forked from pool/glibc
60 lines
1.5 KiB
Diff
60 lines
1.5 KiB
Diff
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2013-07-31 Andreas Schwab <schwab@suse.de>
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* elf/pldd.c (wait_for_ptrace_stop): New function.
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(main): Call it after attaching.
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Index: glibc-2.17/elf/pldd.c
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===================================================================
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--- glibc-2.17.orig/elf/pldd.c
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+++ glibc-2.17/elf/pldd.c
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@@ -34,6 +34,7 @@
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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+#include <sys/wait.h>
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#include <ldsodefs.h>
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#include <version.h>
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@@ -85,6 +86,7 @@ static char *exe;
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/* Local functions. */
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static int get_process_info (int dfd, long int pid);
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+static void wait_for_ptrace_stop (long int pid);
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int
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@@ -173,6 +175,8 @@ main (int argc, char *argv[])
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tid);
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}
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+ wait_for_ptrace_stop (tid);
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+
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struct thread_list *newp = alloca (sizeof (*newp));
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newp->tid = tid;
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newp->next = thread_list;
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@@ -197,6 +201,24 @@ main (int argc, char *argv[])
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}
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+/* Wait for PID to enter ptrace-stop state after being attached. */
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+static void
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+wait_for_ptrace_stop (long int pid)
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+{
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+ int status;
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+
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+ /* While waiting for SIGSTOP being delivered to the tracee we have to
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+ reinject any other pending signal. Ignore all other errors. */
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+ while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status))
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+ {
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+ /* The STOP signal should not be delivered to the tracee. */
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+ if (WSTOPSIG (status) == SIGSTOP)
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+ return;
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+ ptrace (PTRACE_CONT, pid, NULL, (void *) (uintptr_t) WSTOPSIG (status));
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+ }
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+}
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+
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+
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/* Handle program arguments. */
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static error_t
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parse_opt (int key, char *arg, struct argp_state *state)
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