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binutils-gdb/gdb/nat/linux-osdata.c
Sergei Trofimovich 486f9e20e0 gdb/nat/linux-osdata.c: fix build on gcc-12 (string overfow) 
On gcc-12 build fails as:

    ../../gdbserver/../gdb/nat/linux-osdata.c: In function 'void linux_xfer_osdata_processes(buffer*)':
    ../../gdbserver/../gdb/nat/linux-osdata.c:330:39: error:
      '__builtin___sprintf_chk' may write a terminating nul past the end of the destination [-Werror=format-overflow=]
      330 |                 sprintf (core_str, "%d", i);
          |                                       ^

It's an off-by-one case in an infeasible scenario for negative
huge core count. The change switches to std::string for memory
handling.

Tested by running 'info os processes' and checking CPU cores column.
2021-11-17 08:13:18 +00:00

1394 lines
34 KiB
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/* Linux-specific functions to retrieve OS data.
Copyright (C) 2009-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "gdbsupport/common-defs.h"
#include "linux-osdata.h"
#include <sys/types.h>
#include <sys/sysinfo.h>
#include <ctype.h>
#include <utmp.h>
#include <time.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "gdbsupport/xml-utils.h"
#include "gdbsupport/buffer.h"
#include <dirent.h>
#include <sys/stat.h>
#include "gdbsupport/filestuff.h"
#include <algorithm>
#define NAMELEN(dirent) strlen ((dirent)->d_name)
/* Define PID_T to be a fixed size that is at least as large as pid_t,
so that reading pid values embedded in /proc works
consistently. */
typedef long long PID_T;
/* Define TIME_T to be at least as large as time_t, so that reading
time values embedded in /proc works consistently. */
typedef long long TIME_T;
#define MAX_PID_T_STRLEN (sizeof ("-9223372036854775808") - 1)
/* Returns the CPU core that thread PTID is currently running on. */
/* Compute and return the processor core of a given thread. */
int
linux_common_core_of_thread (ptid_t ptid)
{
char filename[sizeof ("/proc//task//stat") + 2 * MAX_PID_T_STRLEN];
char *content = NULL;
char *p;
char *ts = 0;
int content_read = 0;
int i;
int core;
sprintf (filename, "/proc/%lld/task/%lld/stat",
(PID_T) ptid.pid (), (PID_T) ptid.lwp ());
gdb_file_up f = gdb_fopen_cloexec (filename, "r");
if (!f)
return -1;
for (;;)
{
int n;
content = (char *) xrealloc (content, content_read + 1024);
n = fread (content + content_read, 1, 1024, f.get ());
content_read += n;
if (n < 1024)
{
content[content_read] = '\0';
break;
}
}
/* ps command also relies on no trailing fields ever contain ')'. */
p = strrchr (content, ')');
if (p != NULL)
p++;
/* If the first field after program name has index 0, then core number is
the field with index 36. There's no constant for that anywhere. */
if (p != NULL)
p = strtok_r (p, " ", &ts);
for (i = 0; p != NULL && i != 36; ++i)
p = strtok_r (NULL, " ", &ts);
if (p == NULL || sscanf (p, "%d", &core) == 0)
core = -1;
xfree (content);
return core;
}
/* Finds the command-line of process PID and copies it into COMMAND.
