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#include <sys/stat.h>
#include "sysinfo_defs.h"
#include "boottime_defs.h"
#if !defined(HAVE_SYSTEM_SYSINFO) && !defined(HAVE_SYSTEM_BOOTTIME)
int check_first(char *lock, struct stat *st) { return 0; }
#else
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
extern int get_uptime(time_t *t);
int check_first(char *lock, struct stat *st) /*EXTRACT_INCL*/{
int k;
/* If a stat error other than "no such file" occurs, I don't
know what went wrong, so I'll proceed with caution by
denying the autologin request. */
if ((k=stat(lock, st)) && errno != ENOENT)
return 0;
if (k==0) {
time_t uptime;
if (get_uptime(&uptime))
return 0;
/* If there's been an autologin granted since the last boot,
deny this and any subsequent attempts. Note that this test
is skipped if the LOCK file doesn't exist. */
if (time(0) - uptime < st->st_mtime)
return 0;
}
/* Create the LOCK file. The mtime of this file provides
a persistent record of the last time that an autologin
request was granted. Deny the autologin request if either
the file open or file close fails. */
if ((k=open(lock, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0 || close(k))
return 0;
/* All tests are okay, so grant the autologin request. */
return 1;
}
#endif
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