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Clear utmp entries for the specified tty in getty(8)

This commit is contained in:
sin 2014-07-02 11:45:10 +01:00
parent 8d187be64a
commit ae8ca1598b
1 changed files with 27 additions and 2 deletions
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29
getty.c
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@ -10,6 +10,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include "util.h"
@ -25,12 +26,15 @@ static char *defaultterm = "linux";
int
main(int argc, char *argv[])
{
int fd;
struct sigaction sa;
char term[128], logname[LOGIN_NAME_MAX], c;
char hostname[HOST_NAME_MAX + 1];
struct utmp usr;
struct sigaction sa;
FILE *fp;
int fd;
unsigned int i = 0;
ssize_t n;
long pos;
ARGBEGIN {
default:
@ -84,6 +88,27 @@ main(int argc, char *argv[])
if (fchmod(fd, 0600) < 0)
eprintf("chmod %s:", tty);
/* Clear all utmp entries for this tty */
fp = fopen("/var/run/utmp", "r+");
if (fp) {
do {
pos = ftell(fp);
if (fread(&usr, sizeof(usr), 1, fp) != 1)
break;
if (usr.ut_line[0] == '\0')
continue;
if (strcmp(usr.ut_line, tty) != 0)
continue;
memset(&usr, 0, sizeof(usr));
fseek(fp, pos, SEEK_SET);
if (fwrite(&usr, sizeof(usr), 1, fp) != 1)
break;
} while (1);
if (ferror(fp))
weprintf("%s: I/O error:", "/var/run/utmp");
fclose(fp);
}
if (argc > 2)
return execvp(argv[2], argv + 2);