At most MAXLEN characters are copied. If the command-line cannot
be found, PID is copied into command in text-form. */
static void
command_from_pid (char *command, int maxlen, PID_T pid)
{
std::string stat_path = string_printf ("/proc/%lld/stat", pid);
gdb_file_up fp = gdb_fopen_cloexec (stat_path, "r");
command[0] = '\0';
if (fp)
{
/* sizeof (cmd) should be greater or equal to TASK_COMM_LEN (in
include/linux/sched.h in the Linux kernel sources) plus two
(for the brackets). */
char cmd[18];
PID_T stat_pid;
int items_read = fscanf (fp.get (), "%lld %17s", &stat_pid, cmd);
if (items_read == 2 && pid == stat_pid)
{
cmd[strlen (cmd) - 1] = '\0'; /* Remove trailing parenthesis. */
strncpy (command, cmd + 1, maxlen); /* Ignore leading parenthesis. */
}
}
else
{
/* Return the PID if a /proc entry for the process cannot be found. */
snprintf (command, maxlen, "%lld", pid);
}
command[maxlen - 1] = '\0'; /* Ensure string is null-terminated. */
}
/* Returns the command-line of the process with the given PID. The
returned string needs to be freed using xfree after use. */
static char *
commandline_from_pid (PID_T pid)
{
std::string pathname = string_printf ("/proc/%lld/cmdline", pid);
char *commandline = NULL;
gdb_file_up f = gdb_fopen_cloexec (pathname, "r");
if (f)
{
size_t len = 0;
while (!feof (f.get ()))
{
char buf[1024];
size_t read_bytes = fread (buf, 1, sizeof (buf), f.get ());
if (read_bytes)
{
commandline = (char *) xrealloc (commandline, len + read_bytes + 1);
memcpy (commandline + len, buf, read_bytes);
len += read_bytes;
}
}
if (commandline)
{
size_t i;
/* Replace null characters with spaces. */
for (i = 0; i < len; ++i)
if (commandline[i] == '\0')
commandline[i] = ' ';
commandline[len] = '\0';
}
else
{
/* Return the command in square brackets if the command-line
is empty. */
commandline = (char *) xmalloc (32);
commandline[0] = '[';
command_from_pid (commandline + 1, 31, pid);
len = strlen (commandline);
if (len < 31)
strcat (commandline, "]");
}
}
return commandline;
}
/* Finds the user name for the user UID and copies it into USER. At
most MAXLEN characters are copied. */
static void
user_from_uid (char *user, int maxlen, uid_t uid)
{
struct passwd *pwentry;
char buf[1024];
struct passwd pwd;
getpwuid_r (uid, &pwd, buf, sizeof (buf), &pwentry);
if (pwentry)
{
strncpy (user, pwentry->pw_name, maxlen - 1);
/* Ensure that the user name is null-terminated. */
user[maxlen - 1] = '\0';
}
else
user[0] = '\0';
}
/* Finds the owner of process PID and returns the user id in OWNER.
Returns 0 if the owner was found, -1 otherwise. */
static int
get_process_owner (uid_t *owner, PID_T pid)
{
struct stat statbuf;
char procentry[sizeof ("/proc/") + MAX_PID_T_STRLEN];
sprintf (procentry, "/proc/%lld", pid);
if (stat (procentry, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
{
*owner = statbuf.st_uid;
return 0;
}
else
return -1;
}
/* Find the CPU cores used by process PID and return them in CORES.
CORES points to an array of NUM_CORES elements. */
static int
get_cores_used_by_process (PID_T pid, int *cores, const int num_cores)
{
char taskdir[sizeof ("/proc/") + MAX_PID_T_STRLEN + sizeof ("/task") - 1];
DIR *dir;
struct dirent *dp;
int task_count = 0;
sprintf (taskdir, "/proc/%lld/task", pid);
dir = opendir (taskdir);
if (dir)
{
while ((dp = readdir (dir)) != NULL)
{
PID_T tid;
int core;
if (!isdigit (dp->d_name[0])
|| NAMELEN (dp) > MAX_PID_T_STRLEN)
continue;
sscanf (dp->d_name, "%lld", &tid);
core = linux_common_core_of_thread (ptid_t ((pid_t) pid,
(pid_t) tid));
if (core >= 0 && core < num_cores)
{
++cores[core];
++task_count;
}
}
closedir (dir);
}
return task_count;
}
static void
linux_xfer_osdata_processes (struct buffer *buffer)
{
DIR *dirp;
buffer_grow_str (buffer, "<osdata type=\"processes\">\n");
dirp = opendir ("/proc");
if (dirp)
{
const int num_cores = sysconf (_SC_NPROCESSORS_ONLN);
struct dirent *dp;
while ((dp = readdir (dirp)) != NULL)
{
PID_T pid;
uid_t owner;
char user[UT_NAMESIZE];
