From: Stacey Son <sson@FreeBSD.org>
Date: Mon, 2 Feb 2026 23:44:39 +0000 (-0700)
Subject: bsd-user: Add do_bsd_semop implementation
X-Git-Tag: v11.0.0-rc0~42^2~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=441ddfb820ae30d4a47bb378d7cd830c093a2747;p=thirdparty%2Fqemu.git

bsd-user: Add do_bsd_semop implementation

Add implementation of semop(2) syscall to perform System V semaphore
operations. Converts target sembuf array to host format and executes
operations.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---

diff --git a/bsd-user/bsd-misc.h b/bsd-user/bsd-misc.h
index 3dffb977a54..e1e552b58f5 100644
--- a/bsd-user/bsd-misc.h
+++ b/bsd-user/bsd-misc.h
@@ -77,6 +77,28 @@ static inline abi_long do_bsd_semget(abi_long key, int nsems,
                 target_to_host_bitmask(target_flags, ipc_flags_tbl)));
 }
 
+/* semop(2) */
+static inline abi_long do_bsd_semop(int semid, abi_long ptr, unsigned nsops)
+{
+    g_autofree struct sembuf *sops = g_malloc(nsops * sizeof(struct sembuf));
+    struct target_sembuf *target_sembuf;
+    int i;
+
+    target_sembuf = lock_user(VERIFY_READ, ptr,
+            nsops * sizeof(struct target_sembuf), 1);
+    if (target_sembuf == NULL) {
+        return -TARGET_EFAULT;
+    }
+    for (i = 0; i < nsops; i++) {
+        __get_user(sops[i].sem_num, &target_sembuf[i].sem_num);
+        __get_user(sops[i].sem_op, &target_sembuf[i].sem_op);
+        __get_user(sops[i].sem_flg, &target_sembuf[i].sem_flg);
+    }
+    unlock_user(target_sembuf, ptr, 0);
+
+    return semop(semid, sops, nsops);
+}
+
 /* getdtablesize(2) */
 static inline abi_long do_bsd_getdtablesize(void)
 {