linux-user: Add pidfd_open(), pidfd_send_signal() and pidfd_getfd() syscalls

I noticed those were missing when running the glib2.0 testsuite.
Add the syscalls including the strace output.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220918194555.83535-4-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

3 files changed, 71 insertions, 0 deletions

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 816e679995..5ac64df02b 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -3317,6 +3317,34 @@ print_openat(CPUArchState *cpu_env, const struct syscallname *name,
 }
 #endif
 
+#ifdef TARGET_NR_pidfd_send_signal
+static void
+print_pidfd_send_signal(CPUArchState *cpu_env, const struct syscallname *name,
+                abi_long arg0, abi_long arg1, abi_long arg2,
+                abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    void *p;
+    target_siginfo_t uinfo;
+
+    print_syscall_prologue(name);
+    print_raw_param("%d", arg0, 0);
+    print_signal(arg1, 0);
+
+    p = lock_user(VERIFY_READ, arg2, sizeof(target_siginfo_t), 1);
+    if (p) {
+        get_target_siginfo(&uinfo, p);
+        print_siginfo(&uinfo);
+
+        unlock_user(p, arg2, 0);
+    } else {
+        print_pointer(arg2, 1);
+    }
+
+    print_raw_param("%u", arg3, 0);
+    print_syscall_epilogue(name);
+}
+#endif
+
 #ifdef TARGET_NR_mq_unlink
 static void
 print_mq_unlink(CPUArchState *cpu_env, const struct syscallname *name,
diff --git a/linux-user/strace.list b/linux-user/strace.list
index a78cdf3cdf..4d8b7f6a5e 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -1664,6 +1664,15 @@
 #ifdef TARGET_NR_pipe2
 { TARGET_NR_pipe2, "pipe2", NULL, NULL, NULL },
 #endif
+#ifdef TARGET_NR_pidfd_open
+{ TARGET_NR_pidfd_open, "pidfd_open", "%s(%d,%u)", NULL, NULL },
+#endif
+#ifdef TARGET_NR_pidfd_send_signal
+{ TARGET_NR_pidfd_send_signal, "pidfd_send_signal", NULL, print_pidfd_send_signal, NULL },
+#endif
+#ifdef TARGET_NR_pidfd_getfd
+{ TARGET_NR_pidfd_getfd, "pidfd_getfd", "%s(%d,%d,%u)", NULL, NULL },
+#endif
 #ifdef TARGET_NR_atomic_cmpxchg_32
 { TARGET_NR_atomic_cmpxchg_32, "atomic_cmpxchg_32", NULL, NULL, NULL },
 #endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index abf82bab2a..850410c9b5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -346,6 +346,16 @@ _syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
 _syscall6(int,sys_futex_time64,int *,uaddr,int,op,int,val,
           const struct timespec *,timeout,int *,uaddr2,int,val3)
 #endif
+#if defined(__NR_pidfd_open) && defined(TARGET_NR_pidfd_open)
+_syscall2(int, pidfd_open, pid_t, pid, unsigned int, flags);
+#endif
+#if defined(__NR_pidfd_send_signal) && defined(TARGET_NR_pidfd_send_signal)
+_syscall4(int, pidfd_send_signal, int, pidfd, int, sig, siginfo_t *, info,
+                             unsigned int, flags);
+#endif
+#if defined(__NR_pidfd_getfd) && defined(TARGET_NR_pidfd_getfd)
+_syscall3(int, pidfd_getfd, int, pidfd, int, targetfd, unsigned int, flags);
+#endif
 #define __NR_sys_sched_getaffinity __NR_sched_getaffinity
 _syscall3(int, sys_sched_getaffinity, pid_t, pid, unsigned int, len,
           unsigned long *, user_mask_ptr);
@@ -8684,6 +8694,30 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
         fd_trans_unregister(ret);
         return ret;
 #endif
+#if defined(__NR_pidfd_open) && defined(TARGET_NR_pidfd_open)
+    case TARGET_NR_pidfd_open:
+        return get_errno(pidfd_open(arg1, arg2));
+#endif
+#if defined(__NR_pidfd_send_signal) && defined(TARGET_NR_pidfd_send_signal)
+    case TARGET_NR_pidfd_send_signal:
+        {
+            siginfo_t uinfo;
+
+            p = lock_user(VERIFY_READ, arg3, sizeof(target_siginfo_t), 1);
+            if (!p) {
+                return -TARGET_EFAULT;
+            }
+            target_to_host_siginfo(&uinfo, p);
+            unlock_user(p, arg3, 0);
+            ret = get_errno(pidfd_send_signal(arg1, target_to_host_signal(arg2),
+                &uinfo, arg4));
+        }
+        return ret;
+#endif
+#if defined(__NR_pidfd_getfd) && defined(TARGET_NR_pidfd_getfd)
+    case TARGET_NR_pidfd_getfd:
+        return get_errno(pidfd_getfd(arg1, arg2, arg3));
+#endif
     case TARGET_NR_close:
         fd_trans_unregister(arg1);
         return get_errno(close(arg1));