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annotate xwrited-utmp-utmpx.c @ 6:c2ddd2f977d1

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author Guido Berhoerster <guido+xwrited@berhoerster.name>
date Sun, 27 Apr 2014 23:12:06 +0200
parents 52694b49dcc4
children 4a5330979433
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1 /*
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2 * Copyright (C) 2010 Guido Berhoerster <guido+xwrited@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #define _XOPEN_SOURCE 600
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25
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26 #include <glib.h>
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27 #include <stdlib.h>
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28 #include <string.h>
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29 #include <unistd.h>
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30 #include <pwd.h>
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31 #include <utmpx.h>
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32 #include <errno.h>
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33 #include <sys/time.h>
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34
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35 #define DEV_PREFIX "/dev/"
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36
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37 static void
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38 utmp_write_entry(int fd, gboolean add)
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39 {
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40 struct utmpx utmpx;
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41 char *line = NULL;
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42 size_t line_len;
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43 char *id;
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44 struct passwd *pwd;
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45
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46 line = ptsname(fd);
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47 if (line == NULL) {
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48 g_critical("failed to obtain slave pty name");
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49 return;
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50 }
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51 if (g_str_has_prefix(line, DEV_PREFIX)) {
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52 line += strlen(DEV_PREFIX);
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53 }
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54
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55 line_len = strlen(line);
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56 id = (line_len >= sizeof (utmpx.ut_pid)) ?
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57 line + (line_len - sizeof (utmpx.ut_pid)) :
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58 line;
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59
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60 pwd = getpwuid(getuid());
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61 if (pwd == NULL) {
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62 g_critical("failed to get username: %s", g_strerror(errno));
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63 return;
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64 }
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65
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66 memset(&utmpx, 0, sizeof (utmpx));
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67 strncpy(utmpx.ut_name, pwd->pw_name, sizeof (utmpx.ut_name));
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68 strncpy(utmpx.ut_id, id, sizeof (utmpx.ut_id));
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69 strncpy(utmpx.ut_line, line, sizeof (utmpx.ut_line));
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70 utmpx.ut_pid = getpid();
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71 utmpx.ut_type = add ? USER_PROCESS : DEAD_PROCESS;
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72 gettimeofday(&utmpx.ut_tv, NULL);
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73
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74 setutxent();
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75 if (pututxline(&utmpx) == NULL) {
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76 g_critical("failed to write to utmpx database: %s",
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77 g_strerror(errno));
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78 return;
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79 }
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80 endutxent();
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81 }
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82
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83 void
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84 xwrited_utmp_add_entry(int fd)
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85 {
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86 utmp_write_entry(fd, TRUE);
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87 }
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88
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89 void
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90 xwrited_utmp_remove_entry(int fd)
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91 {
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92 utmp_write_entry(fd, FALSE);
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93 }