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w: new applet, alias to "who -H"

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function                                             old     new   delta
who_main                                             451     463     +12
packed_usage                                       31477   31485      +8
applet_main                                         1508    1512      +4
applet_names                                        2606    2608      +2
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(add/remove: 0/0 grow/shrink: 4/0 up/down: 26/0)               Total: 26 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-04-11 18:17:03 +02:00
parent 67918b32ab
commit 1bc0bd13b5
1 changed files with 44 additions and 4 deletions
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46
coreutils/who.c
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@ -23,6 +23,14 @@
//config: help
//config: who is used to show who is logged on.
//config:
// procps-ng has this variation of "who":
//config:config W
//config: bool "w"
//config: default y
//config: depends on FEATURE_UTMP
//config: help
//config: w is used to show who is logged on.
//config:
//config:config USERS
//config: bool "users"
//config: default y
@ -32,6 +40,7 @@
// APPLET_ODDNAME:name main location suid_type help
//applet:IF_USERS(APPLET_ODDNAME(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
//applet:IF_USERS(APPLET_ODDNAME(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w))
//applet:IF_WHO( APPLET( who, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_USERS) += who.o
@ -44,6 +53,31 @@
//usage:#define users_full_usage "\n\n"
//usage: "Print the users currently logged on"
//usage:#define w_trivial_usage
//usage: ""
//usage:#define w_full_usage "\n\n"
//usage: "Show who is logged on"
//
// procps-ng 3.3.10:
// "\n -h, --no-header"
// "\n -u, --no-current"
// Ignores the username while figuring out the current process
// and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u".
// "\n -s, --short"
// Short format. Don't print the login time, JCPU or PCPU times.
// "\n -f, --from"
// Toggle printing the from (remote hostname) field.
// The default is for the from field to not be printed
// "\n -i, --ip-addr"
// Display IP address instead of hostname for from field.
// "\n -o, --old-style"
// Old style output. Prints blank space for idle times less than one minute.
// Example output:
// 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90
// USER TTY LOGIN@ IDLE JCPU PCPU WHAT
// root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt
// root pts/1 Mon13 3:24m 1:01 0.01s w
//usage:#define who_trivial_usage
//usage: "[-a]"
//usage:#define who_full_usage "\n\n"
@ -74,14 +108,17 @@ static void idle_string(char *str6, time_t t)
int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int who_main(int argc UNUSED_PARAM, char **argv)
{
#define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO)
int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u'));
int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0'));
int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h'));
struct utmpx *ut;
unsigned opt;
int do_users = (ENABLE_USERS && (!ENABLE_WHO || applet_name[0] == 'u'));
const char *fmt = "%s";
opt_complementary = "=0";
opt = getopt32(argv, do_users ? "" : "aH");
if (opt & 2) // -H
opt = getopt32(argv, do_who ? "aH" : "");
if ((opt & 2) || do_w) /* -H or we are w */
puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
setutxent();
@ -115,6 +152,9 @@ int who_main(int argc UNUSED_PARAM, char **argv)
(int)sizeof(ut->ut_user), ut->ut_user,
(int)sizeof(ut->ut_line), ut->ut_line,
str6,
// TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows
// TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47").
// The former format looks saner to me. Switch to it unconditionally?
ctime(&seconds) + 4,
(int)sizeof(ut->ut_host), ut->ut_host
);