/* GNU/Linux native-dependent code common to multiple platforms.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
#include "inf-loop.h"
#include "event-loop.h"
#include "event-top.h"
+#include <pwd.h>
+#include <sys/types.h>
+#include "gdb_dirent.h"
+#include "xml-support.h"
#ifdef HAVE_PERSONALITY
# include <sys/personality.h>
static int linux_nat_async_mask (int mask);
static int kill_lwp (int lwpid, int signo);
-static int send_sigint_callback (struct lwp_info *lp, void *data);
static int stop_callback (struct lwp_info *lp, void *data);
/* Captures the result of a successful waitpid call, along with the
in the async SIGCHLD handler. */
static struct waitpid_result *waitpid_queue = NULL;
+/* Similarly to `waitpid', but check the local event queue instead of
+ querying the kernel queue. If PEEK, don't remove the event found
+ from the queue. */
+
static int
-queued_waitpid (int pid, int *status, int flags)
+queued_waitpid_1 (int pid, int *status, int flags, int peek)
{
struct waitpid_result *msg = waitpid_queue, *prev = NULL;
{
int pid;
- if (prev)
- prev->next = msg->next;
- else
- waitpid_queue = msg->next;
-
- msg->next = NULL;
if (status)
*status = msg->status;
pid = msg->pid;
if (debug_linux_nat_async)
fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n",
pid, msg->status);
- xfree (msg);
+
+ if (!peek)
+ {
+ if (prev)
+ prev->next = msg->next;
+ else
+ waitpid_queue = msg->next;
+
+ msg->next = NULL;
+ xfree (msg);
+ }
return pid;
}
return -1;
}
+/* Similarly to `waitpid', but check the local event queue. */
+
+static int
+queued_waitpid (int pid, int *status, int flags)
+{
+ return queued_waitpid_1 (pid, status, flags, 0);
+}
+
static void
push_waitpid (int pid, int status, int options)
{
else
{
struct fork_info *fp;
+ struct inferior *parent_inf, *child_inf;
/* Add process to GDB's tables. */
- add_inferior (child_pid);
+ child_inf = add_inferior (child_pid);
+
+ parent_inf = find_inferior_pid (GET_PID (last_ptid));
+ child_inf->attach_flag = parent_inf->attach_flag;
/* Retain child fork in ptrace (stopped) state. */
fp = find_fork_pid (child_pid);
struct thread_info *last_tp = find_thread_pid (last_ptid);
struct thread_info *tp;
char child_pid_spelling[40];
+ struct inferior *parent_inf, *child_inf;
/* Copy user stepping state to the new inferior thread. */
struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint;
child_pid);
}
+ /* Add the new inferior first, so that the target_detach below
+ doesn't unpush the target. */
+
+ child_inf = add_inferior (child_pid);
+
+ parent_inf = find_inferior_pid (GET_PID (last_ptid));
+ child_inf->attach_flag = parent_inf->attach_flag;
+
/* If we're vforking, we may want to hold on to the parent until
the child exits or execs. At exec time we can remove the old
breakpoints from the parent and detach it; at exit time we
if (!fp)
fp = add_fork (parent_pid);
fork_save_infrun_state (fp, 0);
+
+ /* Also add an entry for the child fork. */
+ fp = find_fork_pid (child_pid);
+ if (!fp)
+ fp = add_fork (child_pid);
+ fork_save_infrun_state (fp, 0);
}
else
target_detach (NULL, 0);
inferior_ptid = ptid_build (child_pid, child_pid, 0);
- add_inferior (child_pid);
-
- /* Reinstall ourselves, since we might have been removed in
- target_detach (which does other necessary cleanup). */
- push_target (ops);
linux_nat_switch_fork (inferior_ptid);
check_for_thread_db ();
}
static void
-linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
+linux_nat_create_inferior (struct target_ops *ops,
+ char *exec_file, char *allargs, char **env,
int from_tty)
{
int saved_async = 0;
}
#endif /* HAVE_PERSONALITY */
- linux_ops->to_create_inferior (exec_file, allargs, env, from_tty);
+ linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty);
#ifdef HAVE_PERSONALITY
if (personality_set)
}
static void
-linux_nat_attach (char *args, int from_tty)
+linux_nat_attach (struct target_ops *ops, char *args, int from_tty)
{
struct lwp_info *lp;
int status;
/* FIXME: We should probably accept a list of process id's, and
attach all of them. */
- linux_ops->to_attach (args, from_tty);
+ linux_ops->to_attach (ops, args, from_tty);
if (!target_can_async_p ())
{
queue. */
