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top.c
1332 lines (1216 loc) · 34.6 KB
/
top.c
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/* vi: set sw=4 ts=4: */
/*
* A tiny 'top' utility.
*
* This is written specifically for the linux /proc/<PID>/stat(m)
* files format.
*
* This reads the PIDs of all processes and their status and shows
* the status of processes (first ones that fit to screen) at given
* intervals.
*
* NOTES:
* - At startup this changes to /proc, all the reads are then
* relative to that.
*
* (C) Eero Tamminen <oak at welho dot com>
*
* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
*
* Sept 2008: Vineet Gupta <vineet.gupta@arc.com>
* Added Support for reporting SMP Information
* - CPU where process was last seen running
* (to see effect of sched_setaffinity() etc)
* - CPU time split (idle/IO/wait etc) per CPU
*
* Copyright (c) 1992 Branko Lankester
* Copyright (c) 1992 Roger Binns
* Copyright (C) 1994-1996 Charles L. Blake.
* Copyright (C) 1992-1998 Michael K. Johnson
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* How to snapshot /proc for debugging top problems:
* for f in /proc/[0-9]*""/stat; do
* n=${f#/proc/}
* n=${n%/stat}_stat
* cp $f $n
* done
* cp /proc/stat /proc/meminfo /proc/loadavg .
* top -bn1 >top.out
*
* ...and how to run top on it on another machine:
* rm -rf proc; mkdir proc
* for f in [0-9]*_stat; do
* p=${f%_stat}
* mkdir -p proc/$p
* cp $f proc/$p/stat
* done
* cp stat meminfo loadavg proc
* chroot . ./top -bn1 >top1.out
*/
//config:config TOP
//config: bool "top (18 kb)"
//config: default y
//config: help
//config: The top program provides a dynamic real-time view of a running
//config: system.
//config:
//config:config FEATURE_TOP_INTERACTIVE
//config: bool "Accept keyboard commands"
//config: default y
//config: depends on TOP
//config: help
//config: Without this, top will only refresh display every 5 seconds.
//config: No keyboard commands will work, only ^C to terminate.
//config:
//config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
//config: bool "Show CPU per-process usage percentage"
//config: default y
//config: depends on TOP
//config: help
//config: Make top display CPU usage for each process.
//config: This adds about 2k.
//config:
//config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
//config: bool "Show CPU global usage percentage"
//config: default y
//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
//config: help
//config: Makes top display "CPU: NN% usr NN% sys..." line.
//config: This adds about 0.5k.
//config:
//config:config FEATURE_TOP_SMP_CPU
//config: bool "SMP CPU usage display ('c' key)"
//config: default y
//config: depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
//config: help
//config: Allow 'c' key to switch between individual/cumulative CPU stats
//config: This adds about 0.5k.
//config:
//config:config FEATURE_TOP_DECIMALS
//config: bool "Show 1/10th of a percent in CPU/mem statistics"
//config: default y
//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
//config: help
//config: Show 1/10th of a percent in CPU/mem statistics.
//config: This adds about 0.3k.
//config:
//config:config FEATURE_TOP_SMP_PROCESS
//config: bool "Show CPU process runs on ('j' field)"
//config: default y
//config: depends on TOP
//config: help
//config: Show CPU where process was last found running on.
//config: This is the 'j' field.
//config:
//config:config FEATURE_TOPMEM
//config: bool "Topmem command ('s' key)"
//config: default y
//config: depends on TOP
//config: help
//config: Enable 's' in top (gives lots of memory info).
