diff options
Diffstat (limited to 'lib/readutmp.c')
| -rw-r--r-- | lib/readutmp.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/lib/readutmp.c b/lib/readutmp.c deleted file mode 100644 index 634d9ab1f..000000000 --- a/lib/readutmp.c +++ /dev/null @@ -1,161 +0,0 @@ -/* GNU's read utmp module. - Copyright (C) 1992-2001, 2003, 2004, 2005 Free Software Foundation, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -/* Written by jla; revised by djm */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#include "readutmp.h" - -#include <errno.h> -#include <stdio.h> - -#include <sys/types.h> -#include <sys/stat.h> -#include <signal.h> -#include <stdbool.h> -#include <string.h> -#include <stdlib.h> - -#include "xalloc.h" - -#if USE_UNLOCKED_IO -# include "unlocked-io.h" -#endif - -#ifndef SIZE_MAX -# define SIZE_MAX ((size_t) -1) -#endif - -/* Copy UT->ut_name into storage obtained from malloc. Then remove any - trailing spaces from the copy, NUL terminate it, and return the copy. */ - -char * -extract_trimmed_name (const STRUCT_UTMP *ut) -{ - char *p, *trimmed_name; - - trimmed_name = xmalloc (sizeof (UT_USER (ut)) + 1); - strncpy (trimmed_name, UT_USER (ut), sizeof (UT_USER (ut))); - /* Append a trailing NUL. Some systems pad names shorter than the - maximum with spaces, others pad with NULs. Remove any trailing - spaces. */ - trimmed_name[sizeof (UT_USER (ut))] = '\0'; - for (p = trimmed_name + strlen (trimmed_name); - trimmed_name < p && p[-1] == ' '; - *--p = '\0') - continue; - return trimmed_name; -} - -/* Is the utmp entry U desired by the user who asked for OPTIONS? */ - -static inline bool -desirable_utmp_entry (STRUCT_UTMP const *u, int options) -{ - return ! (options & READ_UTMP_CHECK_PIDS - && IS_USER_PROCESS (u) - && (UT_PID (u) <= 0 - || (kill (UT_PID (u), 0) < 0 && errno == ESRCH))); -} - -/* Read the utmp entries corresponding to file FILE into freshly- - malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to - the number of entries, and return zero. If there is any error, - return -1, setting errno, and don't modify the parameters. - If OPTIONS & READ_UTMP_CHECK_PIDS is nonzero, omit entries whose - process-IDs do not currently exist. */ - -#ifdef UTMP_NAME_FUNCTION - -int -read_utmp (char const *file, size_t *n_entries, STRUCT_UTMP **utmp_buf, - int options) -{ - size_t n_read = 0; - size_t n_alloc = 0; - STRUCT_UTMP *utmp = NULL; - STRUCT_UTMP *u; - - /* Ignore the return value for now. - Solaris' utmpname returns 1 upon success -- which is contrary - to what the GNU libc version does. In addition, older GNU libc - versions are actually void. */ - UTMP_NAME_FUNCTION (file); - - SET_UTMP_ENT (); - - while ((u = GET_UTMP_ENT ()) != NULL) - if (desirable_utmp_entry (u, options)) - { - if (n_read == n_alloc) - utmp = x2nrealloc (utmp, &n_alloc, sizeof *utmp); - - utmp[n_read++] = *u; - } - - END_UTMP_ENT (); - - *n_entries = n_read; - *utmp_buf = utmp; - - return 0; -} - -#else - -int -read_utmp (char const *file, size_t *n_entries, STRUCT_UTMP **utmp_buf, - int options) -{ - size_t n_read = 0; - size_t n_alloc = 0; - STRUCT_UTMP *utmp = NULL; - int saved_errno; - FILE *f = fopen (file, "r"); - - if (! f) - return -1; - - for (;;) - { - if (n_read == n_alloc) - utmp = x2nrealloc (utmp, &n_alloc, sizeof *utmp); - if (fread (&utmp[n_read], sizeof utmp[n_read], 1, f) == 0) - break; - n_read += desirable_utmp_entry (&utmp[n_read], options); - } - - saved_errno = ferror (f) ? errno : 0; - if (fclose (f) != 0) - saved_errno = errno; - if (saved_errno != 0) - { - free (utmp); - errno = saved_errno; - return -1; - } - - *n_entries = n_read; - *utmp_buf = utmp; - - return 0; -} - -#endif |