Replace 'struct ucontext' with 'ucontext_t' type

glibc used to have:

   typedef struct ucontext { ... } ucontext_t;

glibc now has:

   typedef struct ucontext_t { ... } ucontext_t;

(See https://sourceware.org/bugzilla/show_bug.cgi?id=21457
 for detail and rationale for the glibc change)

However, QEMU used "struct ucontext" in declarations. This is a
private name and compatibility cannot be guaranteed. Switch to
only using the standardized type name.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Message-id: 20170628204452.41230-1-raj.khem@gmail.com
Cc: Kamil Rytarowski <kamil@netbsd.org>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Laurent Vivier <laurent@vivier.eu>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[PMM: Rewrote commit message, based mostly on the one from
 Nathaniel McCallum]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

7 files changed, 11 insertions, 11 deletions

diff --git a/linux-user/host/aarch64/hostdep.h b/linux-user/host/aarch64/hostdep.h
index 64f75ce..a8d41a2 100644
--- a/linux-user/host/aarch64/hostdep.h
+++ b/linux-user/host/aarch64/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     __u64 *pcreg = &uc->uc_mcontext.pc;
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/host/arm/hostdep.h b/linux-user/host/arm/hostdep.h
index 5c1ae60..9276fe6 100644
--- a/linux-user/host/arm/hostdep.h
+++ b/linux-user/host/arm/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     unsigned long *pcreg = &uc->uc_mcontext.arm_pc;
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/host/i386/hostdep.h b/linux-user/host/i386/hostdep.h
index d834bd8..073be74 100644
--- a/linux-user/host/i386/hostdep.h
+++ b/linux-user/host/i386/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     greg_t *pcreg = &uc->uc_mcontext.gregs[REG_EIP];
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/host/ppc64/hostdep.h b/linux-user/host/ppc64/hostdep.h
index 0b0f5f7..98979ad 100644
--- a/linux-user/host/ppc64/hostdep.h
+++ b/linux-user/host/ppc64/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     unsigned long *pcreg = &uc->uc_mcontext.gp_regs[PT_NIP];
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/host/s390x/hostdep.h b/linux-user/host/s390x/hostdep.h
index 6f9da9c..4f0171f 100644
--- a/linux-user/host/s390x/hostdep.h
+++ b/linux-user/host/s390x/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     unsigned long *pcreg = &uc->uc_mcontext.psw.addr;
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/host/x86_64/hostdep.h b/linux-user/host/x86_64/hostdep.h
index 3b42596..a4fefb5 100644
--- a/linux-user/host/x86_64/hostdep.h
+++ b/linux-user/host/x86_64/hostdep.h
@@ -24,7 +24,7 @@ extern char safe_syscall_end[];
 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
 static inline void rewind_if_in_safe_syscall(void *puc)
 {
-    struct ucontext *uc = puc;
+    ucontext_t *uc = puc;
     greg_t *pcreg = &uc->uc_mcontext.gregs[REG_RIP];
 
     if (*pcreg > (uintptr_t)safe_syscall_start
diff --git a/linux-user/signal.c b/linux-user/signal.c
index d68bd26..cc0c3fc 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -3346,7 +3346,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     *
     *   a0 = signal number
     *   a1 = pointer to siginfo_t
-    *   a2 = pointer to struct ucontext
+    *   a2 = pointer to ucontext_t
     *
     * $25 and PC point to the signal handler, $29 points to the
     * struct sigframe.
@@ -3764,7 +3764,7 @@ struct target_signal_frame {
 
 struct rt_signal_frame {
     siginfo_t info;
-    struct ucontext uc;
+    ucontext_t uc;
     uint32_t tramp[2];
 };
 
@@ -3980,7 +3980,7 @@ struct rt_signal_frame {
     siginfo_t *pinfo;
     void *puc;
     siginfo_t info;
-    struct ucontext uc;
+    ucontext_t uc;
     uint16_t retcode[4];      /* Trampoline code. */
 };
 
@@ -4515,7 +4515,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
         tswap_siginfo(&frame->info, info);
     }
 
-    /*err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));*/
+    /*err |= __clear_user(&frame->uc, offsetof(ucontext_t, uc_mcontext));*/
     __put_user(0, &frame->uc.tuc_flags);
     __put_user(0, &frame->uc.tuc_link);
     __put_user(target_sigaltstack_used.ss_sp,
@@ -5007,7 +5007,7 @@ enum {
 
 struct target_ucontext {
     target_ulong tuc_flags;
-    target_ulong tuc_link;    /* struct ucontext __user * */
+    target_ulong tuc_link;    /* ucontext_t __user * */
     struct target_sigaltstack tuc_stack;
 #if !defined(TARGET_PPC64)
     int32_t tuc_pad[7];