//applet:IF_TOP(APPLET(top, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_TOP) += top.o
#include "libbb.h"
#define ESC "\033"
typedef struct top_status_t {
unsigned long vsz;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned long ticks;
unsigned pcpu; /* delta of ticks */
#endif
unsigned pid, ppid;
unsigned uid;
char state[4];
char comm[COMM_LEN];
#if ENABLE_FEATURE_TOP_SMP_PROCESS
int last_seen_on_cpu;
#endif
} top_status_t;
typedef struct jiffy_counts_t {
/* Linux 2.4.x has only first four */
unsigned long long usr, nic, sys, idle;
unsigned long long iowait, irq, softirq, steal;
unsigned long long total;
unsigned long long busy;
} jiffy_counts_t;
/* This structure stores some critical information from one frame to
the next. Used for finding deltas. */
typedef struct save_hist {
unsigned long ticks;
pid_t pid;
} save_hist;
typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
enum { SORT_DEPTH = 3 };
/* Screens wider than this are unlikely */
enum { LINE_BUF_SIZE = 512 - 64 };
struct globals {
top_status_t *top;
int ntop;
smallint inverted;
#if ENABLE_FEATURE_TOPMEM
smallint sort_field;
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
smallint smp_cpu_info; /* one/many cpu info lines? */
#endif
unsigned lines; /* screen height */
#if ENABLE_FEATURE_TOP_INTERACTIVE
struct termios initial_settings;
int scroll_ofs;
#define G_scroll_ofs G.scroll_ofs
#else
#define G_scroll_ofs 0
#endif
#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
cmp_funcp sort_function[1];
#else
cmp_funcp sort_function[SORT_DEPTH];
struct save_hist *prev_hist;
unsigned prev_hist_count;
jiffy_counts_t cur_jif, prev_jif;
/* int hist_iterations; */
unsigned total_pcpu;
/* unsigned long total_vsz; */
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
/* Per CPU samples: current and last */
jiffy_counts_t *cpu_jif, *cpu_prev_jif;
unsigned num_cpus;
#endif
#if ENABLE_FEATURE_TOP_INTERACTIVE
char kbd_input[KEYCODE_BUFFER_SIZE];
#endif
char line_buf[LINE_BUF_SIZE];
};
#define G (*ptr_to_globals)
#define top (G.top )
#define ntop (G.ntop )
#define sort_field (G.sort_field )
#define inverted (G.inverted )
#define smp_cpu_info (G.smp_cpu_info )
#define initial_settings (G.initial_settings )
#define sort_function (G.sort_function )
#define prev_hist (G.prev_hist )
#define prev_hist_count (G.prev_hist_count )
#define cur_jif (G.cur_jif )
#define prev_jif (G.prev_jif )
#define cpu_jif (G.cpu_jif )
#define cpu_prev_jif (G.cpu_prev_jif )
#define num_cpus (G.num_cpus )
#define total_pcpu (G.total_pcpu )
#define line_buf (G.line_buf )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
} while (0)
enum {
OPT_d = (1 << 0),
OPT_n = (1 << 1),
OPT_b = (1 << 2),
OPT_H = (1 << 3),
OPT_m = (1 << 4),
OPT_EOF = (1 << 5), /* pseudo: "we saw EOF in stdin" */
};
#define OPT_BATCH_MODE (option_mask32 & OPT_b)
#if ENABLE_FEATURE_TOP_INTERACTIVE
static int pid_sort(top_status_t *P, top_status_t *Q)
{
/* Buggy wrt pids with high bit set */
/* (linux pids are in [1..2^15-1]) */
return (Q->pid - P->pid);
}
#endif
static int mem_sort(top_status_t *P, top_status_t *Q)
{
/* We want to avoid unsigned->signed and truncation errors */
if (Q->vsz < P->vsz) return -1;
return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
}
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
static int pcpu_sort(top_status_t *P, top_status_t *Q)
{
/* Buggy wrt ticks with high bit set */
/* Affects only processes for which ticks overflow */
return (int)Q->pcpu - (int)P->pcpu;
}
static int time_sort(top_status_t *P, top_status_t *Q)
{
/* We want to avoid unsigned->signed and truncation errors */
if (Q->ticks < P->ticks) return -1;
return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
}
static int mult_lvl_cmp(void* a, void* b)
{
int i, cmp_val;
for (i = 0; i < SORT_DEPTH; i++) {
cmp_val = (*sort_function[i])(a, b);
if (cmp_val != 0)
break;
}
return inverted ? -cmp_val : cmp_val;
}
static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
{
#if !ENABLE_FEATURE_TOP_SMP_CPU
static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
#else
static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
#endif
int ret;
if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
return 0;
ret = sscanf(line_buf, fmt,
&p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
&p_jif->iowait, &p_jif->irq, &p_jif->softirq,
&p_jif->steal);
if (ret >= 4) {
p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
+ p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
/* procps 2.x does not count iowait as busy time */
p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
}
return ret;
}
static void get_jiffy_counts(void)
{
FILE* fp = xfopen_for_read("stat");
/* We need to parse cumulative counts even if SMP CPU display is on,
* they are used to calculate per process CPU% */
prev_jif = cur_jif;
if (read_cpu_jiffy(fp, &cur_jif) < 4)
bb_error_msg_and_die("can't read '%s'", "/proc/stat");
#if !ENABLE_FEATURE_TOP_SMP_CPU
fclose(fp);
return;
#else
if (!smp_cpu_info) {
fclose(fp);
return;
}
if (!num_cpus) {
/* First time here. How many CPUs?
