--- /dev/null
+/* GNU's who.
+ Copyright (C) 92, 93, 94, 95, 96, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by jla; revised by djm */
+
+/* Output format:
+ name [state] line time [idle] host
+ state: -T
+ name, line, time: not -q
+ idle: -u
+*/
+
+#include <config.h>
+#include <getopt.h>
+
+#include "system.h"
+#include "error.h"
+#include "readutmp.h"
+
+#ifndef MAXHOSTNAMELEN
+# define MAXHOSTNAMELEN 64
+#endif
+
+#ifndef S_IWGRP
+# define S_IWGRP 020
+#endif
+
+int gethostname ();
+char *ttyname ();
+char *xmalloc ();
+
+/* The name this program was run with. */
+char *program_name;
+
+/* If nonzero, display usage information and exit. */
+static int show_help;
+
+/* If nonzero, print the version on standard output and exit. */
+static int show_version;
+
+/* If nonzero, display only a list of usernames and count of
+ the users logged on.
+ Ignored for `who am i'. */
+static int short_list;
+
+/* If nonzero, display the hours:minutes since each user has touched
+ the keyboard, or "." if within the last minute, or "old" if
+ not within the last day. */
+static int include_idle;
+
+/* If nonzero, display a line at the top describing each field. */
+static int include_heading;
+
+/* If nonzero, display a `+' for each user if mesg y, a `-' if mesg n,
+ or a `?' if their tty cannot be statted. */
+static int include_mesg;
+
+static struct option const longopts[] =
+{
+ {"count", no_argument, NULL, 'q'},
+ {"idle", no_argument, NULL, 'u'},
+ {"heading", no_argument, NULL, 'H'},
+ {"message", no_argument, NULL, 'T'},
+ {"mesg", no_argument, NULL, 'T'},
+ {"writable", no_argument, NULL, 'T'},
+ {"help", no_argument, &show_help, 1},
+ {"version", no_argument, &show_version, 1},
+ {NULL, 0, NULL, 0}
+};
+
+/* Return a string representing the time between WHEN and the time
+ that this function is first run. */
+
+static const char *
+idle_string (time_t when)
+{
+ static time_t now = 0;
+ static char idle_hhmm[10];
+ time_t seconds_idle;
+
+ if (now == 0)
+ time (&now);
+
+ seconds_idle = now - when;
+ if (seconds_idle < 60) /* One minute. */
+ return " . ";
+ if (seconds_idle < (24 * 60 * 60)) /* One day. */
+ {
+ sprintf (idle_hhmm, "%02d:%02d",
+ (int) (seconds_idle / (60 * 60)),
+ (int) ((seconds_idle % (60 * 60)) / 60));
+ return (const char *) idle_hhmm;
+ }
+ return _(" old ");
+}
+
+/* Display a line of information about entry THIS. */
+
+static void
+print_entry (STRUCT_UTMP *this)
+{
+ struct stat stats;
+ time_t last_change;
+ char mesg;
+
+#define DEV_DIR_WITH_TRAILING_SLASH "/dev/"
+#define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1)
+
+ char line[sizeof (this->ut_line) + DEV_DIR_LEN + 1];
+ time_t tm;
+
+ /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not
+ already an absolute pathname. Some system may put the full,
+ absolute pathname in ut_line. */
+ if (this->ut_line[0] == '/')
+ {
+ strncpy (line, this->ut_line, sizeof (this->ut_line));
+ line[sizeof (this->ut_line)] = '\0';
+ }
+ else
+ {
+ strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
+ strncpy (line + DEV_DIR_LEN, this->ut_line, sizeof (this->ut_line));
+ line[DEV_DIR_LEN + sizeof (this->ut_line)] = '\0';
+ }
+
+ if (stat (line, &stats) == 0)
+ {
+ mesg = (stats.st_mode & S_IWGRP) ? '+' : '-';
+ last_change = stats.st_atime;
+ }
+ else
+ {
+ mesg = '?';
+ last_change = 0;
+ }
+
+ printf ("%-8.*s", (int) sizeof (this->ut_name), this->ut_name);
+ if (include_mesg)
+ printf (" %c ", mesg);
+ printf (" %-8.*s", (int) sizeof (this->ut_line), this->ut_line);
+
+ /* Don't take the address of UT_TIME_MEMBER directly.
