[PATCH] uml: move libc-dependent code from signal_user.c
The serial UML OS-abstraction layer patch (um/kernel dir).
This moves all systemcalls from signal_user.c file under os-Linux dir
Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index c7bfd5e..c1f46a0f 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -4,9 +4,22 @@
*/
#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/mman.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "signal_kern.h"
+#include "sysdep/sigcontext.h"
+#include "sysdep/signal.h"
+#include "sigcontext.h"
#include "time_user.h"
#include "mode.h"
-#include "sysdep/signal.h"
void sig_handler(ARCH_SIGHDLR_PARAM)
{
@@ -36,13 +49,138 @@
switch_timers(1);
}
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
+void set_sigstack(void *sig_stack, int size)
+{
+ stack_t stack = ((stack_t) { .ss_flags = 0,
+ .ss_sp = (__ptr_t) sig_stack,
+ .ss_size = size - sizeof(void *) });
+
+ if(sigaltstack(&stack, NULL) != 0)
+ panic("enabling signal stack failed, errno = %d\n", errno);
+}
+
+void remove_sigstack(void)
+{
+ stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
+ .ss_sp = NULL,
+ .ss_size = 0 });
+
+ if(sigaltstack(&stack, NULL) != 0)
+ panic("disabling signal stack failed, errno = %d\n", errno);
+}
+
+void set_handler(int sig, void (*handler)(int), int flags, ...)
+{
+ struct sigaction action;
+ va_list ap;
+ int mask;
+
+ va_start(ap, flags);
+ action.sa_handler = handler;
+ sigemptyset(&action.sa_mask);
+ while((mask = va_arg(ap, int)) != -1){
+ sigaddset(&action.sa_mask, mask);
+ }
+ va_end(ap);
+ action.sa_flags = flags;
+ action.sa_restorer = NULL;
+ if(sigaction(sig, &action, NULL) < 0)
+ panic("sigaction failed");
+}
+
+int change_sig(int signal, int on)
+{
+ sigset_t sigset, old;
+
+ sigemptyset(&sigset);
+ sigaddset(&sigset, signal);
+ sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
+ return(!sigismember(&old, signal));
+}
+
+/* Both here and in set/get_signal we don't touch SIGPROF, because we must not
+ * disable profiling; it's safe because the profiling code does not interact
+ * with the kernel code at all.*/
+
+static void change_signals(int type)
+{
+ sigset_t mask;
+
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ sigaddset(&mask, SIGIO);
+ if(sigprocmask(type, &mask, NULL) < 0)
+ panic("Failed to change signal mask - errno = %d", errno);
+}
+
+void block_signals(void)
+{
+ change_signals(SIG_BLOCK);
+}
+
+void unblock_signals(void)
+{
+ change_signals(SIG_UNBLOCK);
+}
+
+/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
+ * together under SIGVTALRM_BIT. SIGPROF is excluded because we want to
+ * be able to profile all of UML, not just the non-critical sections. If
+ * profiling is not thread-safe, then that is not my problem. We can disable
+ * profiling when SMP is enabled in that case.
*/
+#define SIGIO_BIT 0
+#define SIGVTALRM_BIT 1
+
+static int enable_mask(sigset_t *mask)
+{
+ int sigs;
+
+ sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
+ sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
+ sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
+ return(sigs);
+}
+
+int get_signals(void)
+{
+ sigset_t mask;
+
+ if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
+ panic("Failed to get signal mask");
+ return(enable_mask(&mask));
+}
+
+int set_signals(int enable)
+{
+ sigset_t mask;
+ int ret;
+
+ sigemptyset(&mask);
+ if(enable & (1 << SIGIO_BIT))
+ sigaddset(&mask, SIGIO);
+ if(enable & (1 << SIGVTALRM_BIT)){
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ }
+
+ /* This is safe - sigprocmask is guaranteed to copy locally the
+ * value of new_set, do his work and then, at the end, write to
+ * old_set.
+ */
+ if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
+ panic("Failed to enable signals");
+ ret = enable_mask(&mask);
+ sigemptyset(&mask);
+ if((enable & (1 << SIGIO_BIT)) == 0)
+ sigaddset(&mask, SIGIO);
+ if((enable & (1 << SIGVTALRM_BIT)) == 0){
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ }
+ if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
+ panic("Failed to block signals");
+
+ return(ret);
+}