* There will be at least 1 /proc/stat line with cpu%d
*/
while (1) {
cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
break;
num_cpus++;
}
if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
smp_cpu_info = 0;
cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
/* Otherwise the first per cpu display shows all 100% idles */
usleep(50000);
} else { /* Non first time invocation */
jiffy_counts_t *tmp;
int i;
/* First switch the sample pointers: no need to copy */
tmp = cpu_prev_jif;
cpu_prev_jif = cpu_jif;
cpu_jif = tmp;
/* Get the new samples */
for (i = 0; i < num_cpus; i++)
read_cpu_jiffy(fp, &cpu_jif[i]);
}
#endif
fclose(fp);
}
static void do_stats(void)
{
top_status_t *cur;
pid_t pid;
int n;
unsigned i, last_i;
struct save_hist *new_hist;
get_jiffy_counts();
total_pcpu = 0;
/* total_vsz = 0; */
new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
/*
* Make a pass through the data to get stats.
*/
/* hist_iterations = 0; */
i = 0;
for (n = 0; n < ntop; n++) {
cur = top + n;
/*
* Calculate time in cur process. Time is sum of user time
* and system time
*/
pid = cur->pid;
new_hist[n].ticks = cur->ticks;
new_hist[n].pid = pid;
/* find matching entry from previous pass */
cur->pcpu = 0;
/* do not start at index 0, continue at last used one
* (brought hist_iterations from ~14000 down to 172) */
last_i = i;
if (prev_hist_count) do {
if (prev_hist[i].pid == pid) {
cur->pcpu = cur->ticks - prev_hist[i].ticks;
total_pcpu += cur->pcpu;
break;
}
i = (i+1) % prev_hist_count;
/* hist_iterations++; */
} while (i != last_i);
/* total_vsz += cur->vsz; */
}
/*
* Save cur frame's information.
