summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/procps/top.c
diff options
context:
space:
mode:
Diffstat (limited to 'i/pc104/initrd/conf/busybox/procps/top.c')
-rw-r--r--i/pc104/initrd/conf/busybox/procps/top.c570
1 files changed, 570 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/procps/top.c b/i/pc104/initrd/conf/busybox/procps/top.c
new file mode 100644
index 0000000..ee6ee5d
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/procps/top.c
@@ -0,0 +1,570 @@
+/* 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>
+ */
+
+/* Original code Copyrights */
+/*
+ * Copyright (c) 1992 Branko Lankester
+ * Copyright (c) 1992 Roger Binns
+ * Copyright (C) 1994-1996 Charles L. Blake.
+ * Copyright (C) 1992-1998 Michael K. Johnson
+ * May be distributed under the conditions of the
+ * GNU Library General Public License
+ */
+
+#include "busybox.h"
+
+
+typedef struct {
+ 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];
+} top_status_t;
+static top_status_t *top;
+static int ntop;
+/* This structure stores some critical information from one frame to
+ the next. Used for finding deltas. */
+struct save_hist {
+ unsigned long ticks;
+ unsigned pid;
+};
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+static struct save_hist *prev_hist;
+static int prev_hist_count;
+/* static int hist_iterations; */
+static unsigned total_pcpu;
+/* static unsigned long total_vsz; */
+#endif
+
+#define OPT_BATCH_MODE (option_mask32 & 0x4)
+
+#if ENABLE_FEATURE_USE_TERMIOS
+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 > */
+}
+
+
+typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
+
+#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+
+static cmp_funcp sort_function;
+
+#else
+
+enum { SORT_DEPTH = 3 };
+
+static cmp_funcp sort_function[SORT_DEPTH];
+
+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)
+ return cmp_val;
+ }
+ return 0;
+}
+
+
+typedef struct {
+ unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
+ unsigned long long total;
+ unsigned long long busy;
+} jiffy_counts_t;
+static jiffy_counts_t jif, prev_jif;
+static void get_jiffy_counts(void)
+{
+ FILE* fp = xfopen("stat", "r");
+ prev_jif = jif;
+ if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
+ &jif.usr,&jif.nic,&jif.sys,&jif.idle,
+ &jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
+ bb_error_msg_and_die("failed to read /proc/stat");
+ }
+ fclose(fp);
+ jif.total = jif.usr + jif.nic + jif.sys + jif.idle
+ + jif.iowait + jif.irq + jif.softirq + jif.steal;
+ /* procps 2.x does not count iowait as busy time */
+ jif.busy = jif.total - jif.idle - jif.iowait;
+}
+
+
+static void do_stats(void)
+{
+ top_status_t *cur;
+ pid_t pid;
+ int i, last_i, n;
+ struct save_hist *new_hist;
+
+ get_jiffy_counts();
+ total_pcpu = 0;
+ /* total_vsz = 0; */
+ new_hist = xmalloc(sizeof(struct save_hist)*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 */
+
+
+/* display generic info (meminfo / loadavg) */
+static unsigned long display_generic(int scr_width)
+{
+ FILE *fp;
+ char buf[80];
+ char scrbuf[80];
+ char *end;
+ unsigned long total, used, mfree, shared, buffers, cached;
+ unsigned int needs_conversion = 1;
+
+ /* read memory info */
+ fp = xfopen("meminfo", "r");
+
+ /*
+ * Old kernels (such as 2.4.x) had a nice summary of memory info that
+ * we could parse, however this is gone entirely in 2.6. Try parsing
+ * the old way first, and if that fails, parse each field manually.
+ *
+ * First, we read in the first line. Old kernels will have bogus
+ * strings we don't care about, whereas new kernels will start right
+ * out with MemTotal:
+ * -- PFM.
+ */
+ if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
+ fgets(buf, sizeof(buf), fp); /* skip first line */
+
+ fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
+ &total, &used, &mfree, &shared, &buffers, &cached);
+ } else {
+ /*
+ * Revert to manual parsing, which incidentally already has the
+ * sizes in kilobytes. This should be safe for both 2.4 and
+ * 2.6.
+ */
+ needs_conversion = 0;
+
+ fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
+
+ /*
+ * MemShared: is no longer present in 2.6. Report this as 0,
+ * to maintain consistent behavior with normal procps.
