[PATCH v4 04/40] bsd-user: Add signal shims sigwait through kill and os-signal.h

Complete bsd-signal.h with sigwait, sigwaitinfo, sigqueue,
sigaltstack, kill, and killpg. Add FreeBSD-specific os-signal.h
with pdkill.

Signed-off-by: Stacey Son <[email protected]>
Signed-off-by: Kyle Evans <[email protected]>
Assisted-by: Claude Opus 4.6 (1M context)
Reviewed-by: Pierrick Bouvier <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Acked-by: Richard Henderson <[email protected]>
Signed-off-by: Warner Losh <[email protected]>
---
 bsd-user/bsd-signal.h        | 80 ++++++++++++++++++++++++++++++++++++++++++++
 bsd-user/freebsd/os-signal.h | 20 +++++++++++
 2 files changed, 100 insertions(+)

diff --git a/bsd-user/bsd-signal.h b/bsd-user/bsd-signal.h
index 49e58d7436..09c5b30913 100644
--- a/bsd-user/bsd-signal.h
+++ b/bsd-user/bsd-signal.h
@@ -148,4 +148,84 @@ static inline abi_long do_bsd_sigreturn(CPUArchState *env, abi_long arg1)
 /* sigsetmask(2) - not defined */
 /* sigstack(2) - not defined */
 
+/* sigwait(2) */
+static inline abi_long do_bsd_sigwait(abi_ulong arg1, abi_ulong arg2,
+                                      abi_long arg3)
+{
+    abi_long ret;
+    void *p;
+    sigset_t set;
+    int sig;
+
+    p = lock_user(VERIFY_READ, arg1, sizeof(target_sigset_t), 1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    target_to_host_sigset(&set, p);
+    unlock_user(p, arg1, 0);
+    ret = get_errno(sigwait(&set, &sig));
+    if (!is_error(ret) && arg2) {
+        ret = put_user_s32(sig, arg2);
+    }
+    return ret;
+}
+
+/* sigwaitinfo(2) */
+static inline abi_long do_bsd_sigwaitinfo(abi_ulong arg1, abi_ulong arg2)
+{
+    abi_long ret;
+    void *p;
+    sigset_t set;
+    siginfo_t uinfo;
+
+    p = lock_user(VERIFY_READ, arg1, sizeof(target_sigset_t), 1);
+    if (p == NULL) {
+        return -TARGET_EFAULT;
+    }
+    target_to_host_sigset(&set, p);
+    unlock_user(p, arg1, 0);
+    ret = get_errno(sigwaitinfo(&set, &uinfo));
+    if (!is_error(ret) && arg2) {
+        p = lock_user(VERIFY_WRITE, arg2, sizeof(target_siginfo_t), 0);
+        if (p == NULL) {
+            return -TARGET_EFAULT;
+        }
+        host_to_target_siginfo(p, &uinfo);
+        unlock_user(p, arg2, sizeof(target_siginfo_t));
+    }
+    return ret;
+}
+
+/* sigqueue(2) */
+static inline abi_long do_bsd_sigqueue(abi_long arg1, abi_long arg2,
+                                       abi_ulong arg3)
+{
+    union sigval value;
+    target_sigval_t *tvalue = (target_sigval_t *)&arg3;
+    abi_ulong sival_ptr;
+
+    __get_user(sival_ptr, &tvalue->sival_ptr);
+    value.sival_ptr = (void *)(uintptr_t)sival_ptr;
+    return get_errno(sigqueue(arg1, target_to_host_signal(arg2), value));
+}
+
+/* sigaltstck(2) */
+static inline abi_long do_bsd_sigaltstack(CPUArchState *env, abi_ulong arg1,
+                                          abi_ulong arg2)
+{
+    return do_sigaltstack(arg1, arg2, get_sp_from_cpustate(env));
+}
+
+/* kill(2) */
+static inline abi_long do_bsd_kill(abi_long pid, abi_long sig)
+{
+    return get_errno(kill(pid, target_to_host_signal(sig)));
+}
+
+/* killpg(2) */
+static inline abi_long do_bsd_killpg(abi_long pg, abi_long sig)
+{
+   return get_errno(killpg(pg, target_to_host_signal(sig)));
+}
+
 #endif /* BSD_SIGNAL_H */
diff --git a/bsd-user/freebsd/os-signal.h b/bsd-user/freebsd/os-signal.h
new file mode 100644
index 0000000000..fe102c33e4
--- /dev/null
+++ b/bsd-user/freebsd/os-signal.h
@@ -0,0 +1,20 @@
+/*
+ * FreeBSD signal system call shims
+ *
+ * Copyright (c) 2013 Stacey D. Son
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef FREEBSD_OS_SIGNAL_H
+#define FREEBSD_OS_SIGNAL_H
+
+#include <sys/procdesc.h>
+
+/* pdkill(2) */
+static inline abi_long do_freebsd_pdkill(abi_long arg1, abi_long arg2)
+{
+
+    return get_errno(pdkill(arg1, target_to_host_signal(arg2)));
+}
+
+#endif /* FREEBSD_OS_SIGNAL_H */

-- 
2.55.0