1 /* Linux-specific functions to retrieve OS data.
3 Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "linux-osdata.h"
28 #include <sys/types.h>
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
43 #include "xml-utils.h"
45 #include "gdb_assert.h"
46 #include "gdb_dirent.h"
49 linux_common_core_of_thread (ptid_t ptid)
51 char filename[sizeof ("/proc//task//stat")
52 + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */
62 sprintf (filename, "/proc/%d/task/%ld/stat",
63 ptid_get_pid (ptid), ptid_get_lwp (ptid));
64 f = fopen (filename, "r");
71 content = xrealloc (content, content_read + 1024);
72 n = fread (content + content_read, 1, 1024, f);
76 content[content_read] = '\0';
81 p = strchr (content, '(');
89 /* If the first field after program name has index 0, then core number is
90 the field with index 36. There's no constant for that anywhere. */
92 p = strtok_r (p, " ", &ts);
93 for (i = 0; p != NULL && i != 36; ++i)
94 p = strtok_r (NULL, " ", &ts);
96 if (p == NULL || sscanf (p, "%d", &core) == 0)
106 command_from_pid (char *command, int maxlen, pid_t pid)
108 char *stat_path = xstrprintf ("/proc/%d/stat", pid);
109 FILE *fp = fopen (stat_path, "r");
115 /* sizeof (cmd) should be greater or equal to TASK_COMM_LEN (in
116 include/linux/sched.h in the Linux kernel sources) plus two
117 (for the brackets). */
120 int items_read = fscanf (fp, "%d %32s", &stat_pid, cmd);
122 if (items_read == 2 && pid == stat_pid)
124 cmd[strlen (cmd) - 1] = '\0'; /* Remove trailing parenthesis. */
125 strncpy (command, cmd + 1, maxlen); /* Ignore leading parenthesis. */
132 /* Return the PID if a /proc entry for the process cannot be found. */
133 snprintf (command, maxlen, "%d", pid);
136 command[maxlen - 1] = '\0'; /* Ensure string is null-terminated. */
141 /* Returns the command-line of the process with the given PID. The returned
142 string needs to be freed using xfree after use. */
145 commandline_from_pid (pid_t pid)
147 char *pathname = xstrprintf ("/proc/%d/cmdline", pid);
148 char *commandline = NULL;
149 FILE *f = fopen (pathname, "r");
158 size_t read_bytes = fread (buf, 1, sizeof (buf), f);
162 commandline = (char *) xrealloc (commandline, len + read_bytes + 1);
163 memcpy (commandline + len, buf, read_bytes);
174 /* Replace null characters with spaces. */
175 for (i = 0; i < len; ++i)
176 if (commandline[i] == '\0')
177 commandline[i] = ' ';
179 commandline[len] = '\0';
183 /* Return the command in square brackets if the command-line is empty. */
184 commandline = (char *) xmalloc (32);
185 commandline[0] = '[';
186 command_from_pid (commandline + 1, 31, pid);
188 len = strlen (commandline);
190 strcat (commandline, "]");
200 user_from_uid (char *user, int maxlen, uid_t uid)
202 struct passwd *pwentry = getpwuid (uid);
206 strncpy (user, pwentry->pw_name, maxlen);
207 user[maxlen - 1] = '\0'; /* Ensure that the user name is null-terminated. */
214 get_process_owner (uid_t *owner, pid_t pid)
217 char procentry[sizeof ("/proc/4294967295")];
219 sprintf (procentry, "/proc/%d", pid);
221 if (stat (procentry, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
223 *owner = statbuf.st_uid;
231 get_number_of_cpu_cores (void)
234 FILE *f = fopen ("/proc/cpuinfo", "r");
239 char *p = fgets (buf, sizeof (buf), f);
241 if (p && strncmp (buf, "processor", 9) == 0)
250 /* CORES points to an array of at least get_number_of_cpu_cores () elements. */
253 get_cores_used_by_process (pid_t pid, int *cores)
255 char taskdir[sizeof ("/proc/4294967295/task")];
260 sprintf (taskdir, "/proc/%d/task", pid);
261 dir = opendir (taskdir);
264 while ((dp = readdir (dir)) != NULL)
269 if (!isdigit (dp->d_name[0])
270 || NAMELEN (dp) > sizeof ("4294967295") - 1)
273 tid = atoi (dp->d_name);
274 core = linux_common_core_of_thread (ptid_build (pid, tid, 0));
290 linux_xfer_osdata_processes (gdb_byte *readbuf,
291 ULONGEST offset, LONGEST len)
293 /* We make the process list snapshot when the object starts to be read. */
294 static const char *buf;
295 static LONGEST len_avail = -1;
296 static struct buffer buffer;
302 if (len_avail != -1 && len_avail != 0)
303 buffer_free (&buffer);
306 buffer_init (&buffer);
307 buffer_grow_str (&buffer, "<osdata type=\"processes\">\n");
309 dirp = opendir ("/proc");
