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authorMikael Pettersson <[email protected]>2016-01-31 15:11:15 +0100
committerMikael Pettersson <[email protected]>2016-01-31 15:49:44 +0100
commit18955a72ddf9190f9850cb6b143fd39ff8ab6168 (patch)
tree88625d5176870c58f5f38e3a807b2fcdececfd81 /erts/emulator
parent57a928b4bc1076b169ecc95e38ab23cf79e03280 (diff)
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hipe_x86_signal: cleanups
- remove glibc < 2.3 code - move glibc-2.2 comment to glibc >= 2.3 block - remove obsolete "only supports" comment - remove support for broken sigaltstack() in pre-2.4 Linux kernels
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/hipe/hipe_x86_signal.c80
1 files changed, 6 insertions, 74 deletions
diff --git a/erts/emulator/hipe/hipe_x86_signal.c b/erts/emulator/hipe/hipe_x86_signal.c
index b7dae88417..6887bdacbc 100644
--- a/erts/emulator/hipe/hipe_x86_signal.c
+++ b/erts/emulator/hipe/hipe_x86_signal.c
@@ -38,9 +38,6 @@
*
* Our solution is to override the C library's signal handler setup
* procedure with our own which enforces the SA_ONSTACK flag.
- *
- * XXX: This code only supports Linux with glibc-2.1 or above,
- * and Solaris 8.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
@@ -55,27 +52,6 @@
#include "hipe_signal.h"
#if __GLIBC__ == 2 && (__GLIBC_MINOR__ >= 3)
-/* See comment below for glibc 2.2. */
-#ifndef __USE_GNU
-#define __USE_GNU /* to un-hide RTLD_NEXT */
-#endif
-#include <dlfcn.h>
-static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*);
-#define init_done() (__next_sigaction != 0)
-extern int __sigaction(int, const struct sigaction*, struct sigaction*);
-#define __SIGACTION __sigaction
-static void do_init(void)
-{
- __next_sigaction = dlsym(RTLD_NEXT, "__sigaction");
- if (__next_sigaction != 0)
- return;
- perror("dlsym");
- abort();
-}
-#define INIT() do { if (!init_done()) do_init(); } while (0)
-#endif /* glibc 2.3 */
-
-#if __GLIBC__ == 2 && (__GLIBC_MINOR__ == 2 /*|| __GLIBC_MINOR__ == 3*/)
/*
* __libc_sigaction() is the core routine.
* Without libpthread, sigaction() and __sigaction() are both aliases
@@ -100,16 +76,14 @@ static void do_init(void)
* old BSD or SysV interfaces.
* glibc's internal calls to __sigaction() appear to be mostly safe.
* hipe_signal_init() fixes some unsafe ones, e.g. the SIGPROF handler.
- *
- * Tested with glibc-2.1.92 on RedHat 7.0, glibc-2.2.2 on RedHat 7.1,
- * glibc-2.2.4 on RedHat 7.2, and glibc-2.2.5 on RedHat 7.3.
*/
-#if 0
-/* works with 2.2.5 and 2.2.4, but not 2.2.2 or 2.1.92 */
+#ifndef __USE_GNU
#define __USE_GNU /* to un-hide RTLD_NEXT */
+#endif
#include <dlfcn.h>
static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*);
#define init_done() (__next_sigaction != 0)
+extern int __sigaction(int, const struct sigaction*, struct sigaction*);
#define __SIGACTION __sigaction
static void do_init(void)
{
@@ -120,45 +94,7 @@ static void do_init(void)
abort();
}
#define INIT() do { if (!init_done()) do_init(); } while (0)
-#else
-/* semi-works with all 2.2 versions so far */
-extern int __sigaction(int, const struct sigaction*, struct sigaction*);
-#define __next_sigaction __sigaction /* pthreads-aware version */
-#undef __SIGACTION /* we can't override __sigaction() */
-#define INIT() do{}while(0)
-#endif
-#endif /* glibc 2.2 */
-
-#if __GLIBC__ == 2 && __GLIBC_MINOR__ == 1
-/*
- * __sigaction() is the core routine.
- * Without libpthread, sigaction() is an alias for __sigaction().
- * libpthread redefines sigaction() as a non-trivial wrapper around
- * __sigaction().
- * glibc has internal calls to both sigaction() and __sigaction().
- *
- * Overriding __sigaction() would be ideal, but doing so breaks
- * libpthread (threads hang). Instead we override sigaction() and
- * use dlsym RTLD_NEXT to find glibc's version of sigaction().
- * glibc's internal calls to __sigaction() appear to be mostly safe.
- * hipe_signal_init() fixes some unsafe ones, e.g. the SIGPROF handler.
- *
- * Tested with glibc-2.1.3 on RedHat 6.2.
- */
-#include <dlfcn.h>
-static int (*__next_sigaction)(int, const struct sigaction*, struct sigaction*);
-#define init_done() (__next_sigaction != 0)
-#undef __SIGACTION
-static void do_init(void)
-{
- __next_sigaction = dlsym(RTLD_NEXT, "sigaction");
- if (__next_sigaction != 0)
- return;
- perror("dlsym");
- abort();
-}
-#define INIT() do { if (!init_done()) do_init(); } while (0)
-#endif /* glibc 2.1 */
+#endif /* glibc >= 2.3 */
/* Is there no standard identifier for Darwin/MacOSX ? */
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
@@ -339,12 +275,8 @@ static void hipe_sigaltstack(void *ss_sp)
ss.ss_flags = SS_ONSTACK;
ss.ss_size = SIGSTKSZ;
if (sigaltstack(&ss, NULL) < 0) {
- /* might be a broken pre-2.4 Linux kernel, try harder */
- ss.ss_flags = 0;
- if (sigaltstack(&ss, NULL) < 0) {
- perror("sigaltstack");
- abort();
- }
+ perror("sigaltstack");
+ abort();
}
}