if (queued_waitpid (GET_LWP (lp->ptid), status, __WALL) != -1)
{
- if (WIFSTOPPED (status))
- signo = target_signal_from_host (WSTOPSIG (status));
+ if (WIFSTOPPED (*status))
+ signo = target_signal_from_host (WSTOPSIG (*status));
/* If not stopped, then the lwp is gone, no use in
resending a signal. */
}
static void
-linux_nat_detach (char *args, int from_tty)
+linux_nat_detach (struct target_ops *ops, char *args, int from_tty)
{
int pid;
int status;
/* Destroy LWP info; it's no longer valid. */
init_lwp_list ();
- pid = GET_PID (inferior_ptid);
- inferior_ptid = pid_to_ptid (pid);
- linux_ops->to_detach (args, from_tty);
+ pid = ptid_get_pid (inferior_ptid);
if (target_can_async_p ())
drain_queued_events (pid);
+
+ if (forks_exist_p ())
+ {
+ /* Multi-fork case. The current inferior_ptid is being detached
+ from, but there are other viable forks to debug. Detach from
+ the current fork, and context-switch to the first
+ available. */
+ linux_fork_detach (args, from_tty);
+
+ if (non_stop && target_can_async_p ())
+ target_async (inferior_event_handler, 0);
+ }
+ else
+ linux_ops->to_detach (ops, args, from_tty);
}
/* Resume LP. */
if (lp->status && WIFSTOPPED (lp->status))
{
- int saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
+ int saved_signo;
+ struct inferior *inf;
- if (signal_stop_state (saved_signo) == 0
+ inf = find_inferior_pid (ptid_get_pid (ptid));
+ gdb_assert (inf);
+ saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
+
+ /* Defer to common code if we're gaining control of the
+ inferior. */
+ if (inf->stop_soon == NO_STOP_QUIETLY
+ && signal_stop_state (saved_signo) == 0
&& signal_print_state (saved_signo) == 0
&& signal_pass_state (saved_signo) == 1)
{
/* There was no gdb breakpoint set at pc. Put
the event back in the queue. */
if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "SWC: kill %s, %s\n",
- target_pid_to_str (lp->ptid),
- status_to_str ((int) status));
- kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
+ fprintf_unfiltered (gdb_stdlog, "\
+SWC: leaving SIGTRAP in local queue of %s\n", target_pid_to_str (lp->ptid));
+ push_waitpid (GET_LWP (lp->ptid),
+ W_STOPCODE (SIGTRAP),
+ lp->cloned ? __WCLONE : 0);
}
}
else
}
static ptid_t
-linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+linux_nat_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *ourstatus)
{
struct lwp_info *lp = NULL;
int options = 0;
{
/* Causes SIGINT to be passed on to the attached process. */
set_sigint_trap ();
- set_sigio_trap ();
}
while (status == 0)
}
if (!target_can_async_p ())
- {
- clear_sigio_trap ();
- clear_sigint_trap ();
- }
+ clear_sigint_trap ();
gdb_assert (lp);
if (WIFSTOPPED (status))
{
int signo = target_signal_from_host (WSTOPSIG (status));
+ struct inferior *inf;
+
+ inf = find_inferior_pid (ptid_get_pid (lp->ptid));
+ gdb_assert (inf);
- /* If we get a signal while single-stepping, we may need special
- care, e.g. to skip the signal handler. Defer to common code. */
+ /* Defer to common code if we get a signal while
+ single-stepping, since that may need special care, e.g. to
+ skip the signal handler, or, if we're gaining control of the
+ inferior. */
if (!lp->step
+ && inf->stop_soon == NO_STOP_QUIETLY
&& signal_stop_state (signo) == 0
&& signal_print_state (signo) == 0
&& signal_pass_state (signo) == 1)
}
static void
-linux_nat_mourn_inferior (void)
+linux_nat_mourn_inferior (struct target_ops *ops)
{
/* Destroy LWP info; it's no longer valid. */
init_lwp_list ();
/* Normal case, no other forks available. */
if (target_can_async_p ())
linux_nat_async (NULL, 0);
- linux_ops->to_mourn_inferior ();
+ linux_ops->to_mourn_inferior (ops);
}
else
/* Multi-fork case. The current inferior_ptid has exited, but
linux_fork_mourn_inferior ();
}
+static LONGEST
+linux_xfer_siginfo (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ struct lwp_info *lp;
+ LONGEST n;
+ int pid;
+ struct siginfo siginfo;
+
+ gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO);
+ gdb_assert (readbuf || writebuf);
+
+ pid = GET_LWP (inferior_ptid);
+ if (pid == 0)
+ pid = GET_PID (inferior_ptid);
+
+ if (offset > sizeof (siginfo))
+ return -1;