char *command_line;
int *cores;
int task_count;
std::string cores_str;
int i;
if (!isdigit (dp->d_name[0])
|| NAMELEN (dp) > MAX_PID_T_STRLEN)
continue;
sscanf (dp->d_name, "%lld", &pid);
command_line = commandline_from_pid (pid);
if (get_process_owner (&owner, pid) == 0)
user_from_uid (user, sizeof (user), owner);
else
strcpy (user, "?");
/* Find CPU cores used by the process. */
cores = XCNEWVEC (int, num_cores);
task_count = get_cores_used_by_process (pid, cores, num_cores);
for (i = 0; i < num_cores && task_count > 0; ++i)
if (cores[i])
{
string_appendf (cores_str, "%d", i);
task_count -= cores[i];
if (task_count > 0)
cores_str += ",";
}
xfree (cores);
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"pid\">%lld</column>"
"<column name=\"user\">%s</column>"
"<column name=\"command\">%s</column>"
"<column name=\"cores\">%s</column>"
"</item>",
pid,
user,
command_line ? command_line : "",
cores_str.c_str());
xfree (command_line);
}
closedir (dirp);
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* A simple PID/PGID pair. */
struct pid_pgid_entry
{
pid_pgid_entry (PID_T pid_, PID_T pgid_)
: pid (pid_), pgid (pgid_)
{}
/* Return true if this pid is the leader of its process group. */
bool is_leader () const
{
return pid == pgid;
}
bool operator< (const pid_pgid_entry &other) const
{
/* Sort by PGID. */
if (this->pgid != other.pgid)
return this->pgid < other.pgid;
/* Process group leaders always come first... */
if (this->is_leader ())
{
if (!other.is_leader ())
return true;
}
else if (other.is_leader ())
return false;
/* ...else sort by PID. */
return this->pid < other.pid;
}
PID_T pid, pgid;
};
/* Collect all process groups from /proc in BUFFER. */
static void
linux_xfer_osdata_processgroups (struct buffer *buffer)
{
DIR *dirp;
buffer_grow_str (buffer, "<osdata type=\"process groups\">\n");
dirp = opendir ("/proc");
if (dirp)
{
std::vector<pid_pgid_entry> process_list;
struct dirent *dp;
process_list.reserve (512);
/* Build list consisting of PIDs followed by their
associated PGID. */
while ((dp = readdir (dirp)) != NULL)
{
PID_T pid, pgid;
if (!isdigit (dp->d_name[0])
|| NAMELEN (dp) > MAX_PID_T_STRLEN)
continue;
sscanf (dp->d_name, "%lld", &pid);
pgid = getpgid (pid);
if (pgid > 0)
process_list.emplace_back (pid, pgid);
}
closedir (dirp);
/* Sort the process list. */
std::sort (process_list.begin (), process_list.end ());
for (const pid_pgid_entry &entry : process_list)
{
PID_T pid = entry.pid;
PID_T pgid = entry.pgid;
char leader_command[32];
char *command_line;
command_from_pid (leader_command, sizeof (leader_command), pgid);
command_line = commandline_from_pid (pid);
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"pgid\">%lld</column>"
"<column name=\"leader command\">%s</column>"
"<column name=\"pid\">%lld</column>"
"<column name=\"command line\">%s</column>"
"</item>",
pgid,
leader_command,
pid,
command_line ? command_line : "");
xfree (command_line);
}
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect all the threads in /proc by iterating through processes and
then tasks within each process in BUFFER. */
static void
linux_xfer_osdata_threads (struct buffer *buffer)
{
DIR *dirp;
buffer_grow_str (buffer, "<osdata type=\"threads\">\n");
dirp = opendir ("/proc");
if (dirp)
{
struct dirent *dp;
while ((dp = readdir (dirp)) != NULL)
{
struct stat statbuf;
char procentry[sizeof ("/proc/4294967295")];
if (!isdigit (dp->d_name[0])
|| NAMELEN (dp) > sizeof ("4294967295") - 1)
continue;
xsnprintf (procentry, sizeof (procentry), "/proc/%s",
dp->d_name);
if (stat (procentry, &statbuf) == 0
&& S_ISDIR (statbuf.st_mode))
{
DIR *dirp2;
PID_T pid;
char command[32];
std::string pathname
= string_printf ("/proc/%s/task", dp->d_name);
pid = atoi (dp->d_name);
command_from_pid (command, sizeof (command), pid);
dirp2 = opendir (pathname.c_str ());
if (dirp2)
{
struct dirent *dp2;
while ((dp2 = readdir (dirp2)) != NULL)
{
PID_T tid;
int core;
if (!isdigit (dp2->d_name[0])
|| NAMELEN (dp2) > sizeof ("4294967295") - 1)