+ Ulrich Drepper wrote:
+ ``... GNU libc (and perhaps other libcs as well) have extended
+ utmp file formats which do not use a simple time_t ut_time field.
+ In glibc, ut_time is a macro which selects for backward compatibility
+ the tv_sec member of a struct timeval value.'' */
+ tm = UT_TIME_MEMBER (this);
+ printf (" %-12.12s", ctime (&tm) + 4);
+
+ if (include_idle)
+ {
+ if (last_change)
+ printf (" %s", idle_string (last_change));
+ else
+ printf (" . ");
+ }
+#ifdef HAVE_UT_HOST
+ if (this->ut_host[0])
+ {
+ extern char *canon_host ();
+ char ut_host[sizeof (this->ut_host) + 1];
+ char *host = 0, *display = 0;
+
+ /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
+ strncpy (ut_host, this->ut_host, (int) sizeof (this->ut_host));
+ ut_host[sizeof (this->ut_host)] = '\0';
+
+ /* Look for an X display. */
+ display = strrchr (ut_host, ':');
+ if (display)
+ *display++ = '\0';
+
+ if (*ut_host)
+ /* See if we can canonicalize it. */
+ host = canon_host (ut_host);
+ if (! host)
+ host = ut_host;
+
+ if (display)
+ printf (" (%s:%s)", host, display);
+ else
+ printf (" (%s)", host);
+ }
+#endif
+
+ putchar ('\n');
+}
+
+/* Print the username of each valid entry and the number of valid entries
+ in `utmp_contents', which should have N elements. */
+
+static void
+list_entries_who (int n)
+{
+ register STRUCT_UTMP *this = utmp_contents;
+ int entries;
+
+ entries = 0;
+ while (n--)
+ {
+ if (this->ut_name[0]
+#ifdef USER_PROCESS
+ && this->ut_type == USER_PROCESS
+#endif
+ )
+ {
+ char *trimmed_name;
+
+ trimmed_name = extract_trimmed_name (this);
+
+ printf ("%s ", trimmed_name);
+ free (trimmed_name);
+ entries++;
+ }
+ this++;
+ }
+ printf (_("\n# users=%u\n"), entries);
+}
+
+static void
+print_heading (void)
+{
+ printf ("%-8s ", _("USER"));
+ if (include_mesg)
+ printf (_("MESG "));
+ printf ("%-8s ", _("LINE"));
+ printf (_("LOGIN-TIME "));
+ if (include_idle)
+ printf (_("IDLE "));
+ printf (_("FROM\n"));
+}
+
+/* Display `utmp_contents', which should have N entries. */
+
+static void
+scan_entries (int n)
+{
+ register STRUCT_UTMP *this = utmp_contents;
+
+ if (include_heading)
+ print_heading ();
+
+ while (n--)
+ {
+ if (this->ut_name[0]
+#ifdef USER_PROCESS
+ && this->ut_type == USER_PROCESS
+#endif
+ )
+ print_entry (this);
+ this++;
+ }
+}
+
+/* Display a list of who is on the system, according to utmp file FILENAME. */
+
+static void
+who (const char *filename)
+{
+ int users = read_utmp (filename);
+ if (short_list)
+ list_entries_who (users);
+ else
+ scan_entries (users);
+}
+
+/* Search `utmp_contents', which should have N entries, for
+ an entry with a `ut_line' field identical to LINE.