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ return -1;
+
+ if (offset + len > sizeof (siginfo))
+ len = sizeof (siginfo) - offset;
+
+ if (readbuf != NULL)
+ memcpy (readbuf, (char *)&siginfo + offset, len);
+ else
+ {
+ memcpy ((char *)&siginfo + offset, writebuf, len);
+ errno = 0;
+ ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ return -1;
+ }
+
+ return len;
+}
+
static LONGEST
linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
- struct cleanup *old_chain = save_inferior_ptid ();
+ struct cleanup *old_chain;
LONGEST xfer;
+ if (object == TARGET_OBJECT_SIGNAL_INFO)
+ return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
+ old_chain = save_inferior_ptid ();
+
if (is_lwp (inferior_ptid))
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
}
static char *
-linux_nat_pid_to_str (ptid_t ptid)
+linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
static char buf[64];
char permissions[8], device[8], filename[MAXPATHLEN];
int read, write, exec;
int ret;
+ struct cleanup *cleanup;
/* Compose the filename for the /proc memory map, and open it. */
sprintf (mapsfilename, "/proc/%lld/maps", pid);
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
error (_("Could not open %s."), mapsfilename);
+ cleanup = make_cleanup_fclose (mapsfile);
if (info_verbose)
fprintf_filtered (gdb_stdout,
segment. */
func (addr, size, read, write, exec, obfd);
}
- fclose (mapsfile);
+ do_cleanups (cleanup);
return 0;
}
if (args)
{
/* Break up 'args' into an argv array. */
- if ((argv = buildargv (args)) == NULL)
- nomem (0);
- else
- make_cleanup_freeargv (argv);
+ argv = gdb_buildargv (args);
+ make_cleanup_freeargv (argv);
}
while (argv != NULL && *argv != NULL)
{
sprintf (fname1, "/proc/%lld/cmdline", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
- fgets (buffer, sizeof (buffer), procfile);
- printf_filtered ("cmdline = '%s'\n", buffer);
- fclose (procfile);
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
+ if (fgets (buffer, sizeof (buffer), procfile))
+ printf_filtered ("cmdline = '%s'\n", buffer);
+ else
+ warning (_("unable to read '%s'"), fname1);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
{
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
+ struct cleanup *cleanup;
+ cleanup = make_cleanup_fclose (procfile);
printf_filtered (_("Mapped address spaces:\n\n"));
if (gdbarch_addr_bit (current_gdbarch) == 32)
{
}
}
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
sprintf (fname1, "/proc/%lld/status", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
puts_filtered (buffer);
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
int itmp;
char ctmp;
long ltmp;
+ struct cleanup *cleanup = make_cleanup_fclose (procfile);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered (_("Process: %d\n"), itmp);
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
#endif
- fclose (procfile);
+ do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), fname1);
FILE *procfile;
char buffer[MAXPATHLEN], fname[MAXPATHLEN];
int signum;
+ struct cleanup *cleanup;
sigemptyset (pending);
sigemptyset (blocked);
procfile = fopen (fname, "r");
if (procfile == NULL)
error (_("Could not open %s"), fname);
+ cleanup = make_cleanup_fclose (procfile);
while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
{
add_line_to_sigset (buffer + 8, ignored);
}
- fclose (procfile);
+ do_cleanups (cleanup);
+}
+
+static LONGEST
+linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ /* We make the process list snapshot when the object starts to be
+ read. */
+ static const char *buf;
+ static LONGEST len_avail = -1;
+ static struct obstack obstack;
+
+ DIR *dirp;
+
+ gdb_assert (object == TARGET_OBJECT_OSDATA);
+
+ if (strcmp (annex, "processes") != 0)
+ return 0;
+
+ gdb_assert (readbuf && !writebuf);
+
+ if (offset == 0)
+ {
+ if (len_avail != -1 && len_avail != 0)
+ obstack_free (&obstack, NULL);
+ len_avail = 0;
+ buf = NULL;
+ obstack_init (&obstack);
+ obstack_grow_str (&obstack, "<osdata type=\"processes\">\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])
+ || strlen (dp->d_name) > sizeof ("4294967295") - 1)
+ continue;
+
+ sprintf (procentry, "/proc/%s", dp->d_name);
+ if (stat (procentry, &statbuf) == 0
