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Avoid setting an alternative stack for signals if there is already one

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P=Mike Hommey <mh@glandium.org>
R=ted at http://codereview.appspot.com/5573054/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@918 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2012-02-14 13:21:39 +00:00
parent 199703cbff
commit 87063908ad
2 changed files with 10 additions and 7 deletions
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16
src/client/linux/handler/exception_handler.cc
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@ -187,14 +187,18 @@ bool ExceptionHandler::InstallHandlers() {
// such a small stack. // such a small stack.
static const unsigned kSigStackSize = 8192; static const unsigned kSigStackSize = 8192;
signal_stack = malloc(kSigStackSize);
stack_t stack; stack_t stack;
memset(&stack, 0, sizeof(stack)); // Only set an alternative stack if there isn't already one, or if the current
stack.ss_sp = signal_stack; // one is too small.
stack.ss_size = kSigStackSize; if (sys_sigaltstack(NULL, &stack) == -1 || !stack.ss_sp ||
stack.ss_size < kSigStackSize) {
memset(&stack, 0, sizeof(stack));
stack.ss_sp = malloc(kSigStackSize);
stack.ss_size = kSigStackSize;
if (sys_sigaltstack(&stack, NULL) == -1) if (sys_sigaltstack(&stack, NULL) == -1)
return false; return false;
}
struct sigaction sa; struct sigaction sa;
memset(&sa, 0, sizeof(sa)); memset(&sa, 0, sizeof(sa));

1
src/client/linux/handler/exception_handler.h
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@ -228,7 +228,6 @@ class ExceptionHandler {
const char* next_minidump_id_c_; const char* next_minidump_id_c_;
const bool handler_installed_; const bool handler_installed_;
void* signal_stack; // the handler stack.
HandlerCallback crash_handler_; HandlerCallback crash_handler_;
// The global exception handler stack. This is need becuase there may exist // The global exception handler stack. This is need becuase there may exist