continue;
tid = atoi (dp2->d_name);
core = linux_common_core_of_thread (ptid_t (pid, tid));
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"pid\">%lld</column>"
"<column name=\"command\">%s</column>"
"<column name=\"tid\">%lld</column>"
"<column name=\"core\">%d</column>"
"</item>",
pid,
command,
tid,
core);
}
closedir (dirp2);
}
}
}
closedir (dirp);
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect data about the cpus/cores on the system in BUFFER. */
static void
linux_xfer_osdata_cpus (struct buffer *buffer)
{
int first_item = 1;
buffer_grow_str (buffer, "<osdata type=\"cpus\">\n");
gdb_file_up fp = gdb_fopen_cloexec ("/proc/cpuinfo", "r");
if (fp != NULL)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
char *key, *value;
int i = 0;
char *saveptr;
key = strtok_r (buf, ":", &saveptr);
if (key == NULL)
continue;
value = strtok_r (NULL, ":", &saveptr);
if (value == NULL)
continue;
while (key[i] != '\t' && key[i] != '\0')
i++;
key[i] = '\0';
i = 0;
while (value[i] != '\t' && value[i] != '\0')
i++;
value[i] = '\0';
if (strcmp (key, "processor") == 0)
{
if (first_item)
buffer_grow_str (buffer, "<item>");
else
buffer_grow_str (buffer, "</item><item>");
first_item = 0;
}
buffer_xml_printf (buffer,
"<column name=\"%s\">%s</column>",
key,
value);
}
}
while (!feof (fp.get ()));
if (first_item == 0)
buffer_grow_str (buffer, "</item>");
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect all the open file descriptors found in /proc and put the details
found about them into BUFFER. */
static void
linux_xfer_osdata_fds (struct buffer *buffer)
{
DIR *dirp;
buffer_grow_str (buffer, "<osdata type=\"files\">\n");
dirp = opendir ("/proc");
if (dirp)
{
struct dirent *dp;
while ((dp = readdir (dirp)) != NULL)
{
struct stat statbuf;
char procentry[sizeof ("/proc/4294967295")];
if (!isdigit (dp->d_name[0])
|| NAMELEN (dp) > sizeof ("4294967295") - 1)
continue;
xsnprintf (procentry, sizeof (procentry), "/proc/%s",
dp->d_name);
if (stat (procentry, &statbuf) == 0
&& S_ISDIR (statbuf.st_mode))
{
DIR *dirp2;
PID_T pid;
char command[32];
pid = atoi (dp->d_name);
command_from_pid (command, sizeof (command), pid);
std::string pathname
= string_printf ("/proc/%s/fd", dp->d_name);
dirp2 = opendir (pathname.c_str ());
if (dirp2)
{
struct dirent *dp2;
while ((dp2 = readdir (dirp2)) != NULL)
{
char buf[1000];
ssize_t rslt;
if (!isdigit (dp2->d_name[0]))
continue;
std::string fdname
= string_printf ("%s/%s", pathname.c_str (),
dp2->d_name);
rslt = readlink (fdname.c_str (), buf,
sizeof (buf) - 1);
if (rslt >= 0)
buf[rslt] = '\0';
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"pid\">%s</column>"
"<column name=\"command\">%s</column>"
"<column name=\"file descriptor\">%s</column>"
"<column name=\"name\">%s</column>"
"</item>",
dp->d_name,
command,
dp2->d_name,
(rslt >= 0 ? buf : dp2->d_name));
}
closedir (dirp2);
}
}
}
closedir (dirp);
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Returns the socket state STATE in textual form. */
static const char *
format_socket_state (unsigned char state)
{
/* Copied from include/net/tcp_states.h in the Linux kernel sources. */
enum {
TCP_ESTABLISHED = 1,
TCP_SYN_SENT,
TCP_SYN_RECV,
TCP_FIN_WAIT1,
TCP_FIN_WAIT2,
TCP_TIME_WAIT,
TCP_CLOSE,
TCP_CLOSE_WAIT,
TCP_LAST_ACK,
TCP_LISTEN,
TCP_CLOSING
};
switch (state)
{
case TCP_ESTABLISHED:
return "ESTABLISHED";
case TCP_SYN_SENT:
return "SYN_SENT";
case TCP_SYN_RECV:
return "SYN_RECV";
case TCP_FIN_WAIT1:
return "FIN_WAIT1";
case TCP_FIN_WAIT2:
return "FIN_WAIT2";
case TCP_TIME_WAIT:
return "TIME_WAIT";
case TCP_CLOSE:
return "CLOSE";
case TCP_CLOSE_WAIT:
return "CLOSE_WAIT";
case TCP_LAST_ACK:
return "LAST_ACK";
case TCP_LISTEN:
return "LISTEN";
case TCP_CLOSING:
return "CLOSING";
default:
return "(unknown)";
}
}
union socket_addr
{
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
/* Auxiliary function used by linux_xfer_osdata_isocket. Formats
information for all open internet sockets of type FAMILY on the
