From 8b5c671958071ee2a9967551f0490623b73e30b5 Mon Sep 17 00:00:00 2001
From: Ashwini Sharma <ak.ashwini@gmail.com>
Date: Tue, 27 Aug 2013 03:31:27 -0500
Subject: Add pmap.

---
 toys/pending/pmap.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 toys/pending/pmap.c

(limited to 'toys/pending')

diff --git a/toys/pending/pmap.c b/toys/pending/pmap.c
new file mode 100644
index 00000000..7d54c430
--- /dev/null
+++ b/toys/pending/pmap.c
@@ -0,0 +1,128 @@
+/* pmap.c - Reports the memory map of a process or processes.
+ *
+ * Copyright 2013 Ranjan Kumar <ranjankumar.bth@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard.
+ *
+USE_PMAP(NEWTOY(pmap, "xq", TOYFLAG_BIN))
+
+config PMAP
+  bool "pmap"
+  default y
+  help
+    usage: pmap [-xq] [pids...]
+
+    Reports the memory map of a process or processes.
+
+    -x Show the extended format.
+    -q Do not display some header/footer lines.
+*/
+#define FOR_pmap
+#include "toys.h"
+
+#if ULONG_MAX == 0xffffffff
+ # define TAB "\t"
+ # define WIDTH "8"
+ # define DASHES ""
+#else
+ # define TAB "\t\t"
+ # define WIDTH "16"
+ # define DASHES "--------"
+#endif
+
+struct _smaps {
+  unsigned long start_addr, size, pss, pdirty, swap;
+  char mode[5], *mapping;
+};
+
+//Display mapping info.
+static void show_maps(struct _smaps *map)
+{
+  xprintf("%0" WIDTH "lx ", map->start_addr);
+  if (toys.optflags & FLAG_x)
+    xprintf("%7lu %7lu %7lu %7lu ", map->size, map->pss, map->pdirty, map->swap);
+  else xprintf("%7luK", map->size);
+  xprintf(" %.4s  \n", map->mode, map->mapping);
+  free(map->mapping);
+}
+
+//Read "/proc/pid/smaps" file and extract data.
+static int read_smaps(pid_t pid, struct _smaps *total)
+{
+  struct _smaps curmap;
+  char *line;
+  int fd, nitems;
+  
+  snprintf(toybuf, sizeof(toybuf), "/proc/%u/smaps", pid);
+  if ((fd = open(toybuf, O_RDONLY)) < 0) return fd;
+  memset(&curmap, 0, sizeof(struct _smaps)); 
+  while ((line = get_line(fd))) {
+    char *ptr = NULL;
+    *toybuf = *(toybuf+34) = *(toybuf+40) = '\0';
+    //1st line format -> start_addr-End_addr rw-s ADR M:m OFS
+    if ((ptr = strchr(line, '-'))) {
+      if (curmap.size) show_maps(&curmap);
+      memset(&curmap, 0, sizeof(struct _smaps));
+      nitems = sscanf(line, "%s %s %*s %*s %*s %s\n", toybuf, toybuf+34, toybuf+40);
+      if (nitems >= 2) {
+        ptr = strchr(toybuf, '-');
+        *ptr = '\0';
+        total->size += curmap.size = (strtoul(++ptr, NULL, 16) - 
+            (curmap.start_addr = strtoul(toybuf, NULL, 16))) >> 10;
+        strncpy(curmap.mode, toybuf+34, sizeof(curmap.mode)-1);
+        if (!*(toybuf+40)) curmap.mapping = xstrdup("  [ anon ]");
+        else curmap.mapping = xstrdup(toybuf+40);
+      }
+    } else { //2nd line onwards..
+      unsigned long val = 0;
+      nitems = sscanf(line, "%s %lu\n", toybuf, &val);
+      if (nitems == 2) {
+        if (!strcmp("Pss:", toybuf)) total->pss += (curmap.pss = val);
+        else if (!strcmp("Private_Dirty:", toybuf)) total->pdirty += (curmap.pdirty = val);
+        else if (!strcmp("Swap:", toybuf)) total->swap += (curmap.swap = val);
+      }
+    }
+    free(line);
+  }
+  if (curmap.size) show_maps(&curmap);
+  xclose(fd);
+  return 0;
+}
+
+void pmap_main(void)
+{
+  struct _smaps total;
+  int fd;
+  
+  while (*toys.optargs) {
+    pid_t pid = get_int_value(*toys.optargs++, 0, INT_MAX);
+    snprintf(toybuf, sizeof(toybuf), "/proc/%u/cmdline", pid);
+    if ((fd = open(toybuf, O_RDONLY)) == -1) xprintf("%u: [no such process]\n", pid);
+    else {
+      ssize_t len = readall(fd, toybuf, sizeof(toybuf) -1);
+      if (len <= 0) xprintf("%u: [no such process]\n", (int)pid);
+      else {
+        toybuf[len] = '\0';
+        while (--len >= 0 && toybuf[len] == '\0') continue;
+        for (; len > 0; len--)
+          if ((unsigned char)toybuf[len] < ' ') toybuf[len] = ' ';
+        xprintf("%u: %s\n", (int)pid, toybuf);
+      }
+      xclose(fd);
+    }
+    if (!(toys.optflags & FLAG_q) && (toys.optflags & FLAG_x))
+      xprintf("Address" TAB "  Kbytes     PSS   Dirty    Swap  Mode  Mapping\n");
+
+    memset(&total, 0, sizeof(struct _smaps));
+    if (read_smaps(pid, &total)) toys.exitval = 42;
+    else { //to display total mapping.
+      if (!(toys.optflags & FLAG_q) )
+        (toys.optflags & FLAG_x)
+          ? xprintf("--------" DASHES "  ------  ------  ------  ------\n"
+              "total" TAB " %7lu %7lu %7lu %7lu\n",
+              total.size, total.pss, total.pdirty, total.swap)
+          : xprintf("mapped: %luK\n", total.size);
+    }
+  }
+}
-- 
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