*/
free(prev_hist);
prev_hist = new_hist;
prev_hist_count = ntop;
}
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
/* formats 7 char string (8 with terminating NUL) */
static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
{
unsigned t;
if (value >= total) { /* 100% ? */
strcpy(pbuf, " 100% ");
return pbuf;
}
/* else generate " [N/space]N.N% " string */
value = 1000 * value / total;
t = value / 100;
value = value % 100;
pbuf[0] = ' ';
pbuf[1] = t ? t + '0' : ' ';
pbuf[2] = '0' + (value / 10);
pbuf[3] = '.';
pbuf[4] = '0' + (value % 10);
pbuf[5] = '%';
pbuf[6] = ' ';
pbuf[7] = '\0';
return pbuf;
}
#endif
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
{
/*
* xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
*/
unsigned total_diff;
jiffy_counts_t *p_jif, *p_prev_jif;
int i;
# if ENABLE_FEATURE_TOP_SMP_CPU
int n_cpu_lines;
# endif
/* using (unsigned) casts to make operations cheaper */
# define CALC_TOTAL_DIFF do { \
total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
if (total_diff == 0) total_diff = 1; \
} while (0)
# if ENABLE_FEATURE_TOP_DECIMALS
# define CALC_STAT(xxx) char xxx[8]
# define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
# define FMT "%s"
# else
# define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
# define SHOW_STAT(xxx) xxx
# define FMT "%4u%% "
# endif
# if !ENABLE_FEATURE_TOP_SMP_CPU
{
i = 1;
p_jif = &cur_jif;
p_prev_jif = &prev_jif;
# else
/* Loop thru CPU(s) */
n_cpu_lines = smp_cpu_info ? num_cpus : 1;
if (n_cpu_lines > *lines_rem_p)
n_cpu_lines = *lines_rem_p;
for (i = 0; i < n_cpu_lines; i++) {
p_jif = &cpu_jif[i];
p_prev_jif = &cpu_prev_jif[i];
# endif
CALC_TOTAL_DIFF;
{ /* Need a block: CALC_STAT are declarations */
CALC_STAT(usr);
CALC_STAT(sys);
CALC_STAT(nic);
CALC_STAT(idle);
CALC_STAT(iowait);
CALC_STAT(irq);
CALC_STAT(softirq);
/*CALC_STAT(steal);*/
snprintf(scrbuf, scr_width,
/* Barely fits in 79 chars when in "decimals" mode. */
# if ENABLE_FEATURE_TOP_SMP_CPU
"CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
(smp_cpu_info ? utoa(i) : ""),
# else
"CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
# endif
SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
/*, SHOW_STAT(steal) - what is this 'steal' thing? */
/* I doubt anyone wants to know it */
);
puts(scrbuf);
}
}
# undef SHOW_STAT
# undef CALC_STAT
# undef FMT
*lines_rem_p -= i;
}
#else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
# define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
#endif
enum {
MI_MEMTOTAL,
MI_MEMFREE,
MI_MEMSHARED,
MI_SHMEM,
MI_BUFFERS,
MI_CACHED,
MI_SWAPTOTAL,
MI_SWAPFREE,
MI_DIRTY,
MI_WRITEBACK,
MI_ANONPAGES,
MI_MAPPED,
MI_SLAB,
MI_MAX
};
static void parse_meminfo(unsigned long meminfo[MI_MAX])
{
static const char fields[] ALIGN1 =
"MemTotal\0"
"MemFree\0"
"MemShared\0"
"Shmem\0"
"Buffers\0"
"Cached\0"
"SwapTotal\0"
"SwapFree\0"
"Dirty\0"
"Writeback\0"
"AnonPages\0"
"Mapped\0"
"Slab\0";
char buf[60]; /* actual lines we expect are ~30 chars or less */
FILE *f;
int i;
memset(meminfo, 0, sizeof(meminfo[0]) * MI_MAX);
f = xfopen_for_read("meminfo");
while (fgets(buf, sizeof(buf), f) != NULL) {
char *c = strchr(buf, ':');
if (!c)
continue;
*c = '\0';
i = index_in_strings(fields, buf);
if (i >= 0)
meminfo[i] = strtoul(c+1, NULL, 10);
}
fclose(f);
}
static unsigned long display_header(int scr_width, int *lines_rem_p)
{
char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
char *buf;
unsigned long meminfo[MI_MAX];
parse_meminfo(meminfo);
/* Output memory info */
if (scr_width > (int)sizeof(scrbuf))
scr_width = sizeof(scrbuf);
snprintf(scrbuf, scr_width,
"Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
meminfo[MI_MEMTOTAL] - meminfo[MI_MEMFREE],
meminfo[MI_MEMFREE],
meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
meminfo[MI_BUFFERS],
meminfo[MI_CACHED]);
/* Go to top & clear to the end of screen */
printf(OPT_BATCH_MODE ? "%s\n" : ESC"[H" ESC"[J" "%s\n", scrbuf);
(*lines_rem_p)--;
/* Display CPU time split as percentage of total time.
* This displays either a cumulative line or one line per CPU.