system into BUFFER. If TCP is set, only TCP sockets are processed,
otherwise only UDP sockets are processed. */
static void
print_sockets (unsigned short family, int tcp, struct buffer *buffer)
{
const char *proc_file;
if (family == AF_INET)
proc_file = tcp ? "/proc/net/tcp" : "/proc/net/udp";
else if (family == AF_INET6)
proc_file = tcp ? "/proc/net/tcp6" : "/proc/net/udp6";
else
return;
gdb_file_up fp = gdb_fopen_cloexec (proc_file, "r");
if (fp)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
uid_t uid;
unsigned int local_port, remote_port, state;
char local_address[NI_MAXHOST], remote_address[NI_MAXHOST];
int result;
#if NI_MAXHOST <= 32
#error "local_address and remote_address buffers too small"
#endif
result = sscanf (buf,
"%*d: %32[0-9A-F]:%X %32[0-9A-F]:%X %X %*X:%*X %*X:%*X %*X %d %*d %*u %*s\n",
local_address, &local_port,
remote_address, &remote_port,
&state,
&uid);
if (result == 6)
{
union socket_addr locaddr, remaddr;
size_t addr_size;
char user[UT_NAMESIZE];
char local_service[NI_MAXSERV], remote_service[NI_MAXSERV];
if (family == AF_INET)
{
sscanf (local_address, "%X",
&locaddr.sin.sin_addr.s_addr);
sscanf (remote_address, "%X",
&remaddr.sin.sin_addr.s_addr);
locaddr.sin.sin_port = htons (local_port);
remaddr.sin.sin_port = htons (remote_port);
addr_size = sizeof (struct sockaddr_in);
}
else
{
sscanf (local_address, "%8X%8X%8X%8X",
locaddr.sin6.sin6_addr.s6_addr32,
locaddr.sin6.sin6_addr.s6_addr32 + 1,
locaddr.sin6.sin6_addr.s6_addr32 + 2,
locaddr.sin6.sin6_addr.s6_addr32 + 3);
sscanf (remote_address, "%8X%8X%8X%8X",
remaddr.sin6.sin6_addr.s6_addr32,
remaddr.sin6.sin6_addr.s6_addr32 + 1,
remaddr.sin6.sin6_addr.s6_addr32 + 2,
remaddr.sin6.sin6_addr.s6_addr32 + 3);
locaddr.sin6.sin6_port = htons (local_port);
remaddr.sin6.sin6_port = htons (remote_port);
locaddr.sin6.sin6_flowinfo = 0;
remaddr.sin6.sin6_flowinfo = 0;
locaddr.sin6.sin6_scope_id = 0;
remaddr.sin6.sin6_scope_id = 0;
addr_size = sizeof (struct sockaddr_in6);
}
locaddr.sa.sa_family = remaddr.sa.sa_family = family;
result = getnameinfo (&locaddr.sa, addr_size,
local_address, sizeof (local_address),
local_service, sizeof (local_service),
NI_NUMERICHOST | NI_NUMERICSERV
| (tcp ? 0 : NI_DGRAM));
if (result)
continue;
result = getnameinfo (&remaddr.sa, addr_size,
remote_address,
sizeof (remote_address),
remote_service,
sizeof (remote_service),
NI_NUMERICHOST | NI_NUMERICSERV
| (tcp ? 0 : NI_DGRAM));
if (result)
continue;
user_from_uid (user, sizeof (user), uid);
buffer_xml_printf (
buffer,
"<item>"
"<column name=\"local address\">%s</column>"
"<column name=\"local port\">%s</column>"
"<column name=\"remote address\">%s</column>"
"<column name=\"remote port\">%s</column>"
"<column name=\"state\">%s</column>"
"<column name=\"user\">%s</column>"
"<column name=\"family\">%s</column>"
"<column name=\"protocol\">%s</column>"
"</item>",
local_address,
local_service,
remote_address,
remote_service,
format_socket_state (state),
user,
(family == AF_INET) ? "INET" : "INET6",
tcp ? "STREAM" : "DGRAM");
}
}
}
while (!feof (fp.get ()));
}
}
/* Collect data about internet sockets and write it into BUFFER. */
static void
linux_xfer_osdata_isockets (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"I sockets\">\n");
print_sockets (AF_INET, 1, buffer);
print_sockets (AF_INET, 0, buffer);
print_sockets (AF_INET6, 1, buffer);
print_sockets (AF_INET6, 0, buffer);
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Converts the time SECONDS into textual form and copies it into a
buffer TIME, with at most MAXLEN characters copied. */
static void
time_from_time_t (char *time, int maxlen, TIME_T seconds)
{
if (!seconds)
time[0] = '\0';
else
{
time_t t = (time_t) seconds;
/* Per the ctime_r manpage, this buffer needs to be at least 26
characters long. */
char buf[30];
const char *time_str = ctime_r (&t, buf);
strncpy (time, time_str, maxlen - 1);
time[maxlen - 1] = '\0';
}
}
/* Finds the group name for the group GID and copies it into GROUP.
