@ is re-run.)
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.PP
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(Created when \fITux Paint\fP is \fIQuit\fP.)
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.RE
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.TP 8
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.B $HOME/.tuxpaint/lockfile.dat
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A lockfile that prevents \fITux Paint\fP from being launched more than once
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every 30 seconds. Disable checking the lockfile by using the
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'\-\-nolockfile' command-line argument.
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.RS
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.PP
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(There's no reason to delete the lockfile, as it contains a timestamp
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inside which causes it to expire after 30 seconds.)
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.RE
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.SH COPYRIGHT
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This program is free software; you can redistribute it and/or modify
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@ -21,12 +21,12 @@
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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June 14, 2002 - September 4, 2004
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June 14, 2002 - September 13, 2004
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*/
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#define VER_VERSION "0.9.14"
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#define VER_DATE "2004-09-04"
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#define VER_DATE "2004-09-13"
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/* #define DEBUG */
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@ -3746,7 +3746,7 @@ void show_usage(FILE * f, char * prg)
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#endif
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" %s [--printdelay=SECONDS]\n"
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" %s [--lang LANGUAGE | --locale LOCALE | --lang help]\n"
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" %s [--nosysconfig]\n"
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" %s [--nosysconfig] [--nolockfile]\n"
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/* " %s [--record FILE | --playback FILE]\n" */
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"\n",
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prg, prg,
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@ -3903,7 +3903,7 @@ const char *getfilename(const char* path)
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void setup(int argc, char * argv[])
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{
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int i, ok_to_use_sysconfig;
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int i, ok_to_use_sysconfig, ok_to_use_lockfile;
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char str[128];
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char * upstr;
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SDL_Color black = {0, 0, 0, 0};
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@ -3961,6 +3961,7 @@ void setup(int argc, char * argv[])
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playfile = NULL;
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recording = 0;
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playing = 0;
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ok_to_use_lockfile = 1;
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#ifdef __BEOS__
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@ -3979,6 +3980,7 @@ void setup(int argc, char * argv[])
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#endif
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/* Load options from global config file: */
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#ifndef WIN32
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@ -4370,6 +4372,11 @@ void setup(int argc, char * argv[])
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{
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debug("Not using system config.");
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}
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else if (strcmp(argv[i], "--nolockfile") == 0)
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{
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debug("Not using lockfile");
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ok_to_use_lockfile = 0;
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}
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else
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{
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show_usage(stderr, (char *) getfilename(argv[0]));
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@ -4690,6 +4697,66 @@ void setup(int argc, char * argv[])
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putenv("SDL_VIDEO_X11_WMCLASS=TuxPaint.TuxPaint");
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#endif
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/* Test for lockfile, if we're using one: */
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if (ok_to_use_lockfile)
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{
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char * lock_fname;
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FILE * fi;
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time_t time_lock, time_now;
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/* Get the current time: */
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time_now = time(NULL);
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/* Look for the lockfile... */
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lock_fname = get_fname("lockfile.dat");
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fi = fopen(lock_fname, "r");
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if (fi != NULL)
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{
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/* If it exists, read its contents: */
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if (fread(&time_lock, sizeof(time_t), 1, fi) > 0)
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{
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/* Has it not been 30 seconds yet? */
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if (time_now < time_lock + 30)
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{
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/* FIXME: Wrap in gettext() */
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printf("\nYou're already running a copy of Tux Paint!\n\n");
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fclose(fi);
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exit(0);
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}
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}
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fclose(fi);
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}
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/* Okay to run; create/update the lockfile */
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fi = fopen(lock_fname, "w");
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if (fi != NULL)
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{
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/* If we can write to it, do so! */
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fwrite(&time_now, sizeof(time_t), 1, fi);
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fclose(fi);
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}
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else
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{
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fprintf(stderr,
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"\nWarning: I couldn't create the lockfile (%s)\n"
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"The error that occurred was:\n"
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"%s\n\n", lock_fname, strerror(errno));
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}
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}
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/* Init SDL Video: */
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