+ && S_ISDIR (statbuf.st_mode))
+ {
+ char *pathname;
+ FILE *f;
+ char cmd[MAXPATHLEN + 1];
+ struct passwd *entry;
+
+ pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name);
+ entry = getpwuid (statbuf.st_uid);
+
+ if ((f = fopen (pathname, "r")) != NULL)
+ {
+ size_t len = fread (cmd, 1, sizeof (cmd) - 1, f);
+ if (len > 0)
+ {
+ int i;
+ for (i = 0; i < len; i++)
+ if (cmd[i] == '\0')
+ cmd[i] = ' ';
+ cmd[len] = '\0';
+
+ obstack_xml_printf (
+ &obstack,
+ "<item>"
+ "<column name=\"pid\">%s</column>"
+ "<column name=\"user\">%s</column>"
+ "<column name=\"command\">%s</column>"
+ "</item>",
+ dp->d_name,
+ entry ? entry->pw_name : "?",
+ cmd);
+ }
+ fclose (f);
+ }
+
+ xfree (pathname);
+ }
+ }
+
+ closedir (dirp);
+ }
+
+ obstack_grow_str0 (&obstack, "</osdata>\n");
+ buf = obstack_finish (&obstack);
+ len_avail = strlen (buf);
+ }
+
+ if (offset >= len_avail)
+ {
+ /* Done. Get rid of the obstack. */
+ obstack_free (&obstack, NULL);
+ buf = NULL;
+ len_avail = 0;
+ return 0;
+ }
+
+ if (len > len_avail - offset)
+ len = len_avail - offset;
+ memcpy (readbuf, buf + offset, len);
+
+ return len;
}
static LONGEST
return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
offset, len);
+ if (object == TARGET_OBJECT_OSDATA)
+ return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
offset, len);
if (xfer != 0)
return;
}
+/* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
+ event came out. */
+
static int
-send_sigint_callback (struct lwp_info *lp, void *data)
+linux_nat_stop_lwp (struct lwp_info *lwp, void *data)
{
- /* Use is_running instead of !lp->stopped, because the lwp may be
- stopped due to an internal event, and we want to interrupt it in
- that case too. What we want is to check if the thread is stopped
- from the point of view of the user. */
- if (is_running (lp->ptid))
- kill_lwp (GET_LWP (lp->ptid), SIGINT);
+ ptid_t ptid = * (ptid_t *) data;
+
+ if (ptid_equal (lwp->ptid, ptid)
+ || ptid_equal (minus_one_ptid, ptid)
+ || (ptid_is_pid (ptid)
+ && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid)))
+ {
+ if (!lwp->stopped)
+ {
+ int pid, status;
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNSL: running -> suspending %s\n",
+ target_pid_to_str (lwp->ptid));
+
+ /* Peek once, to check if we've already waited for this
+ LWP. */
+ pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
+ lwp->cloned ? __WCLONE : 0, 1 /* peek */);
+
+ if (pid == -1)
+ {
+ ptid_t ptid = lwp->ptid;
+
+ stop_callback (lwp, NULL);
+ stop_wait_callback (lwp, NULL);
+
+ /* If the lwp exits while we try to stop it, there's
+ nothing else to do. */
+ lwp = find_lwp_pid (ptid);
+ if (lwp == NULL)
+ return 0;
+
+ pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
+ lwp->cloned ? __WCLONE : 0,
+ 1 /* peek */);
+ }
+
+ /* If we didn't collect any signal other than SIGSTOP while
+ stopping the LWP, push a SIGNAL_0 event. In either case,
+ the event-loop will end up calling target_wait which will
+ collect these. */
+ if (pid == -1)
+ push_waitpid (ptid_get_lwp (lwp->ptid), W_STOPCODE (0),
+ lwp->cloned ? __WCLONE : 0);
+ }
+ else
+ {
+ /* Already known to be stopped; do nothing. */
+
+ if (debug_linux_nat)
+ {
+ if (find_thread_pid (lwp->ptid)->stop_requested)
+ fprintf_unfiltered (gdb_stdlog, "\
+LNSL: already stopped/stop_requested %s\n",
+ target_pid_to_str (lwp->ptid));
+ else
+ fprintf_unfiltered (gdb_stdlog, "\
+LNSL: already stopped/no stop_requested yet %s\n",
+ target_pid_to_str (lwp->ptid));
+ }
+ }
+ }
return 0;
}
{
if (non_stop)
{
- if (ptid_equal (ptid, minus_one_ptid))
- iterate_over_lwps (send_sigint_callback, &ptid);
- else
- {
- struct lwp_info *lp = find_lwp_pid (ptid);
- send_sigint_callback (lp, NULL);
- }
+ linux_nat_async_events (sigchld_sync);
+ iterate_over_lwps (linux_nat_stop_lwp, &ptid);
+ target_async (inferior_event_handler, 0);
}
else
linux_ops->to_stop (ptid);
also want to be used for single-threaded processes. */
add_target (t);
-
- /* TODO: Eliminate this and have libthread_db use
- find_target_beneath. */
- thread_db_init (t);
}
/* Register a method to call whenever a new thread is attached. */
projects / binutils-gdb.git / blobdiff