312 const int num_cores = get_number_of_cpu_cores ();
315 while ((dp = readdir (dirp)) != NULL)
319 char user[UT_NAMESIZE];
326 if (!isdigit (dp->d_name[0])
327 || NAMELEN (dp) > sizeof ("4294967295") - 1)
330 sscanf (dp->d_name, "%d", &pid);
331 command_line = commandline_from_pid (pid);
333 if (get_process_owner (&owner, pid) == 0)
334 user_from_uid (user, sizeof (user), owner);
338 /* Find CPU cores used by the process. */
339 cores = (int *) xcalloc (num_cores, sizeof (int));
340 task_count = get_cores_used_by_process (pid, cores);
341 cores_str = (char *) xcalloc (task_count, sizeof ("4294967295") + 1);
343 for (i = 0; i < num_cores && task_count > 0; ++i)
346 char core_str[sizeof ("4294967205")];
348 sprintf (core_str, "%d", i);
349 strcat (cores_str, core_str);
351 task_count -= cores[i];
353 strcat (cores_str, ",");
361 "<column name=\"pid\">%d</column>"
362 "<column name=\"user\">%s</column>"
363 "<column name=\"command\">%s</column>"
364 "<column name=\"cores\">%s</column>"
368 command_line ? command_line : "",
371 xfree (command_line);
378 buffer_grow_str0 (&buffer, "</osdata>\n");
379 buf = buffer_finish (&buffer);
380 len_avail = strlen (buf);
383 if (offset >= len_avail)
385 /* Done. Get rid of the buffer. */
386 buffer_free (&buffer);
392 if (len > len_avail - offset)
393 len = len_avail - offset;
394 memcpy (readbuf, buf + offset, len);
400 linux_xfer_osdata_threads (gdb_byte *readbuf,
401 ULONGEST offset, LONGEST len)
403 /* We make the process list snapshot when the object starts to be read. */
404 static const char *buf;
405 static LONGEST len_avail = -1;
406 static struct buffer buffer;
412 if (len_avail != -1 && len_avail != 0)
413 buffer_free (&buffer);
416 buffer_init (&buffer);
417 buffer_grow_str (&buffer, "<osdata type=\"threads\">\n");
419 dirp = opendir ("/proc");
424 while ((dp = readdir (dirp)) != NULL)
427 char procentry[sizeof ("/proc/4294967295")];
429 if (!isdigit (dp->d_name[0])
430 || NAMELEN (dp) > sizeof ("4294967295") - 1)
433 sprintf (procentry, "/proc/%s", dp->d_name);
434 if (stat (procentry, &statbuf) == 0
435 && S_ISDIR (statbuf.st_mode))
442 pathname = xstrprintf ("/proc/%s/task", dp->d_name);
444 pid = atoi (dp->d_name);
445 command_from_pid (command, sizeof (command), pid);
447 dirp2 = opendir (pathname);
453 while ((dp2 = readdir (dirp2)) != NULL)
458 if (!isdigit (dp2->d_name[0])
459 || NAMELEN (dp2) > sizeof ("4294967295") - 1)
462 tid = atoi (dp2->d_name);
463 core = linux_common_core_of_thread (ptid_build (pid, tid, 0));
468 "<column name=\"pid\">%d</column>"
469 "<column name=\"command\">%s</column>"
470 "<column name=\"tid\">%d</column>"
471 "<column name=\"core\">%d</column>"
489 buffer_grow_str0 (&buffer, "</osdata>\n");
490 buf = buffer_finish (&buffer);
491 len_avail = strlen (buf);
494 if (offset >= len_avail)
496 /* Done. Get rid of the buffer. */
497 buffer_free (&buffer);
503 if (len > len_avail - offset)
504 len = len_avail - offset;
505 memcpy (readbuf, buf + offset, len);
513 LONGEST (*getter) (gdb_byte *readbuf, ULONGEST offset, LONGEST len);
515 { "processes", "Listing of all processes", linux_xfer_osdata_processes },
516 { "threads", "Listing of all threads", linux_xfer_osdata_threads },
521 linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf,
522 ULONGEST offset, LONGEST len)
524 if (!annex || *annex == '\0')
526 static const char *buf;
527 static LONGEST len_avail = -1;
528 static struct buffer buffer;
534 if (len_avail != -1 && len_avail != 0)
535 buffer_free (&buffer);
538 buffer_init (&buffer);
539 buffer_grow_str (&buffer, "<osdata type=\"types\">\n");
541 for (i = 0; osdata_table[i].type; ++i)
545 "<column name=\"Type\">%s</column>"
546 "<column name=\"Description\">%s</column>"
548 osdata_table[i].type,
549 osdata_table[i].description);
551 buffer_grow_str0 (&buffer, "</osdata>\n");
552 buf = buffer_finish (&buffer);
553 len_avail = strlen (buf);
556 if (offset >= len_avail)
558 /* Done. Get rid of the buffer. */
559 buffer_free (&buffer);
565 if (len > len_avail - offset)
566 len = len_avail - offset;
567 memcpy (readbuf, buf + offset, len);
575 for (i = 0; osdata_table[i].type; ++i)
577 if (strcmp (annex, osdata_table[i].type) == 0)
579 gdb_assert (readbuf);
581 return (osdata_table[i].getter) (readbuf, offset, len);