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authorIngo Molnar <mingo@elte.hu>2009-06-06 22:33:43 +0400
committerIngo Molnar <mingo@elte.hu>2009-06-06 22:33:43 +0400
commit864709302a80f26fa9da3be5b47304f0b8bae192 (patch)
tree8c2bab78f141fe43a38914bd3e3aae0a88f958e5 /tools/perf/util/sigchain.c
parent75b5032212641f6d38ac041416945e70da833b68 (diff)
downloadlinux-864709302a80f26fa9da3be5b47304f0b8bae192.tar.xz
perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/
Several people have suggested that 'perf' has become a full-fledged tool that should be moved out of Documentation/. Move it to the (new) tools/ directory. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/sigchain.c')
-rw-r--r--tools/perf/util/sigchain.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/tools/perf/util/sigchain.c b/tools/perf/util/sigchain.c
new file mode 100644
index 000000000000..1118b99e57d3
--- /dev/null
+++ b/tools/perf/util/sigchain.c
@@ -0,0 +1,52 @@
+#include "sigchain.h"
+#include "cache.h"
+
+#define SIGCHAIN_MAX_SIGNALS 32
+
+struct sigchain_signal {
+ sigchain_fun *old;
+ int n;
+ int alloc;
+};
+static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
+
+static void check_signum(int sig)
+{
+ if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS)
+ die("BUG: signal out of range: %d", sig);
+}
+
+int sigchain_push(int sig, sigchain_fun f)
+{
+ struct sigchain_signal *s = signals + sig;
+ check_signum(sig);
+
+ ALLOC_GROW(s->old, s->n + 1, s->alloc);
+ s->old[s->n] = signal(sig, f);
+ if (s->old[s->n] == SIG_ERR)
+ return -1;
+ s->n++;
+ return 0;
+}
+
+int sigchain_pop(int sig)
+{
+ struct sigchain_signal *s = signals + sig;
+ check_signum(sig);
+ if (s->n < 1)
+ return 0;
+
+ if (signal(sig, s->old[s->n - 1]) == SIG_ERR)
+ return -1;
+ s->n--;
+ return 0;
+}
+
+void sigchain_push_common(sigchain_fun f)
+{
+ sigchain_push(SIGINT, f);
+ sigchain_push(SIGHUP, f);
+ sigchain_push(SIGTERM, f);
+ sigchain_push(SIGQUIT, f);
+ sigchain_push(SIGPIPE, f);
+}