At most MAXLEN characters are copied. */
static void
group_from_gid (char *group, int maxlen, gid_t gid)
{
struct group *grentry = getgrgid (gid);
if (grentry)
{
strncpy (group, grentry->gr_name, maxlen - 1);
/* Ensure that the group name is null-terminated. */
group[maxlen - 1] = '\0';
}
else
group[0] = '\0';
}
/* Collect data about shared memory recorded in /proc and write it
into BUFFER. */
static void
linux_xfer_osdata_shm (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"shared memory\">\n");
gdb_file_up fp = gdb_fopen_cloexec ("/proc/sysvipc/shm", "r");
if (fp)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
key_t key;
uid_t uid, cuid;
gid_t gid, cgid;
PID_T cpid, lpid;
int shmid, size, nattch;
TIME_T atime, dtime, ctime;
unsigned int perms;
int items_read;
items_read = sscanf (buf,
"%d %d %o %d %lld %lld %d %u %u %u %u %lld %lld %lld",
&key, &shmid, &perms, &size,
&cpid, &lpid,
&nattch,
&uid, &gid, &cuid, &cgid,
&atime, &dtime, &ctime);
if (items_read == 14)
{
char user[UT_NAMESIZE], group[UT_NAMESIZE];
char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
char ccmd[32], lcmd[32];
char atime_str[32], dtime_str[32], ctime_str[32];
user_from_uid (user, sizeof (user), uid);
group_from_gid (group, sizeof (group), gid);
user_from_uid (cuser, sizeof (cuser), cuid);
group_from_gid (cgroup, sizeof (cgroup), cgid);
command_from_pid (ccmd, sizeof (ccmd), cpid);
command_from_pid (lcmd, sizeof (lcmd), lpid);
time_from_time_t (atime_str, sizeof (atime_str), atime);
time_from_time_t (dtime_str, sizeof (dtime_str), dtime);
time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"key\">%d</column>"
"<column name=\"shmid\">%d</column>"
"<column name=\"permissions\">%o</column>"
"<column name=\"size\">%d</column>"
"<column name=\"creator command\">%s</column>"
"<column name=\"last op. command\">%s</column>"
"<column name=\"num attached\">%d</column>"
"<column name=\"user\">%s</column>"
"<column name=\"group\">%s</column>"
"<column name=\"creator user\">%s</column>"
"<column name=\"creator group\">%s</column>"
"<column name=\"last shmat() time\">%s</column>"
"<column name=\"last shmdt() time\">%s</column>"
"<column name=\"last shmctl() time\">%s</column>"
"</item>",
key,
shmid,
perms,
size,
ccmd,
lcmd,
nattch,
user,
group,
cuser,
cgroup,
atime_str,
dtime_str,
ctime_str);
}
}
}
while (!feof (fp.get ()));
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect data about semaphores recorded in /proc and write it
into BUFFER. */
static void
linux_xfer_osdata_sem (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"semaphores\">\n");
gdb_file_up fp = gdb_fopen_cloexec ("/proc/sysvipc/sem", "r");
if (fp)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
key_t key;
uid_t uid, cuid;
gid_t gid, cgid;
unsigned int perms, nsems;
int semid;
TIME_T otime, ctime;
int items_read;
items_read = sscanf (buf,
"%d %d %o %u %d %d %d %d %lld %lld",
&key, &semid, &perms, &nsems,
&uid, &gid, &cuid, &cgid,
&otime, &ctime);
if (items_read == 10)
{
char user[UT_NAMESIZE], group[UT_NAMESIZE];
char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
char otime_str[32], ctime_str[32];
user_from_uid (user, sizeof (user), uid);
group_from_gid (group, sizeof (group), gid);
user_from_uid (cuser, sizeof (cuser), cuid);
group_from_gid (cgroup, sizeof (cgroup), cgid);
time_from_time_t (otime_str, sizeof (otime_str), otime);
time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"key\">%d</column>"
"<column name=\"semid\">%d</column>"
"<column name=\"permissions\">%o</column>"
"<column name=\"num semaphores\">%u</column>"
