1 /* who.c - display who is on the system 2 * 3 * Copyright 2012 ProFUSION Embedded Systems 4 * 5 * by Luis Felipe Strano Moraes <[email protected]> 6 * 7 * See http://opengroup.org/onlinepubs/9699919799/utilities/who.html 8 * 9 * Posix says to support many options (-abdHlmpqrstTu) but this 10 * isn't aimed at minicomputers with modem pools. 11 * 12 * TODO: -a doesn't know how to format other entries 13 14 USE_WHO(NEWTOY(who, "a", TOYFLAG_USR|TOYFLAG_BIN)) 15 16 config WHO 17 bool "who" 18 default y 19 help 20 usage: who 21 22 Print information about logged in users. 23 */ 24 25 #define FOR_who 26 #include "toys.h" 27 who_main(void)28void who_main(void) 29 { 30 struct utmpx *entry; 31 32 setutxent(); 33 while ((entry = getutxent())) { 34 if (FLAG(a) || entry->ut_type == USER_PROCESS) { 35 time_t t = entry->ut_tv.tv_sec; 36 struct tm *tm = localtime(&t); 37 38 strftime(toybuf, sizeof(toybuf), "%F %H:%M", tm); 39 printf("%s\t%s\t%s (%s)\n", entry->ut_user, entry->ut_line, 40 toybuf, entry->ut_host); 41 } 42 } 43 endutxent(); 44 } 45