mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-16 06:52:27 +00:00
Fixed a bug that caused last(1) to be extremely slow in some cases, and
made other performance improving changes. This improves the performance of last(1) by as much as 32 times in some cases, and in more typical cases is about twice as fast. Added a BUGS section to the manual page to describe the behavior of last(1) when a login shell terminates abnormally (and thus doesn't write a logout record to the wtmp file).
This commit is contained in:
David Greenman
parent
9123d7efcf
commit
c83d3f4574
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=11547
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@ -117,6 +117,11 @@ login data base
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.Xr lastcomm 1 ,
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.Xr utmp 5 ,
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.Xr ac 8
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.Sh BUGS
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If a login shell should terminate abnormally for some reason, it is likely
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that a logout record won't be written to the wtmp file. In this case,
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.Nm last
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will indicate the logout time as "shutdown".
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.Sh HISTORY
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.Nm Last
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appeared in
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@ -54,6 +54,7 @@ static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/queue.h>
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#define NO 0 /* false/no */
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#define YES 1 /* true/yes */
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@ -70,23 +71,23 @@ typedef struct arg {
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} ARG;
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ARG *arglist; /* head of linked list */
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typedef struct ttytab {
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LIST_HEAD(ttylisthead, ttytab) ttylist;
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struct ttytab {
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long logout; /* log out time */
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char tty[UT_LINESIZE + 1]; /* terminal name */
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struct ttytab *next; /* linked list pointer */
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} TTY;
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TTY *ttylist; /* head of linked list */
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LIST_ENTRY(ttytab) list;
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};
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static long currentout, /* current logout value */
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maxrec; /* records to display */
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static char *file = _PATH_WTMP; /* wtmp file */
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void addarg __P((int, char *));
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TTY *addtty __P((char *));
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void hostconv __P((char *));
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void onintr __P((int));
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char *ttyconv __P((char *));
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int want __P((struct utmp *, int));
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int want __P((struct utmp *));
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void wtmp __P((void));
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int
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@ -158,12 +159,14 @@ void
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wtmp()
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{
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struct utmp *bp; /* current structure */
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TTY *T; /* tty list entry */
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struct ttytab *tt; /* ttylist entry */
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struct stat stb; /* stat of file for size */
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long bl, delta; /* time difference */
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int bytes, wfd;
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char *ct, *crmsg;
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LIST_INIT(&ttylist);
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if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
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err(1, "%s", file);
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bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
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@ -183,14 +186,16 @@ wtmp()
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*/
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if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
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/* everybody just logged out */
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for (T = ttylist; T; T = T->next)
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T->logout = -bp->ut_time;
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for (tt = ttylist.lh_first; tt; tt = tt->list.le_next) {
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LIST_REMOVE(tt, list);
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free(tt);
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}
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currentout = -bp->ut_time;
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crmsg = strncmp(bp->ut_name, "shutdown",
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UT_NAMESIZE) ? "crash" : "shutdown";
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if (want(bp, NO)) {
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if (want(bp)) {
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ct = ctime(&bp->ut_time);
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
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UT_NAMESIZE, UT_NAMESIZE,
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bp->ut_name, UT_LINESIZE,
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UT_LINESIZE, bp->ut_line,
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@ -207,58 +212,77 @@ wtmp()
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*/
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if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
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&& !bp->ut_line[1]) {
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if (want(bp, NO)) {
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if (want(bp)) {
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ct = ctime(&bp->ut_time);
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
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UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
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UT_LINESIZE, UT_LINESIZE, bp->ut_line,
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UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
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ct, ct + 11);
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
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UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
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UT_LINESIZE, UT_LINESIZE, bp->ut_line,
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UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
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ct, ct + 11);
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if (maxrec && !--maxrec)
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return;
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}
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continue;
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}
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/* find associated tty */
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for (T = ttylist;; T = T->next) {
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if (!T) {
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/* add new one */
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T = addtty(bp->ut_line);
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break;
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}
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if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
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break;
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}
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if (bp->ut_name[0] && want(bp, YES)) {
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ct = ctime(&bp->ut_time);
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ",
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UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
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UT_LINESIZE, UT_LINESIZE, bp->ut_line,
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UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
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ct, ct + 11);
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if (!T->logout)
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puts(" still logged in");
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else {
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if (T->logout < 0) {
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T->logout = -T->logout;
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printf("- %s", crmsg);
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if (bp->ut_name[0] == '\0' || want(bp)) {
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/* find associated tty */
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for (tt = ttylist.lh_first; ; tt = tt->list.le_next) {
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if (tt == NULL) {
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/* add new one */
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tt = malloc(sizeof(struct ttytab));
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if (tt == NULL)
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err(1, "malloc failure");
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tt->logout = currentout;
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strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
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LIST_INSERT_HEAD(&ttylist, tt, list);
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break;
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}
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else
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printf("- %5.5s",
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ctime(&T->logout)+11);
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delta = T->logout - bp->ut_time;
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if (delta < 86400)
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printf(" (%5.5s)\n",
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asctime(gmtime(&delta))+11);
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else
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printf(" (%ld+%5.5s)\n",
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delta / 86400,
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asctime(gmtime(&delta))+11);
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if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
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break;
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}
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if (bp->ut_name[0]) {
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/*
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* when uucp and ftp log in over a network, the entry in
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* the utmp file is the name plus their process id. See
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* etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
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*/
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if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
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bp->ut_line[3] = '\0';
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else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
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bp->ut_line[4] = '\0';
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ct = ctime(&bp->ut_time);
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printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ",
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UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
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UT_LINESIZE, UT_LINESIZE, bp->ut_line,
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UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
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ct, ct + 11);
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if (!tt->logout)
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puts(" still logged in");
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else {
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if (tt->logout < 0) {
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tt->logout = -tt->logout;
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printf("- %s", crmsg);
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}
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else
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printf("- %5.5s",
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ctime(&tt->logout)+11);
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delta = tt->logout - bp->ut_time;
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if (delta < 86400)
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printf(" (%5.5s)\n",
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asctime(gmtime(&delta))+11);
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else
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printf(" (%ld+%5.5s)\n",
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delta / 86400,
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asctime(gmtime(&delta))+11);
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}
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LIST_REMOVE(tt, list);
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free(tt);
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if (maxrec != -1 && !--maxrec)
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return;
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} else {
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tt->logout = bp->ut_time;
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}
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if (maxrec != -1 && !--maxrec)
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return;
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}
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T->logout = bp->ut_time;
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}
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}
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ct = ctime(&buf[0].ut_time);
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@ -270,22 +294,11 @@ wtmp()
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* see if want this entry
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*/
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int
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want(bp, check)
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want(bp)
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struct utmp *bp;
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int check;
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{
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ARG *step;
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if (check)
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/*
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* when uucp and ftp log in over a network, the entry in
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* the utmp file is the name plus their process id. See
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* etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
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*/
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if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
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bp->ut_line[3] = '\0';
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else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
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bp->ut_line[4] = '\0';
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if (!arglist)
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return (YES);
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@ -326,24 +339,6 @@ addarg(type, arg)
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arglist = cur;
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}
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/*
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* addtty --
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* add an entry to a linked list of ttys
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*/
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TTY *
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addtty(ttyname)
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char *ttyname;
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{
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TTY *cur;
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if (!(cur = (TTY *)malloc((u_int)sizeof(TTY))))
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err(1, "malloc failure");
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cur->next = ttylist;
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cur->logout = currentout;
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memmove(cur->tty, ttyname, UT_LINESIZE);
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return (ttylist = cur);
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}
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/*
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* hostconv --
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* convert the hostname to search pattern; if the supplied host name
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