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/*
* write_login_utmpx — write a LOGIN_PROCESS utmpx entry for a target PID.
*
* Usage: write_login_utmpx <ut_id> <ut_line> <ut_pid>
*
* Background: illumos `login(1)` walks utmpx and requires an entry whose
* ut_pid matches login's own PID. ttymon updates an existing entry via
* pututxline() — it does NOT create one. Standard illumos init writes
* INIT_PROCESS entries when spawning getty/ttymon from inittab; zyginit
* doesn't, so ttymon has nothing to update and login eventually errors
* out with "No utmpx entry. You must exec login from the lowest level
* shell."
*
* This helper writes a LOGIN_PROCESS entry for a target PID and exits.
* Called from console-login/start.sh just before `exec ttymon`, with
* $$ (the wrapper script's PID, which becomes ttymon's PID after exec)
* as the third argument.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <utmpx.h>
int
main(int argc, char **argv)
{
struct utmpx ux;
pid_t target_pid;
if (argc < 4) {
(void) fprintf(stderr,
"Usage: %s <ut_id> <ut_line> <ut_pid>\n", argv[0]);
return (1);
}
target_pid = (pid_t)atoi(argv[3]);
(void) memset(&ux, 0, sizeof (ux));
(void) strncpy(ux.ut_id, argv[1], sizeof (ux.ut_id));
(void) strncpy(ux.ut_line, argv[2], sizeof (ux.ut_line));
(void) strncpy(ux.ut_user, "LOGIN", sizeof (ux.ut_user));
ux.ut_pid = target_pid;
ux.ut_type = LOGIN_PROCESS;
(void) time(&ux.ut_tv.tv_sec);
setutxent();
if (pututxline(&ux) == NULL) {
(void) fprintf(stderr, "%s: pututxline failed\n", argv[0]);
endutxent();
return (1);
}
endutxent();
return (0);
}
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