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glibc/login/getutline_r.c
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/* Copyright (C) 1996 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 of the | |
License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If | |
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <utmp.h> | |
/* For implementing this function we don't use the getutent_r function | |
because we can avoid the reposition on every new entry this way. */ | |
int | |
getutline_r (const struct utmp *line, struct utmp **utmp, | |
struct utmp_data *utmp_data) | |
{ | |
/* Open utmp file if not already done. */ | |
if (utmp_data->ut_fd == -1) | |
{ | |
setutent_r (utmp_data); | |
if (utmp_data->ut_fd == -1) | |
return -1; | |
} | |
/* Position file correctly. */ | |
if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1) | |
return -1; | |
while (1) | |
{ | |
/* Read the next entry. */ | |
if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp)) | |
!= sizeof (struct utmp)) | |
{ | |
utmp_data->loc_utmp = 0; /* Mark UTMP_DATA->ubuf invalid. */ | |
errno = ESRCH; | |
return -1; | |
} | |
/* Update position pointer. */ | |
utmp_data->loc_utmp += sizeof (struct utmp); | |
if ( | |
#if _HAVE_UT_TYPE - 0 | |
(utmp_data->ubuf.ut_type == USER_PROCESS | |
|| utmp_data->ubuf.ut_type == LOGIN_PROCESS) | |
&& | |
#endif | |
! strncmp (line->ut_line, utmp_data->ubuf.ut_line, | |
sizeof line->ut_line)) | |
/* Stop if we found a user or login entry. */ | |
break; | |
} | |
*utmp = &utmp_data->ubuf; | |
return 0; | |
} |