[Qemu-devel] [PATCH 18/18] linux-user: Special-case ERESTARTSYS in target_strerror()

[Peter Maydell <peter.maydell@linaro.org>]

Since TARGET_ERESTARTSYS and TARGET_ESIGRETURN are internal-to-QEMU
error numbers, handle them specially in target_strerror(), to avoid
confusing strace output like:

9521 rt_sigreturn(14,8,274886297808,8,0,268435456) = -1 errno=513 (Unknown error 513)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/syscall.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index bcee02d..782d475 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -619,6 +619,13 @@ static inline int is_error(abi_long ret)
 
 const char *target_strerror(int err)
 {
+    if (err == TARGET_ERESTARTSYS) {
+        return "To be restarted";
+    }
+    if (err == TARGET_QEMU_ESIGRETURN) {
+        return "Successful exit from sigreturn";
+    }
+
     if ((err >= ERRNO_TABLE_SIZE) || (err < 0)) {
         return NULL;
     }
-- 
1.9.1