+ Return the first matching entry found, or NULL if there
+ is no matching entry. */
+
+static STRUCT_UTMP *
+search_entries (int n, char *line)
+{
+ register STRUCT_UTMP *this = utmp_contents;
+
+ while (n--)
+ {
+ if (this->ut_name[0]
+#ifdef USER_PROCESS
+ && this->ut_type == USER_PROCESS
+#endif
+ && !strncmp (line, this->ut_line, sizeof (this->ut_line)))
+ return this;
+ this++;
+ }
+ return NULL;
+}
+
+/* Display the entry in utmp file FILENAME for this tty on standard input,
+ or nothing if there is no entry for it. */
+
+static void
+who_am_i (char *filename)
+{
+ register STRUCT_UTMP *utmp_entry;
+ char hostname[MAXHOSTNAMELEN + 1];
+ char *tty;
+
+ if (gethostname (hostname, MAXHOSTNAMELEN + 1))
+ *hostname = 0;
+
+ if (include_heading)
+ {
+ printf ("%*s ", (int) strlen (hostname), " ");
+ print_heading ();
+ }
+
+ tty = ttyname (0);
+ if (tty == NULL)
+ return;
+ tty += 5; /* Remove "/dev/". */
+
+ utmp_entry = search_entries (read_utmp (filename), tty);
+ if (utmp_entry == NULL)
+ return;
+
+ printf ("%s!", hostname);
+ print_entry (utmp_entry);
+}
+
+static void
+usage (int status)
+{
+ if (status != 0)
+ fprintf (stderr, _("Try `%s --help' for more information.\n"),
+ program_name);
+ else
+ {
+ printf (_("Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n"), program_name);
+ printf (_("\
+\n\
+ -H, --heading print line of column headings\n\
+ -i, -u, --idle add user idle time as HOURS:MINUTES, . or old\n\
+ -m only hostname and user associated with stdin\n\
+ -q, --count all login names and number of users logged on\n\
+ -s (ignored)\n\
+ -T, -w, --mesg add user's message status as +, - or ?\n\
+ --message same as -T\n\
+ --writable same as -T\n\
+ --help display this help and exit\n\
+ --version output version information and exit\n\
+\n\
+If FILE is not specified, use %s. %s as FILE is common.\n\
+If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\
+"), UTMP_FILE, WTMP_FILE);
+ puts (_("\nReport bugs to <sh-utils-bugs@gnu.ai.mit.edu>."));
+ }
+ exit (status);
+}
+
+int
+main (int argc, char **argv)
+{
+ int optc, longind;
+ int my_line_only = 0;
+
+ program_name = argv[0];
+ setlocale (LC_ALL, "");
+ bindtextdomain (PACKAGE, LOCALEDIR);
+ textdomain (PACKAGE);
+
+ while ((optc = getopt_long (argc, argv, "imqsuwHT", longopts, &longind)) != -1)
+ {
+ switch (optc)
+ {
+ case 0:
+ break;
+
+ case 'm':
+ my_line_only = 1;
+ break;
+
+ case 'q':
+ short_list = 1;
+ break;
+
+ case 's':
+ break;
+
+ case 'i':
+ case 'u':
+ include_idle = 1;
+ break;
+
+ case 'H':
+ include_heading = 1;
+ break;
+
+ case 'w':
+ case 'T':
+ include_mesg = 1;
+ break;
+
+ default:
+ usage (1);
+ }
+ }
+
+ if (show_version)
+ {
+ printf ("who (%s) %s\n", GNU_PACKAGE, VERSION);
+ exit (0);
+ }
+
+ if (show_help)
+ usage (0);
+
+ switch (argc - optind)
+ {
+ case 0: /* who */
+ if (my_line_only)
+ who_am_i (UTMP_FILE);
+ else
+ who (UTMP_FILE);
+ break;
+
+ case 1: /* who <utmp file> */
+ if (my_line_only)
+ who_am_i (argv[optind]);
+ else
+ who (argv[optind]);
+ break;
+
+ case 2: /* who <blurf> <glop> */
+ who_am_i (UTMP_FILE);
+ break;
+
+ default: /* lose */
+ error (0, 0, _("too many arguments"));
+ usage (1);
+ }
+
+ exit (0);
+}
projects / thirdparty / coreutils.git / commitdiff
