FILE *master_fopen(const char *name, const char *mode) {
FILE *f = am_master() ? fopen(name, mode) : 0;
/* other processes need to know if fopen returned zero, in order
to abort if fopen failed. If fopen was successfully, just return
a random non-zero pointer (which is never used except to compare to zero)
on non-master processes */
if (broadcast(0, bool(f != 0)) && !am_master())
f = (FILE *) name;
return f;
}
static bool is_ok_dir(const char *dirname) {
DIR *dir;
bool direxists = 0;
if (am_master()) {
direxists = (dir = opendir(dirname)) != NULL;
if (direxists) closedir(dir);
else mkdir(dirname, 00777);
}
direxists = broadcast(0, direxists);
return !direxists;
}
void master_fclose(FILE *f) {
if (am_master()) fclose(f);
}
void master_fprintf(FILE *f, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
if (am_master()) { vfprintf(f, fmt, ap); fflush(f); }
va_end(ap);
}
void trash_output_directory(const char *dirname) {
if (am_master()) mkdir(dirname, 00777);
}
