1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #include <string.h> 29 #include <stdio.h> 30 #include <utmp.h> 31 32 33 void pututline(struct utmp* utmp) 34 { 35 FILE* f; 36 struct utmp u; 37 long i; 38 39 if (!(f = fopen(_PATH_UTMP, "w+e"))) 40 return; 41 42 while (fread(&u, sizeof(struct utmp), 1, f) == 1) 43 { 44 if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) -1)) 45 { 46 if ((i = ftell(f)) < 0) 47 goto ret; 48 if (fseek(f, i - sizeof(struct utmp), SEEK_SET) < 0) 49 goto ret; 50 fwrite(utmp, sizeof(struct utmp), 1, f); 51 goto ret; 52 } 53 } 54 55 56 fclose(f); 57 58 if (!(f = fopen(_PATH_UTMP, "w+e"))) 59 return; 60 fwrite(utmp, sizeof(struct utmp), 1, f); 61 62 ret: 63 fclose(f); 64 } 65
