2 * Copyright (c) 1989 - 1994, Julianne Frances Haugh
3 * Copyright (c) 1996 - 1998, Marek Michałkiewicz
4 * Copyright (c) 2003 - 2005, Tomasz Kłoczko
5 * Copyright (c) 2008 , Nicolas François
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9 * modification, are permitted provided that the following conditions
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37 #include <sys/types.h>
43 #include "prototypes.h"
46 * dolastlog - create lastlog entry
48 * A "last login" entry is created for the user being logged in. The
49 * UID is extracted from the global (struct passwd) entry and the
50 * TTY information is gotten from the (struct utmp).
53 dolastlog (struct lastlog *ll, const struct passwd *pw, const char *line,
58 struct lastlog newlog;
62 * If the file does not exist, don't create it.
65 fd = open (LASTLOG_FILE, O_RDWR);
71 * The file is indexed by UID number. Seek to the record
72 * for this UID. Negative UID's will create problems, but ...
75 offset = (off_t) pw->pw_uid * sizeof newlog;
77 if (lseek (fd, offset, SEEK_SET) != offset) {
83 * Read the old entry so we can tell the user when they last
84 * logged in. Then construct the new entry and write it out
85 * the way we read the old one in.
88 if (read (fd, (void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog) {
89 memzero (&newlog, sizeof newlog);
95 ll_time = newlog.ll_time;
96 (void) time (&ll_time);
97 newlog.ll_time = ll_time;
98 strncpy (newlog.ll_line, line, sizeof newlog.ll_line);
100 strncpy (newlog.ll_host, host, sizeof newlog.ll_host);
102 if ( (lseek (fd, offset, SEEK_SET) != offset)
103 || (write (fd, (const void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog)
104 || (close (fd) != 0)) {
106 "Can't write lastlog entry for UID %lu in %s.",
107 (unsigned long) pw->pw_uid, LASTLOG_FILE));