+ */
+ if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
+ shared = 0;
+
+ fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
+ fscanf(fp, "Cached: %lu %s\n", &cached, buf);
+
+ used = total - mfree;
+ }
+ fclose(fp);
+
+ /* read load average as a string */
+ buf[0] = '\0';
+ open_read_close("loadavg", buf, sizeof(buf));
+ end = strchr(buf, ' ');
+ if (end) end = strchr(end+1, ' ');
+ if (end) end = strchr(end+1, ' ');
+ if (end) *end = '\0';
+
+ if (needs_conversion) {
+ /* convert to kilobytes */
+ used /= 1024;
+ mfree /= 1024;
+ shared /= 1024;
+ buffers /= 1024;
+ cached /= 1024;
+ total /= 1024;
+ }
+
+ /* output memory info and load average */
+ /* clear screen & go to top */
+ if (scr_width > sizeof(scrbuf))
+ scr_width = sizeof(scrbuf);
+ snprintf(scrbuf, scr_width,
+ "Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
+ used, mfree, shared, buffers, cached);
+
+ printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
+
+ snprintf(scrbuf, scr_width, "Load average: %s", buf);
+ printf("%s\n", scrbuf);
+
+ return total;
+}
+
+
+/* display process statuses */
+static void display_status(int count, int scr_width)
+{
+ enum {
+ bits_per_int = sizeof(int)*8
+ };
+
+ top_status_t *s = top;
+ char vsz_str_buf[8];
+ unsigned long total_memory = display_generic(scr_width); /* or use total_vsz? */
+ unsigned pmem_shift, pmem_scale;
+
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ unsigned pcpu_shift, pcpu_scale;
+ unsigned busy_jifs;
+
+ /* what info of the processes is shown */
+ printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
+ " PID USER STATUS VSZ PPID %CPU %MEM COMMAND");
+#define MIN_WIDTH \
+ sizeof( " PID USER STATUS VSZ PPID %CPU %MEM C")
+#else
+ printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
+ " PID USER STATUS VSZ PPID %MEM COMMAND");
+#define MIN_WIDTH \
+ sizeof( " PID USER STATUS VSZ PPID %MEM C")
+#endif
+
+ /*
+ * MEM% = s->vsz/MemTotal
+ */
+ pmem_shift = bits_per_int-11;
+ pmem_scale = 1000*(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;
+ }
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ busy_jifs = 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)
+ */
+ /* (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 = (1000*64*(uint16_t)busy_jifs ? : 1);
+ while (pcpu_scale < (1U<<(bits_per_int-2))) {
+ pcpu_scale *= 4;
+ pcpu_shift += 2;
+ }
+ pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
+ /* we want (s->pcpu * pcpu_scale) to never overflow */
+ while (pcpu_scale >= 1024) {
+ pcpu_scale /= 4;
+ pcpu_shift -= 2;
+ }
+ /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
+#endif
+ while (count-- > 0) {
+ div_t pmem = div((s->vsz*pmem_scale) >> pmem_shift, 10);
+ int col = scr_width+1;
+ USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
+
+ if (s->vsz >= 100*1024)
+ sprintf(vsz_str_buf, "%6ldM", s->vsz/1024);
+ else
+ sprintf(vsz_str_buf, "%7ld", s->vsz);
+ USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(
+ pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);
+ )
+ col -= printf("\n%5u %-8s %s "
+ "%s%6u"
+ USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c")
+ "%3u.%c ",
+ s->pid, get_cached_username(s->uid), s->state,
+ vsz_str_buf, s->ppid,
+ USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
+ pmem.quot, '0'+pmem.rem);
+ if (col > 0)
+ printf("%.*s", col, s->comm);
+ /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
+ jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
+ s++;
+ }
+ /* printf(" %d", hist_iterations); */
+ putchar(OPT_BATCH_MODE ? '\n' : '\r');
+ fflush(stdout);
+}
+
+
+static void clearmems(void)
+{
+ clear_username_cache();
+ free(top);
+ top = 0;
+ ntop = 0;
+}
+
+
+#if ENABLE_FEATURE_USE_TERMIOS
+#include <termios.h>
+#include <signal.h>
+
+static struct termios initial_settings;
+
+static void reset_term(void)
+{
+ tcsetattr(0, TCSANOW, (void *) &initial_settings);
+#if ENABLE_FEATURE_CLEAN_UP
+ clearmems();
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ free(prev_hist);
+#endif
+#endif /* FEATURE_CLEAN_UP */
+}
+
+static void sig_catcher(int sig ATTRIBUTE_UNUSED)
+{
+ reset_term();
+ exit(1);
