commit 422f400c2182ef0cdcdf0e237aac2bb9a5a9dd03
parent ac57c4ab7f0e2d64b503ec9f1863414c4eebeff7
Author: sin <sin@2f30.org>
Date: Fri, 14 Feb 2014 15:03:48 +0000
Import who from sbase
Diffstat:
| M | Makefile | | | 3 | ++- |
| A | who.1 | | | 27 | +++++++++++++++++++++++++++ |
| A | who.c | | | 63 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 92 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -48,7 +48,8 @@ SRC = \
umount.c \
unshare.c \
uptime.c \
- watch.c
+ watch.c \
+ who.c
MAN1 = \
chvt.1 \
diff --git a/who.1 b/who.1
@@ -0,0 +1,27 @@
+.TH WHO 1 sbase\-VERSION
+.SH NAME
+who \- print who has logged on
+.SH SYNOPSIS
+.B who
+.RB [ -m ]
+
+.SH DESCRIPTION
+.B who
+prints a list of who has logged on, their controlling tty, and the
+time at which they logged on.
+.SH OPTIONS
+.TP
+.B \-m
+only show users on current tty
+.TP
+.B \-l
+also print LOGIN processes
+
+.SH BUGS
+.B who
+relies on the utmp file to be updated responsibly. This
+doesn't always happen, which can cause who to print completely
+bogus data.
+
+.SH SEE ALSO
+.IR utmp (5)
diff --git a/who.c b/who.c
@@ -0,0 +1,63 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <utmp.h>
+#include "util.h"
+
+static void
+usage(void)
+{
+ eprintf("usage: who [-ml]\n");
+}
+
+int
+main(int argc, char **argv)
+{
+ struct utmp usr;
+ FILE *ufp;
+ char timebuf[sizeof "yyyy-mm-dd hh:mm"];
+ char *tty, *ttmp;
+ int mflag = 0, lflag = 0;
+ time_t t;
+
+ ARGBEGIN {
+ case 'm':
+ mflag = 1;
+ tty = ttyname(STDIN_FILENO);
+ if (!tty)
+ eprintf("who: stdin:");
+ if ((ttmp = strrchr(tty, '/')))
+ tty = ttmp+1;
+ break;
+ case 'l':
+ lflag = 1;
+ break;
+ default:
+ usage();
+ } ARGEND;
+
+ if (argc > 0)
+ usage();
+
+ if (!(ufp = fopen("/var/run/utmp", "r")))
+ eprintf("who: '%s':", "/var/run/utmp");
+
+ while(fread(&usr, sizeof(usr), 1, ufp) == 1) {
+ if (!*usr.ut_name || !*usr.ut_line ||
+ usr.ut_line[0] == '~')
+ continue;
+ if (mflag && strcmp(usr.ut_line, tty))
+ continue;
+ if (strcmp(usr.ut_name, "LOGIN") == lflag)
+ continue;
+ t = usr.ut_time;
+ strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
+ printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, timebuf);
+ }
+ fclose(ufp);
+ return EXIT_SUCCESS;
+}
+
