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 if ((fd = open (LASTLOG_FILE, O_RDWR)) == -1)
69 * The file is indexed by UID number. Seek to the record
70 * for this UID. Negative UID's will create problems, but ...
73 offset = (unsigned long) pw->pw_uid * sizeof newlog;
75 if (lseek (fd, offset, SEEK_SET) != offset) {
81 * Read the old entry so we can tell the user when they last
82 * logged in. Then construct the new entry and write it out
83 * the way we read the old one in.
86 if (read (fd, (char *) &newlog, sizeof newlog) != sizeof newlog)
87 memzero (&newlog, sizeof newlog);
91 ll_time = newlog.ll_time;
93 newlog.ll_time = ll_time;
94 strncpy (newlog.ll_line, line, sizeof newlog.ll_line);
96 strncpy (newlog.ll_host, host, sizeof newlog.ll_host);
98 if (lseek (fd, offset, SEEK_SET) == offset)
99 write (fd, (char *) &newlog, sizeof newlog);