+}
+#endif /* FEATURE_USE_TERMIOS */
+
+
+int top_main(int argc, char **argv);
+int top_main(int argc, char **argv)
+{
+ int count, lines, col;
+ unsigned interval = 5; /* default update rate is 5 seconds */
+ unsigned iterations = UINT_MAX; /* 2^32 iterations by default :) */
+ char *sinterval, *siterations;
+#if ENABLE_FEATURE_USE_TERMIOS
+ struct termios new_settings;
+ struct timeval tv;
+ fd_set readfds;
+ unsigned char c;
+#endif /* FEATURE_USE_TERMIOS */
+
+ /* do normal option parsing */
+ interval = 5;
+ opt_complementary = "-";
+ getopt32(argc, argv, "d:n:b", &sinterval, &siterations);
+ if (option_mask32 & 0x1) interval = xatou(sinterval); // -d
+ if (option_mask32 & 0x2) iterations = xatou(siterations); // -n
+ //if (option_mask32 & 0x4) // -b
+
+ /* change to /proc */
+ xchdir("/proc");
+#if ENABLE_FEATURE_USE_TERMIOS
+ tcgetattr(0, (void *) &initial_settings);
+ memcpy(&new_settings, &initial_settings, sizeof(struct termios));
+ /* unbuffered input, turn off echo */
+ new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
+
+ signal(SIGTERM, sig_catcher);
+ signal(SIGINT, sig_catcher);
+ tcsetattr(0, TCSANOW, (void *) &new_settings);
+ atexit(reset_term);
+#endif /* FEATURE_USE_TERMIOS */
+
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ sort_function[0] = pcpu_sort;
+ sort_function[1] = mem_sort;
+ sort_function[2] = time_sort;
+#else
+ sort_function = mem_sort;
+#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
+
+ while (1) {
+ procps_status_t *p = NULL;
+
+ /* Default to 25 lines - 5 lines for status */
+ lines = 24 - 3;
+ col = 79;
+#if ENABLE_FEATURE_USE_TERMIOS
+ get_terminal_width_height(0, &col, &lines);
+ if (lines < 5 || col < MIN_WIDTH) {
+ sleep(interval);
+ continue;
+ }
+ lines -= 3;
+#endif /* FEATURE_USE_TERMIOS */
+
+ /* read process IDs & status for all the processes */
+ while ((p = procps_scan(p, 0
+ | PSSCAN_PID
+ | PSSCAN_PPID
+ | PSSCAN_VSZ
+ | PSSCAN_STIME
+ | PSSCAN_UTIME
+ | PSSCAN_STATE
+ | PSSCAN_COMM
+ | PSSCAN_SID
+ | PSSCAN_UIDGID
+ ))) {
+ int n = ntop;
+ top = xrealloc(top, (++ntop)*sizeof(top_status_t));
+ top[n].pid = p->pid;
+ top[n].ppid = p->ppid;
+ top[n].vsz = p->vsz;
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ top[n].ticks = p->stime + p->utime;
+#endif
+ top[n].uid = p->uid;
+ strcpy(top[n].state, p->state);
+ strcpy(top[n].comm, p->comm);
+ }
+ if (ntop == 0) {
+ bb_error_msg_and_die("can't find process info in /proc");
+ }
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ if (!prev_hist_count) {
+ do_stats();
+ sleep(1);
+ clearmems();
+ continue;
+ }
+ do_stats();
+ qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
+#else
+ qsort(top, ntop, sizeof(top_status_t), (void*)sort_function);
+#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
+ count = lines;
+ if (OPT_BATCH_MODE || count > ntop) {
+ count = ntop;
+ }
+ /* show status for each of the processes */
+ display_status(count, col);
+#if ENABLE_FEATURE_USE_TERMIOS
+ tv.tv_sec = interval;
+ tv.tv_usec = 0;
+ FD_ZERO(&readfds);
+ FD_SET(0, &readfds);
+ select(1, &readfds, NULL, NULL, &tv);
+ if (FD_ISSET(0, &readfds)) {
+ if (read(0, &c, 1) <= 0) { /* signal */
+ return EXIT_FAILURE;
+ }
+ if (c == 'q' || c == initial_settings.c_cc[VINTR])
+ break;
+ if (c == 'M') {
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ sort_function[0] = mem_sort;
+ sort_function[1] = pcpu_sort;
+ sort_function[2] = time_sort;
+#else
+ sort_function = mem_sort;
+#endif
+ }
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ if (c == 'P') {
+ sort_function[0] = pcpu_sort;
+ sort_function[1] = mem_sort;
+ sort_function[2] = time_sort;
+ }
+ if (c == 'T') {
+ sort_function[0] = time_sort;
+ sort_function[1] = mem_sort;
+ sort_function[2] = pcpu_sort;
+ }
+#endif
+ if (c == 'N') {
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ sort_function[0] = pid_sort;
+#else
+ sort_function = pid_sort;
+#endif
+ }
+ }
+ if (!--iterations)
+ break;
+#else
+ sleep(interval);
+#endif /* FEATURE_USE_TERMIOS */
+ clearmems();
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ clearmems();
+ putchar('\n');
+ return EXIT_SUCCESS;
+}