*/
display_cpus(scr_width, scrbuf, lines_rem_p);
/* Read load average as a string */
buf = stpcpy(scrbuf, "Load average: ");
open_read_close("loadavg", buf, sizeof(scrbuf) - sizeof("Load average: "));
scrbuf[scr_width - 1] = '\0';
strchrnul(buf, '\n')[0] = '\0';
puts(scrbuf);
(*lines_rem_p)--;
return meminfo[MI_MEMTOTAL];
}
static NOINLINE void display_process_list(int lines_rem, int scr_width)
{
enum {
BITS_PER_INT = sizeof(int) * 8
};
top_status_t *s;
unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
/* xxx_shift and xxx_scale variables allow us to replace
* expensive divides with multiply and shift */
unsigned pmem_shift, pmem_scale, pmem_half;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned tmp_unsigned;
unsigned pcpu_shift, pcpu_scale, pcpu_half;
unsigned busy_jifs;
#endif
#if ENABLE_FEATURE_TOP_DECIMALS
# define UPSCALE 1000
typedef struct { unsigned quot, rem; } bb_div_t;
/* Used to have "div_t name = div((val), 10)" here
* (IOW: intended to use libc-compatible way to divide and use
* both result and remainder, but musl does not inline div()...)
* Oh well. Modern compilers detect "N/d, N%d" idiom by themselves:
*/
# define CALC_STAT(name, val) bb_div_t name = { (val) / 10, (val) % 10 }
# define SHOW_STAT(name) name.quot, '0'+name.rem
# define FMT "%3u.%c"
#else
# define UPSCALE 100
# define CALC_STAT(name, val) unsigned name = (val)
# define SHOW_STAT(name) name
# define FMT "%4u%%"
#endif
/* what info of the processes is shown */
printf(OPT_BATCH_MODE ? "%.*s" : ESC"[7m" "%.*s" ESC"[m", scr_width,
" PID PPID USER STAT VSZ %VSZ"
IF_FEATURE_TOP_SMP_PROCESS(" CPU")
IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
" COMMAND");
lines_rem--;
/*
* %VSZ = s->vsz/MemTotal
*/
pmem_shift = BITS_PER_INT-11;
pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
/* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
while (pmem_scale >= 512) {
pmem_scale /= 4;
pmem_shift -= 2;
}
pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
busy_jifs = cur_jif.busy - prev_jif.busy;
/* This happens if there were lots of short-lived processes
* between two top updates (e.g. compilation) */
if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
/*
* CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
* (pcpu is delta of sys+user time between samples)
*/
/* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
* in 0..~64000 range (HZ*update_interval).
* we assume that unsigned is at least 32-bit.
*/
pcpu_shift = 6;
pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
if (pcpu_scale == 0)
pcpu_scale = 1;
while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
pcpu_scale *= 4;
pcpu_shift += 2;
}
tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
if (tmp_unsigned != 0)
pcpu_scale /= tmp_unsigned;
/* we want (s->pcpu * pcpu_scale) to never overflow */
while (pcpu_scale >= 1024) {
pcpu_scale /= 4;
pcpu_shift -= 2;
}
pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
#endif
/* Ok, all preliminary data is ready, go through the list */
scr_width += 2; /* account for leading '\n' and trailing NUL */
if (lines_rem > ntop - G_scroll_ofs)
lines_rem = ntop - G_scroll_ofs;
s = top + G_scroll_ofs;
while (--lines_rem >= 0) {
int n;
char *ppu;
