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[v6,07/10] linux-user: Fix msgrcv() and msgsnd() syscalls support

Message ID 20160922150646.78163-8-aleksandar.markovic@rt-rk.com (mailing list archive)
State New, archived
Headers show

Commit Message

Aleksandar Markovic Sept. 22, 2016, 3:06 p.m. UTC 
From: Aleksandar Markovic <aleksandar.markovic@imgtec.com>

If syscalls msgrcv() and msgsnd() fail, they return E2BIG, EACCES,
EAGAIN, EFAULT, EIDRM, EINTR, EINVAL, ENOMEM, or ENOMSG.

By examining negative scenarios of these syscalls for Mips, it was
established that ENOMSG does not have the same value accross all
platforms, but it is nevertheless not included for conversion in
the correspondant conversion table defined in linux-user/syscall.c.
This is certainly a bug, since it leads to the incorrect emulation
of msgrcv() and msgsnd() for scenarios involving ENOMSG.

This patch fixes this by extending the conversion table to include
ENOMSG.

Also, LTP test msgrcv04 will be fixed for some platforms.

Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/syscall.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 93dacd7..a6103b8 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -750,6 +750,9 @@  static uint16_t host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
 #ifdef ENOTRECOVERABLE
     [ENOTRECOVERABLE]	= TARGET_ENOTRECOVERABLE,
 #endif
+#ifdef ENOMSG
+    [ENOMSG]            = TARGET_ENOMSG,
+#endif
 };
 
 static inline int host_to_target_errno(int err)