From 9b59a39f42393f6f51ebedfb2a375049cae785fd Mon Sep 17 00:00:00 2001
From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
Date: Tue, 16 Apr 2013 13:06:20 +0000
Subject: [PATCH] [sanitizer] Implement wait4 and waitpid syscall hooks.

llvm-svn: 179592
---
 .../include/sanitizer/linux_syscall_hooks.h   |  9 +++--
 .../sanitizer_common_syscalls.inc             | 38 +++++++++++++++++++
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/compiler-rt/include/sanitizer/linux_syscall_hooks.h b/compiler-rt/include/sanitizer/linux_syscall_hooks.h
index 4c05f09419c9..5b0e5ecfb8ef 100644
--- a/compiler-rt/include/sanitizer/linux_syscall_hooks.h
+++ b/compiler-rt/include/sanitizer/linux_syscall_hooks.h
@@ -29,11 +29,15 @@ void __sanitizer_syscall_pre_rt_sigpending(void *p, size_t s);
 void __sanitizer_syscall_pre_getdents(int fd, void *dirp, int count);
 void __sanitizer_syscall_pre_getdents64(int fd, void *dirp, int count);
 void __sanitizer_syscall_pre_recvmsg(int sockfd, void *msg, int flags);
+void __sanitizer_syscall_pre_wait4(int pid, int* status, int options, void* r);
+void __sanitizer_syscall_pre_waitpid(int pid, int *status, int options);
 
 void __sanitizer_syscall_post_rt_sigpending(long res, void *p, size_t s);
 void __sanitizer_syscall_post_getdents(long res, int fd, void *dirp, int count);
 void __sanitizer_syscall_post_getdents64(long res, int fd, void *dirp, int count);
 void __sanitizer_syscall_post_recvmsg(long res, int sockfd, void *msg, int flags);
+void __sanitizer_syscall_post_wait4(long res, int pid, int* status, int options, void* r);
+void __sanitizer_syscall_post_waitpid(long res, int pid, int *status, int options);
 
 // And now a few syscalls we don't handle yet.
 
@@ -408,11 +412,10 @@ void __sanitizer_syscall_post_recvmsg(long res, int sockfd, void *msg, int flags
 #define __sanitizer_syscall_pre_vm86old(...)
 #define __sanitizer_syscall_pre_vmsplice(...)
 #define __sanitizer_syscall_pre_vserver(...)
-#define __sanitizer_syscall_pre_wait4(...)
 #define __sanitizer_syscall_pre_waitid(...)
-#define __sanitizer_syscall_pre_waitpid(...)
 #define __sanitizer_syscall_pre_write(...)
 #define __sanitizer_syscall_pre_writev(...)
+
 #define __sanitizer_syscall_post_accept4(res, ...)
 #define __sanitizer_syscall_post_accept(res, ...)
 #define __sanitizer_syscall_post_access(res, ...)
@@ -784,9 +787,7 @@ void __sanitizer_syscall_post_recvmsg(long res, int sockfd, void *msg, int flags
 #define __sanitizer_syscall_post_vm86(res, ...)
 #define __sanitizer_syscall_post_vmsplice(res, ...)
 #define __sanitizer_syscall_post_vserver(res, ...)
-#define __sanitizer_syscall_post_wait4(res, ...)
 #define __sanitizer_syscall_post_waitid(res, ...)
-#define __sanitizer_syscall_post_waitpid(res, ...)
 #define __sanitizer_syscall_post_write(res, ...)
 #define __sanitizer_syscall_post_writev(res, ...)
 
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc
index 8f9659019d3e..753f80fa1488 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc
@@ -56,6 +56,16 @@ struct sanitizer_kernel_msghdr {
   unsigned msg_flags;
 };
 
+struct sanitizer_kernel_timeval {
+  long tv_sec;
+  long tv_usec;
+};
+
+struct sanitizer_kernel_rusage {
+  struct sanitizer_kernel_timeval ru_timeval[2];
+  long ru_long[14];
+};
+
 PRE_SYSCALL(recvmsg)(int sockfd, struct sanitizer_kernel_msghdr *msg,
                      int flags) {
   PRE_READ(msg, sizeof(*msg));
@@ -92,6 +102,34 @@ POST_SYSCALL(getdents64)(long res, int fd, void *dirp, int count) {
     POST_WRITE(dirp, res);
 }
 
+PRE_SYSCALL(wait4)(int pid, int *status, int options,
+                   struct sanitizer_kernel_rusage *r) {
+  if (status)
+    PRE_WRITE(status, sizeof(*status));
+  if (r)
+    PRE_WRITE(r, sizeof(*r));
+}
+
+POST_SYSCALL(wait4)(long res, int pid, int *status, int options,
+                    struct sanitizer_kernel_rusage *r) {
+  if (res > 0) {
+    if (status)
+      POST_WRITE(status, sizeof(*status));
+    if (r)
+      POST_WRITE(r, sizeof(*r));
+  }
+}
+
+PRE_SYSCALL(waitpid)(int pid, int *status, int options) {
+  if (status)
+    PRE_WRITE(status, sizeof(*status));
+}
+
+POST_SYSCALL(waitpid)(long res, int pid, int *status, int options) {
+  if (res > 0 && status)
+    POST_WRITE(status, sizeof(*status));
+}
+
 }  // extern "C"
 
 #undef PRE_SYSCALL