"<column name=\"user\">%s</column>"
"<column name=\"group\">%s</column>"
"<column name=\"creator user\">%s</column>"
"<column name=\"creator group\">%s</column>"
"<column name=\"last semop() time\">%s</column>"
"<column name=\"last semctl() time\">%s</column>"
"</item>",
key,
semid,
perms,
nsems,
user,
group,
cuser,
cgroup,
otime_str,
ctime_str);
}
}
}
while (!feof (fp.get ()));
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect data about message queues recorded in /proc and write it
into BUFFER. */
static void
linux_xfer_osdata_msg (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"message queues\">\n");
gdb_file_up fp = gdb_fopen_cloexec ("/proc/sysvipc/msg", "r");
if (fp)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
key_t key;
PID_T lspid, lrpid;
uid_t uid, cuid;
gid_t gid, cgid;
unsigned int perms, cbytes, qnum;
int msqid;
TIME_T stime, rtime, ctime;
int items_read;
items_read = sscanf (buf,
"%d %d %o %u %u %lld %lld %d %d %d %d %lld %lld %lld",
&key, &msqid, &perms, &cbytes, &qnum,
&lspid, &lrpid, &uid, &gid, &cuid, &cgid,
&stime, &rtime, &ctime);
if (items_read == 14)
{
char user[UT_NAMESIZE], group[UT_NAMESIZE];
char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE];
char lscmd[32], lrcmd[32];
char stime_str[32], rtime_str[32], ctime_str[32];
user_from_uid (user, sizeof (user), uid);
group_from_gid (group, sizeof (group), gid);
user_from_uid (cuser, sizeof (cuser), cuid);
group_from_gid (cgroup, sizeof (cgroup), cgid);
command_from_pid (lscmd, sizeof (lscmd), lspid);
command_from_pid (lrcmd, sizeof (lrcmd), lrpid);
time_from_time_t (stime_str, sizeof (stime_str), stime);
time_from_time_t (rtime_str, sizeof (rtime_str), rtime);
time_from_time_t (ctime_str, sizeof (ctime_str), ctime);
buffer_xml_printf
(buffer,
"<item>"
"<column name=\"key\">%d</column>"
"<column name=\"msqid\">%d</column>"
"<column name=\"permissions\">%o</column>"
"<column name=\"num used bytes\">%u</column>"
"<column name=\"num messages\">%u</column>"
"<column name=\"last msgsnd() command\">%s</column>"
"<column name=\"last msgrcv() command\">%s</column>"
"<column name=\"user\">%s</column>"
"<column name=\"group\">%s</column>"
"<column name=\"creator user\">%s</column>"
"<column name=\"creator group\">%s</column>"
"<column name=\"last msgsnd() time\">%s</column>"
"<column name=\"last msgrcv() time\">%s</column>"
"<column name=\"last msgctl() time\">%s</column>"
"</item>",
key,
msqid,
perms,
cbytes,
qnum,
lscmd,
lrcmd,
user,
group,
cuser,
cgroup,
stime_str,
rtime_str,
ctime_str);
}
}
}
while (!feof (fp.get ()));
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Collect data about loaded kernel modules and write it into
BUFFER. */
static void
linux_xfer_osdata_modules (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"modules\">\n");
gdb_file_up fp = gdb_fopen_cloexec ("/proc/modules", "r");
if (fp)
{
char buf[8192];
do
{
if (fgets (buf, sizeof (buf), fp.get ()))
{
char *name, *dependencies, *status, *tmp, *saveptr;
unsigned int size;
unsigned long long address;
int uses;
name = strtok_r (buf, " ", &saveptr);
if (name == NULL)
continue;
tmp = strtok_r (NULL, " ", &saveptr);
if (tmp == NULL)
continue;
if (sscanf (tmp, "%u", &size) != 1)
continue;
tmp = strtok_r (NULL, " ", &saveptr);
if (tmp == NULL)
continue;
if (sscanf (tmp, "%d", &uses) != 1)
continue;
dependencies = strtok_r (NULL, " ", &saveptr);
if (dependencies == NULL)
continue;
status = strtok_r (NULL, " ", &saveptr);
if (status == NULL)
continue;
tmp = strtok_r (NULL, "\n", &saveptr);
if (tmp == NULL)
continue;
