Add the who applet, supplied by Da Chen <dchen@ayrnetworks.com>

3 files changed, 98 insertions, 2 deletions

diff --git a/coreutils/who.c b/coreutils/who.c
new file mode 100644
index 000000000..3da7ed1c7
--- /dev/null
+++ b/coreutils/who.c
@@ -0,0 +1,85 @@
+/* vi: set sw=4 ts=4: */
+/*----------------------------------------------------------------------
+ * Mini who is used to display user name, login time, 
+ * idle time and host name.
+ *
+ * Author: Da Chen  <dchen@ayrnetworks.com>
+ *
+ * This is a free document; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation:
+ *    http://www.gnu.org/copyleft/gpl.html
+ *
+ * Copyright (c) 2002 AYR Networks, Inc. 
+ *----------------------------------------------------------------------
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <utmp.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <busybox.h>
+
+extern int who_main(int argc, char **argv)
+{
+    struct utmp *ut;
+    struct stat st;
+    int         devlen, len;
+    time_t      now, idle; 
+
+    if (argc > 1) 
+        show_usage();
+
+    setutent();
+    devlen = sizeof("/dev/") - 1;
+    printf("USER       TTY      IDLE      FROM           HOST\n"); 
+
+    while ((ut = getutent()) != NULL) {
+        char name[40];
+
+        if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) { 
+            len = strlen(ut->ut_line);
+            if (ut->ut_line[0] == '/') { 
+               strncpy(name, ut->ut_line, len);
+               name[len] = '\0';
+               strcpy(ut->ut_line, ut->ut_line + devlen);
+            } else {
+               strcpy(name, "/dev/");
+               strncpy(name+devlen, ut->ut_line, len);
+               name[devlen+len] = '\0';
+            }
+           
+            printf("%-10s %-8s ", ut->ut_user, ut->ut_line);
+
+            if (stat(name, &st) == 0) {
+                now = time(NULL);        
+                idle = now -  st.st_atime;
+            
+                if (idle < 60)
+                    printf("00:00m    ");
+                else if (idle < (60 * 60)) 
+                    printf("00:%02dm    ", (int)(idle / 60));
+                else if (idle < (24 * 60 * 60)) 
+                    printf("%02d:%02dm    ", (int)(idle / (60 * 60)),
+                           (int)(idle % (60 * 60)) / 60);
+                else if (idle < (24 * 60 * 60 * 365)) 
+                    printf("%03ddays   ", (int)(idle / (24 * 60 * 60)));
+                else 
+                    printf("%02dyears   ", (int) (idle / (24 * 60 * 60 * 365)));
+            } else 
+                printf("%-8s  ", "?");       
+      
+            printf("%-12.12s   %s\n", ctime(&(ut->ut_tv.tv_sec)) + 4, ut->ut_host);
+        }
+    }
+    endutent();
+
+    return 0;
+}
+       
+     
diff --git a/include/applets.h b/include/applets.h
index 6760fc5a1..aaac6a9d4 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -506,6 +506,9 @@
 #ifdef CONFIG_WHICH
 	APPLET(which, which_main, _BB_DIR_USR_BIN)
 #endif
+#ifdef CONFIG_WHO
+	APPLET(who, who_main, _BB_DIR_USR_BIN)
+#endif
 #ifdef CONFIG_WHOAMI
 	APPLET(whoami, whoami_main, _BB_DIR_USR_BIN)
 #endif
diff --git a/include/usage.h b/include/usage.h
index bd5e913c0..d690d90f9 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1261,9 +1261,13 @@
 	"$ mv /tmp/foo /bin/bar\n" 
 
 #define nc_trivial_usage \
-	"[IP] [port]" 
+	"[OPTIONS] [IP] [port]" 
 #define nc_full_usage \
-	"Netcat opens a pipe to IP:port"
+	"Netcat opens a pipe to IP:port\n\n" \
+	"Options:\n" \
+	"\t-l\t\tlisten mode, for inbound connects\n" \
+	"\t-p PORT\t\tlocal port number\n" \
+	"\t-e PROG\t\tprogram to exec after connect (dangerous!)"
 #define nc_example_usage \
 	"$ nc foobar.somedomain.com 25\n" \
 	"220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600\n" \
@@ -1967,6 +1971,10 @@
 #define which_example_usage \
 	"$ which login\n" \
 	"/bin/login\n"
+#define who_trivial_usage \
+        " "
+#define who_full_usage \
+        "Prints the current user names and related information"
 
 #define whoami_trivial_usage \
 	""