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* linux-low.c (linux_tracefork_grandchild): New.

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(linux_tracefork_child): Use clone.
	(linux_test_for_tracefork): Use clone; allocate and free a stack.
This commit is contained in:
Daniel Jacobowitz
2007-11-01 19:19:39 +00:00
parent 7ce189b305
commit 51c2684ec1
2 changed files with 23 additions and 9 deletions
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6
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,9 @@
2007-11-01 Daniel Jacobowitz <dan@codesourcery.com>
* linux-low.c (linux_tracefork_grandchild): New.
(linux_tracefork_child): Use clone.
(linux_test_for_tracefork): Use clone; allocate and free a stack.
2007-10-31 Joel Brobecker <brobecker@adacore.com> 2007-10-31 Joel Brobecker <brobecker@adacore.com>
* Makefile.in: Use $(SHELL) instead of "sh" to call regdat.sh. * Makefile.in: Use $(SHELL) instead of "sh" to call regdat.sh.

26
gdb/gdbserver/linux-low.c
View File

@ -1732,14 +1732,20 @@ linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
static int linux_supports_tracefork_flag; static int linux_supports_tracefork_flag;
/* A helper function for linux_test_for_tracefork, called after fork (). */ /* Helper functions for linux_test_for_tracefork, called via clone (). */
static void static int
linux_tracefork_child (void) linux_tracefork_grandchild (void *arg)
{
_exit (0);
}
static int
linux_tracefork_child (void *arg)
{ {
ptrace (PTRACE_TRACEME, 0, 0, 0); ptrace (PTRACE_TRACEME, 0, 0, 0);
kill (getpid (), SIGSTOP); kill (getpid (), SIGSTOP);
fork (); clone (linux_tracefork_grandchild, arg, CLONE_VM | SIGCHLD, NULL);
_exit (0); _exit (0);
} }
@ -1767,15 +1773,15 @@ linux_test_for_tracefork (void)
{ {
int child_pid, ret, status; int child_pid, ret, status;
long second_pid; long second_pid;
char *stack = malloc (8192);
linux_supports_tracefork_flag = 0; linux_supports_tracefork_flag = 0;
child_pid = fork (); /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
child_pid = clone (linux_tracefork_child, stack + 2048,
CLONE_VM | SIGCHLD, stack + 6144);
if (child_pid == -1) if (child_pid == -1)
perror_with_name ("fork"); perror_with_name ("clone");
if (child_pid == 0)
linux_tracefork_child ();
ret = my_waitpid (child_pid, &status, 0); ret = my_waitpid (child_pid, &status, 0);
if (ret == -1) if (ret == -1)
@ -1840,6 +1846,8 @@ linux_test_for_tracefork (void)
my_waitpid (child_pid, &status, 0); my_waitpid (child_pid, &status, 0);
} }
while (WIFSTOPPED (status)); while (WIFSTOPPED (status));
free (stack);
} }