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Sun, 08 Feb 2026 11:26:49 -0800 (PST) From: Warner Losh Date: Sun, 08 Feb 2026 12:26:27 -0700 Subject: [PATCH v2 18/24] bsd-user: Add do_bsd___semctl implementation MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260208-bsd-user-claude-v2-18-58e5fcfdb84f@bsdimp.com> References: <20260208-bsd-user-claude-v2-0-58e5fcfdb84f@bsdimp.com> In-Reply-To: <20260208-bsd-user-claude-v2-0-58e5fcfdb84f@bsdimp.com> To: qemu-devel@nongnu.org Cc: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Kyle Evans , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Riku Voipio , Warner Losh , Stacey Son X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3708; i=imp@bsdimp.com; h=from:subject:message-id; bh=cfJRTsYvKZD7Yc0/nEDaV9nHPnFLlDrFK+u5REhyA9A=; b=owEBbQKS/ZANAwAKAWwc0Sh9sBEAAcsmYgBpiONh1ytqjerhAF5KTqNaGjVQGpF6LRcY5tgpd sq5XLIA2xyJAjMEAAEKAB0WIQQgNfiUsAqjz3zN4bdsHNEofbARAAUCaYjjYQAKCRBsHNEofbAR AHd6D/9f7T8bj5AjPKh6aqdpq0sr+AqhQJimIe3lq5TzCmrLcePe9V2j2p6MwxpqrpoDDH8ZkHK 9ClwMnvHJjoAssxdBbiS13dYH4gqr7VsZ1euI5VmhR/OyWqJ+aT3PtRMCcDRayTuPIApvmelLzU /hHfgk/ZaG2DkP850zWSMCyAQp7MPJh3OCviWrsZ24kO1EWAX2tr6G4CDZ/ywcl1fMUV2T8r9yu v0Yx9DIGk2KKxUxrCcRHvToJ2EGApwK/yqnYC4tqo3l15G8sGnc04nT4uSOigT479hQlzn+9W0r /k2+j/7EN6xaHf2UdLU9AUnV5kf4xNPLCX+fm9kn5hDn/A7Zvb23TB8gE1nsaUMXJqqMahGAAf1 HUPPMczsBP+Z42hrDfg9FIeBN+FFJunXF4KyHA2WxZzV+pFsVu4G50lxZVHilzYprnIQ6MH9PvZ iH+19igv1b/mI9mwY1YShNOBuxmiL8Ian2npQgYkT/46cD0h9WQMRrM8AsSr3bwU1Wujzkgac6F 4t83pDP4vGKXpiHbmwqTqSZXWnGidc6bAAwjBJwnlZLJszRW82ZYO/cQF8KxfWVdnZASfLz4a1o a/Z1jVV6m3c7ewpm/BtvjAV1t5pmmtsiXKO1h0ChIWPYxtuXpG6uk7zXUpVTCYbPproxkw2HClT uFqlsw8rlSMXnmA== X-Developer-Key: i=imp@bsdimp.com; a=openpgp; fpr=2035F894B00AA3CF7CCDE1B76C1CD1287DB01100 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::c35; envelope-from=imp@bsdimp.com; helo=mail-oo1-xc35.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @bsdimp-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1770578914923154100 From: Stacey Son Add implementation of __semctl(2) syscall for System V semaphore control operations. Handles command translation, endianness conversion for GETVAL/ SETVAL, and array/structure conversions for GETALL/SETALL/IPC_STAT/IPC_SET. Signed-off-by: Stacey Son Signed-off-by: Warner Losh --- bsd-user/bsd-misc.h | 115 ++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 115 insertions(+) diff --git a/bsd-user/bsd-misc.h b/bsd-user/bsd-misc.h index cba0b2ec92..d3ce01a2a3 100644 --- a/bsd-user/bsd-misc.h +++ b/bsd-user/bsd-misc.h @@ -106,6 +106,121 @@ static inline abi_long do_bsd_semop(int semid, abi_lo= ng ptr, unsigned nsops) return semop(semid, sops, nsops); } =20 +/* __semctl(2) */ +static inline abi_long do_bsd___semctl(int semid, int semnum, int target_c= md, + abi_ptr un_ptr) +{ + void *target_un; + union semun arg; + struct semid_ds dsarg; + unsigned short *array =3D NULL; + int host_cmd; + abi_long ret =3D 0; + abi_long err; + abi_ulong target_array, target_buffer; + + switch (target_cmd) { + case TARGET_GETVAL: + host_cmd =3D GETVAL; + break; + + case TARGET_SETVAL: + host_cmd =3D SETVAL; + break; + + case TARGET_GETALL: + host_cmd =3D GETALL; + break; + + case TARGET_SETALL: + host_cmd =3D SETALL; + break; + + case TARGET_IPC_STAT: + host_cmd =3D IPC_STAT; + break; + + case TARGET_IPC_SET: + host_cmd =3D IPC_SET; + break; + + case TARGET_IPC_RMID: + host_cmd =3D IPC_RMID; + break; + + case TARGET_GETPID: + host_cmd =3D GETPID; + break; + + case TARGET_GETNCNT: + host_cmd =3D GETNCNT; + break; + + case TARGET_GETZCNT: + host_cmd =3D GETZCNT; + break; + + default: + return -TARGET_EINVAL; + } + + /* + * Unlike Linux and the semctl system call, we take a pointer + * to the union arg here. + */ + target_un =3D lock_user(VERIFY_READ, un_ptr, sizeof(union target_semun= ), 0); + + switch (host_cmd) { + case GETVAL: + case SETVAL: + __get_user(arg.val, (abi_int *)target_un); + ret =3D get_errno(semctl(semid, semnum, host_cmd, arg)); + break; + + case GETALL: + case SETALL: + __get_user(target_array, (abi_ulong *)target_un); + err =3D target_to_host_semarray(semid, &array, target_array); + if (is_error(err)) { + return err; + } + arg.array =3D array; + ret =3D get_errno(semctl(semid, semnum, host_cmd, arg)); + err =3D host_to_target_semarray(semid, target_array, &array); + if (is_error(err)) { + return err; + } + break; + + case IPC_STAT: + case IPC_SET: + __get_user(target_buffer, (abi_ulong *)target_un); + err =3D target_to_host_semid_ds(&dsarg, target_buffer); + if (is_error(err)) { + return err; + } + arg.buf =3D &dsarg; + ret =3D get_errno(semctl(semid, semnum, host_cmd, arg)); + err =3D host_to_target_semid_ds(target_buffer, &dsarg); + if (is_error(err)) { + return err; + } + break; + + case IPC_RMID: + case GETPID: + case GETNCNT: + case GETZCNT: + ret =3D get_errno(semctl(semid, semnum, host_cmd, NULL)); + break; + + default: + ret =3D -TARGET_EINVAL; + break; + } + return ret; +} + /* getdtablesize(2) */ static inline abi_long do_bsd_getdtablesize(void) { --=20 2.52.0