diff options
Diffstat (limited to 'libc/upstream-netbsd/lib/libc/gen/utmp.c')
-rw-r--r-- | libc/upstream-netbsd/lib/libc/gen/utmp.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/libc/upstream-netbsd/lib/libc/gen/utmp.c b/libc/upstream-netbsd/lib/libc/gen/utmp.c new file mode 100644 index 000000000..9fb0799db --- /dev/null +++ b/libc/upstream-netbsd/lib/libc/gen/utmp.c @@ -0,0 +1,106 @@ +/* $NetBSD: utmp.c,v 1.10 2011/10/15 23:00:02 christos Exp $ */ + +/*- + * Copyright (c) 2002 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Christos Zoulas. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#include <sys/cdefs.h> + +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: utmp.c,v 1.10 2011/10/15 23:00:02 christos Exp $"); +#endif /* LIBC_SCCS and not lint */ + +#include "namespace.h" +#include <sys/types.h> +#include <sys/param.h> +#include <stdio.h> +#include <string.h> +#include <time.h> +#include <utmp.h> +#include <sys/stat.h> + +static struct utmp utmp; +static FILE *ut; +static char utfile[MAXPATHLEN] = _PATH_UTMP; + +void +setutent(void) +{ + if (ut == NULL) + return; + (void)fseeko(ut, (off_t)0, SEEK_SET); +} + +struct utmp * +getutent(void) +{ + if (ut == NULL) { + struct stat st; + off_t numentries; + if ((ut = fopen(utfile, "re")) == NULL) + return NULL; + if (fstat(fileno(ut), &st) == -1) + goto out; + /* + * If we have a an old version utmp file bail. + */ + numentries = st.st_size / sizeof(utmp); + if ((off_t)(numentries * sizeof(utmp)) != st.st_size) + goto out; + } + if (fread(&utmp, sizeof(utmp), 1, ut) == 1) + return &utmp; +out: + (void)fclose(ut); + return NULL; +} + +void +endutent(void) +{ + if (ut != NULL) { + (void)fclose(ut); + ut = NULL; + } +} + +int +utmpname(const char *fname) +{ + size_t len = strlen(fname); + + if (len >= sizeof(utfile)) + return 0; + + /* must not end in x! */ + if (fname[len - 1] == 'x') + return 0; + + (void)strlcpy(utfile, fname, sizeof(utfile)); + endutent(); + return 1; +} |