--- /dev/null
+/*
+ * Copyright (c) 2010, The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google, Inc. nor the names of its contributors
+ * may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define BUF_MAX 1024
+#define CMD_DISPLAY_MAX 10
+
+struct pid_info_t {
+ pid_t pid;
+
+ char cmdline[CMD_DISPLAY_MAX];
+
+ char path[PATH_MAX];
+ ssize_t parent_length;
+};
+
+void print_header()
+{
+ printf("%-9s %5s %10s %4s %9s %18s %9s %10s %s\n",
+ "COMMAND",
+ "PID",
+ "USER",
+ "FD",
+ "TYPE",
+ "DEVICE",
+ "SIZE/OFF",
+ "NODE",
+ "NAME");
+}
+
+void print_type(char *type, struct pid_info_t* info)
+{
+ static ssize_t link_dest_size;
+ static char link_dest[PATH_MAX];
+
+ strncat(info->path, type, sizeof(info->path));
+ if ((link_dest_size = readlink(info->path, link_dest, sizeof(link_dest)-1)) < 0) {
+ if (errno == ENOENT)
+ goto out;
+
+ snprintf(link_dest, sizeof(link_dest), "%s (readlink: %s)", info->path, strerror(errno));
+ } else {
+ link_dest[link_dest_size] = '\0';
+ }
+
+ // Things that are just the root filesystem are uninteresting (we already know)
+ if (!strcmp(link_dest, "/"))
+ goto out;
+
+ printf("%-9s %5d %10s %4s %9s %18s %9s %10s %s\n", info->cmdline, info->pid, "???", type,
+ "???", "???", "???", "???", link_dest);
+
+out:
+ info->path[info->parent_length] = '\0';
+}
+
+// Prints out all file that have been memory mapped
+void print_maps(struct pid_info_t* info)
+{
+ FILE *maps;
+ char buffer[PATH_MAX + 100];
+
+ size_t offset;
+ int major, minor;
+ char device[10];
+ long int inode;
+ char file[PATH_MAX];
+
+ strncat(info->path, "maps", sizeof(info->path));
+
+ maps = fopen(info->path, "r");
+ if (!maps)
+ goto out;
+
+ while (fscanf(maps, "%*x-%*x %*s %zx %5s %ld %s\n", &offset, device, &inode,
+ file) == 4) {
+ // We don't care about non-file maps
+ if (inode == 0 || !strcmp(device, "00:00"))
+ continue;
+
+ printf("%-9s %5d %10s %4s %9s %18s %9zd %10ld %s\n", info->cmdline, info->pid, "???", "mem",
+ "???", device, offset, inode, file);
+ }
+
+ fclose(maps);
+
+out:
+ info->path[info->parent_length] = '\0';
+}
+
+// Prints out all open file descriptors
+void print_fds(struct pid_info_t* info)
+{
+ static char* fd_path = "fd/";
+ strncat(info->path, fd_path, sizeof(info->path));
+
+ int previous_length = info->parent_length;
+ info->parent_length += strlen(fd_path);
+
+ DIR *dir = opendir(info->path);
+ if (dir == NULL) {
+ char msg[BUF_MAX];
+ snprintf(msg, sizeof(msg), "%s (opendir: %s)", info->path, strerror(errno));
+ printf("%-9s %5d %10s %4s %9s %18s %9s %10s %s\n", info->cmdline, info->pid, "???", "FDS",
+ "", "", "", "", msg);
+ goto out;
+ }
+
+ struct dirent* de;
+ while ((de = readdir(dir))) {
+ if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
+ continue;
+
+ print_type(de->d_name, info);
+ }
+ closedir(dir);
+
+out:
+ info->parent_length = previous_length;
+ info->path[info->parent_length] = '\0';
+}
+
+void lsof_dumpinfo(pid_t pid)
+{
+ int fd;
+ struct pid_info_t info;
+ info.pid = pid;
+
+ snprintf(info.path, sizeof(info.path), "/proc/%d/", pid);
+
+ info.parent_length = strlen(info.path);
+
+ // Read the command line information; each argument is terminated with NULL.
+ strncat(info.path, "cmdline", sizeof(info.path));
+ fd = open(info.path, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "Couldn't read %s\n", info.path);
+ return;
+ }
+ char cmdline[PATH_MAX];
+ if (read(fd, cmdline, sizeof(cmdline)) < 0) {
+ fprintf(stderr, "Error reading cmdline: %s: %s\n", info.path, strerror(errno));
+ close(fd);
+ return;
+ }
+ close(fd);
+ info.path[info.parent_length] = '\0';
+
+ // We only want the basename of the cmdline
+ strncpy(info.cmdline, basename(cmdline), sizeof(info.cmdline));
+ info.cmdline[sizeof(info.cmdline)-1] = '\0';
+
+ // Read each of these symlinks
+ print_type("cwd", &info);
+ print_type("exe", &info);
+ print_type("root", &info);
+
+ print_fds(&info);
+ print_maps(&info);
+}
+
+int lsof_main(int argc, char *argv[])
+{
+ DIR *dir = opendir("/proc");
+ if (dir == NULL) {
+ fprintf(stderr, "Couldn't open /proc\n");
+ return -1;
+ }
+
+ print_header();
+
+ struct dirent* de;
+ while ((de = readdir(dir))) {
+ if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
+ continue;
+
+ // Only inspect directories that are PID numbers
+ char* endptr;
+ long int pid = strtol(de->d_name, &endptr, 10);
+ if (*endptr != '\0')
+ continue;
+
+ lsof_dumpinfo(pid);
+ }
+ closedir(dir);
+
+ return 0;
+}
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