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Exclusively lock save file 

Prevents two instances of catgirl from using the same save file and
clobbering each other's data.
master
C. McEnroe 2021-06-11 21:09:46 -04:00
parent c6009cf13c
commit f6e8078c46
1 changed files with 6 additions and 0 deletions
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6
ui.c
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@ -32,6 +32,7 @@
#include <curses.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
@ -1183,6 +1184,11 @@ void uiLoad(const char *name) {
if (!saveFile) exit(EX_CANTCREAT);
rewind(saveFile);
int error = flock(fileno(saveFile), LOCK_EX | LOCK_NB);
if (error && errno == EWOULDBLOCK) {
errx(EX_CANTCREAT, "%s: save file in use", name);
}
time_t signature;
fread(&signature, sizeof(signature), 1, saveFile);
if (ferror(saveFile)) err(EX_IOERR, "fread");