if (sscanf (tmp, "%llx", &address) != 1)
continue;
buffer_xml_printf (buffer,
"<item>"
"<column name=\"name\">%s</column>"
"<column name=\"size\">%u</column>"
"<column name=\"num uses\">%d</column>"
"<column name=\"dependencies\">%s</column>"
"<column name=\"status\">%s</column>"
"<column name=\"address\">%llx</column>"
"</item>",
name,
size,
uses,
dependencies,
status,
address);
}
}
while (!feof (fp.get ()));
}
buffer_grow_str0 (buffer, "</osdata>\n");
}
static void linux_xfer_osdata_info_os_types (struct buffer *buffer);
static struct osdata_type {
const char *type;
const char *title;
const char *description;
void (*take_snapshot) (struct buffer *buffer);
LONGEST len_avail;
struct buffer buffer;
} osdata_table[] = {
{ "types", "Types", "Listing of info os types you can list",
linux_xfer_osdata_info_os_types, -1 },
{ "cpus", "CPUs", "Listing of all cpus/cores on the system",
linux_xfer_osdata_cpus, -1 },
{ "files", "File descriptors", "Listing of all file descriptors",
linux_xfer_osdata_fds, -1 },
{ "modules", "Kernel modules", "Listing of all loaded kernel modules",
linux_xfer_osdata_modules, -1 },
{ "msg", "Message queues", "Listing of all message queues",
linux_xfer_osdata_msg, -1 },
{ "processes", "Processes", "Listing of all processes",
linux_xfer_osdata_processes, -1 },
{ "procgroups", "Process groups", "Listing of all process groups",
linux_xfer_osdata_processgroups, -1 },
{ "semaphores", "Semaphores", "Listing of all semaphores",
linux_xfer_osdata_sem, -1 },
{ "shm", "Shared-memory regions", "Listing of all shared-memory regions",
linux_xfer_osdata_shm, -1 },
{ "sockets", "Sockets", "Listing of all internet-domain sockets",
linux_xfer_osdata_isockets, -1 },
{ "threads", "Threads", "Listing of all threads",
linux_xfer_osdata_threads, -1 },
{ NULL, NULL, NULL }
};
/* Collect data about all types info os can show in BUFFER. */
static void
linux_xfer_osdata_info_os_types (struct buffer *buffer)
{
buffer_grow_str (buffer, "<osdata type=\"types\">\n");
/* Start the below loop at 1, as we do not want to list ourselves. */
for (int i = 1; osdata_table[i].type; ++i)
buffer_xml_printf (buffer,
"<item>"
"<column name=\"Type\">%s</column>"
"<column name=\"Description\">%s</column>"
"<column name=\"Title\">%s</column>"
"</item>",
osdata_table[i].type,
osdata_table[i].description,
osdata_table[i].title);
buffer_grow_str0 (buffer, "</osdata>\n");
}
/* Copies up to LEN bytes in READBUF from offset OFFSET in OSD->BUFFER.
If OFFSET is zero, first calls OSD->TAKE_SNAPSHOT. */
static LONGEST
common_getter (struct osdata_type *osd,
gdb_byte *readbuf, ULONGEST offset, ULONGEST len)
{
gdb_assert (readbuf);
if (offset == 0)
{
if (osd->len_avail != -1 && osd->len_avail != 0)
buffer_free (&osd->buffer);
osd->len_avail = 0;
buffer_init (&osd->buffer);
(osd->take_snapshot) (&osd->buffer);
osd->len_avail = strlen (osd->buffer.buffer);
}
if (offset >= osd->len_avail)
{
/* Done. Get rid of the buffer. */
buffer_free (&osd->buffer);
osd->len_avail = 0;
return 0;
}
if (len > osd->len_avail - offset)
len = osd->len_avail - offset;
memcpy (readbuf, osd->buffer.buffer + offset, len);
return len;
}
LONGEST
linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf,
ULONGEST offset, ULONGEST len)
{
if (!annex || *annex == '\0')
{
return common_getter (&osdata_table[0],
readbuf, offset, len);
}
else
{
int i;
for (i = 0; osdata_table[i].type; ++i)
{
if (strcmp (annex, osdata_table[i].type) == 0)
return common_getter (&osdata_table[i],
readbuf, offset, len);
}
return 0;
}
}
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