char ppubuf[sizeof(int)*3 * 2 + 12];
char vsz_str_buf[8];
unsigned col;
CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
#endif
smart_ulltoa5(s->vsz, vsz_str_buf, " mgtpezy");
/* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
n = sprintf(ppubuf, "%5u %5u %-8.8s", s->pid, s->ppid, get_cached_username(s->uid));
ppu = ppubuf;
if (n != 6+6+8) {
/* Format PID PPID USER part into 6+6+8 chars:
* shrink PID/PPID if possible, then truncate USER
*/
char *p, *pp;
if (*ppu == ' ') {
do {
ppu++, n--;
if (n == 6+6+8)
goto shortened;
} while (*ppu == ' ');
}
pp = p = skip_non_whitespace(ppu) + 1;
if (*p == ' ') {
do
p++, n--;
while (n != 6+6+8 && *p == ' ');
overlapping_strcpy(pp, p); /* shrink PPID */
}
ppu[6+6+8] = '\0'; /* truncate USER */
}
shortened:
col = snprintf(line_buf, scr_width,
"\n" "%s %s %.5s" FMT
IF_FEATURE_TOP_SMP_PROCESS(" %3d")
IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
" ",
ppu,
s->state, vsz_str_buf,
SHOW_STAT(pmem)
IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
);
if ((int)(scr_width - col) > 1)
read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
fputs_stdout(line_buf);
/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
s++;
}
/* printf(" %d", hist_iterations); */
bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
fflush_all();
}
#undef UPSCALE
#undef SHOW_STAT
#undef CALC_STAT
#undef FMT
static void clearmems(void)
{
clear_username_cache();
free(top);
top = NULL;
}
#if ENABLE_FEATURE_TOP_INTERACTIVE
static void reset_term(void)
{
if (!OPT_BATCH_MODE)
tcsetattr_stdin_TCSANOW(&initial_settings);
}
static void sig_catcher(int sig)
{
reset_term();
kill_myself_with_sig(sig);
}
#endif /* FEATURE_TOP_INTERACTIVE */
/*
* TOPMEM support
*/
typedef unsigned long mem_t;
typedef struct topmem_status_t {
unsigned pid;
char comm[COMM_LEN];
/* vsz doesn't count /dev/xxx mappings except /dev/zero */
mem_t vsz ;
mem_t vszrw ;
mem_t rss ;
mem_t rss_sh ;
mem_t dirty ;
mem_t dirty_sh;
mem_t stack ;
} topmem_status_t;
enum { NUM_SORT_FIELD = 7 };
#define topmem ((topmem_status_t*)top)
#if ENABLE_FEATURE_TOPMEM
static int topmem_sort(char *a, char *b)
{
int n;
mem_t l, r;
n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
l = *(mem_t*)(a + n);
r = *(mem_t*)(b + n);
if (l == r) {
l = ((topmem_status_t*)a)->dirty;
r = ((topmem_status_t*)b)->dirty;
}
/* We want to avoid unsigned->signed and truncation errors */
/* l>r: -1, l=r: 0, l<r: 1 */
n = (l > r) ? -1 : (l != r);
return inverted ? -n : n;
}
/* display header info (meminfo / loadavg) */
static void display_topmem_header(int scr_width, int *lines_rem_p)
{
unsigned long meminfo[MI_MAX];
parse_meminfo(meminfo);
snprintf(line_buf, LINE_BUF_SIZE,
"Mem total:%lu anon:%lu map:%lu free:%lu",
meminfo[MI_MEMTOTAL],
meminfo[MI_ANONPAGES],
meminfo[MI_MAPPED],
meminfo[MI_MEMFREE]);
printf(OPT_BATCH_MODE ? "%.*s\n" : ESC"[H" ESC"[J" "%.*s\n", scr_width, line_buf);
snprintf(line_buf, LINE_BUF_SIZE,
" slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
meminfo[MI_SLAB],
meminfo[MI_BUFFERS],
meminfo[MI_CACHED],
meminfo[MI_DIRTY],
meminfo[MI_WRITEBACK]);
printf("%.*s\n", scr_width, line_buf);
snprintf(line_buf, LINE_BUF_SIZE,
"Swap total:%lu free:%lu", // TODO: % used?
