commit da2a34f7f9999da09f6c307b40b66eba8cc38283
author Peter Maydell <peter.maydell@linaro.org> Mon Jun 06 19:58:19 2016 +0100
committer Riku Voipio <riku.voipio@linaro.org> Wed Jun 08 12:06:57 2016 +0300
tree 8143433a8cafa45a4eff948cef87f80b6ff0ea44
parent 7dcdaeafe07dd87079c4e073bced4cfc8bf5fdf3

linux-user: Special-case ERESTARTSYS in target_strerror()

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>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 262c645..bd8095c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -632,6 +632,13 @@
 
 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;
     }