meminfo[MI_SWAPTOTAL],
meminfo[MI_SWAPFREE]);
printf("%.*s\n", scr_width, line_buf);
(*lines_rem_p) -= 3;
}
static void ulltoa6_and_space(unsigned long long ul, char buf[6])
{
/* see http://en.wikipedia.org/wiki/Tera */
smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
}
static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
{
#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
#define MIN_WIDTH sizeof(HDR_STR)
const topmem_status_t *s = topmem + G_scroll_ofs;
char *cp, ch;
display_topmem_header(scr_width, &lines_rem);
strcpy(line_buf, HDR_STR " COMMAND");
/* Mark the ^FIELD^ we sort by */
cp = &line_buf[5 + sort_field * 6];
ch = "^_"[inverted];
cp[6] = ch;
do *cp++ = ch; while (*cp == ' ');
printf(OPT_BATCH_MODE ? "%.*s" : ESC"[7m" "%.*s" ESC"[m", scr_width, line_buf);
lines_rem--;
if (lines_rem > ntop - G_scroll_ofs)
lines_rem = ntop - G_scroll_ofs;
while (--lines_rem >= 0) {
/* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
int n = sprintf(line_buf, "%5u ", s->pid);
ulltoa6_and_space(s->vsz , &line_buf[1*6]);
if (n > 7 || (n == 7 && line_buf[6] != ' '))
/* PID and VSZ are clumped together, truncate PID */
line_buf[5] = '.';
ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
ulltoa6_and_space(s->rss , &line_buf[3*6]);
ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
ulltoa6_and_space(s->dirty , &line_buf[5*6]);
ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
ulltoa6_and_space(s->stack , &line_buf[7*6]);
line_buf[8*6] = '\0';
if (scr_width > (int)MIN_WIDTH) {
read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
}
printf("\n""%.*s", scr_width, line_buf);
s++;
}
bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
fflush_all();
#undef HDR_STR
#undef MIN_WIDTH
}
#else
void display_topmem_process_list(int lines_rem, int scr_width);
int topmem_sort(char *a, char *b);
#endif /* TOPMEM */
/*
* end TOPMEM support
*/
enum {
TOP_MASK = 0
| PSSCAN_PID
| PSSCAN_PPID
| PSSCAN_VSZ
| PSSCAN_STIME
| PSSCAN_UTIME
| PSSCAN_STATE
| PSSCAN_COMM
| PSSCAN_CPU
| PSSCAN_UIDGID,
TOPMEM_MASK = 0
| PSSCAN_PID
| PSSCAN_SMAPS
| PSSCAN_COMM,
EXIT_MASK = 0,
NO_RESCAN_MASK = (unsigned)-1,
};
#if ENABLE_FEATURE_TOP_INTERACTIVE
static unsigned handle_input(unsigned scan_mask, duration_t interval)
{
if (option_mask32 & OPT_EOF) {
/* EOF on stdin ("top </dev/null") */
sleep_for_duration(interval);
return scan_mask;
}
while (1) {
int32_t c;
c = safe_read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
if (c == -1 && errno != EAGAIN) {
/* error/EOF */
option_mask32 |= OPT_EOF;
break;
}
interval = 0;
if (c == initial_settings.c_cc[VINTR])
return EXIT_MASK;
if (c == initial_settings.c_cc[VEOF])
return EXIT_MASK;
if (c == KEYCODE_UP) {
G_scroll_ofs--;
goto normalize_ofs;
}
if (c == KEYCODE_DOWN) {
G_scroll_ofs++;
goto normalize_ofs;
}
if (c == KEYCODE_HOME) {
G_scroll_ofs = 0;
goto normalize_ofs;
}
if (c == KEYCODE_END) {
G_scroll_ofs = ntop - G.lines / 2;
goto normalize_ofs;
}
if (c == KEYCODE_PAGEUP) {
G_scroll_ofs -= G.lines / 2;
goto normalize_ofs;
}
if (c == KEYCODE_PAGEDOWN) {
G_scroll_ofs += G.lines / 2;
normalize_ofs:
if (G_scroll_ofs >= ntop)
G_scroll_ofs = ntop - 1;
if (G_scroll_ofs < 0)
G_scroll_ofs = 0;
return NO_RESCAN_MASK;
}
c |= 0x20; /* lowercase */
if (c == 'q')
return EXIT_MASK;
if (c == 'n') {