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Thu, 05 Feb 2026 09:27:00 -0800 (PST) From: Warner Losh Date: Thu, 05 Feb 2026 10:26:51 -0700 Subject: [PATCH 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: <20260205-bsd-user-claude-v1-18-8d8ff0035372@bsdimp.com> References: <20260205-bsd-user-claude-v1-0-8d8ff0035372@bsdimp.com> In-Reply-To: <20260205-bsd-user-claude-v1-0-8d8ff0035372@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=3865; i=imp@bsdimp.com; h=from:subject:message-id; bh=HUPyJDxIUhLpC347cYUoD0NCrlqyR8thYmZfxprwEXo=; b=owEBbQKS/ZANAwAKAWwc0Sh9sBEAAcsmYgBphNLbp20o7Qfo/cFNCPpWjkizHKCS6t4i7HCDv 8SqQh6RbQ6JAjMEAAEKAB0WIQQgNfiUsAqjz3zN4bdsHNEofbARAAUCaYTS2wAKCRBsHNEofbAR ANOiEACXKMv9jUv/HK30b8IzNgpeHHr2Suu5q7AVs7nOna3LWrBRQ2ypP1YG8W1eV+AVv5XxZwX VU5poAlkOa3I0ht24de4AawzzTuxHpGjjvcCs1z1HTyzcG9diq3q91bCqFAcWhSfzKdx8ju6WuY i+GcD6RzMTnYKpirQpDLBbrWgjptUUYrO8Zmo+VB7amjMP4TRt5Hd0EkbbZm2BKKNjH8sjn1/rm vXr+mE1TlQ/7F2IBgICpyLumwW0dfsRKo643Z58f8Wz7bpZPsuL0SeRaVoU0w0fJ+Tj2xBvgZmZ 47jyGebHRv02RskcDu0pRyhF7zZzFWF5oOJoXtFJlrVsSKcUFX3c+WdHXpL6qR9TlsPMAp6jxf/ ZnbFLqg1bOWE5ixS3m3HTwH6uKJYrVadMD0xngx23/xR9ALpynz5mGQhBrvwtZvb0qt8kcRFMc6 ivaU/Z4SiKZaORIRo5ojYR6+PuDFuPyv/9ZRchspQEu+Yzx6VCKeNLznZW1fgAnoNXlxsxLEZdQ aVU7CC2q1Mggo8aWff50dJt87fYNFiYOCXlltx0CRTausYuuMsKlMG5bFHdSHIiG46Mq1MXMQk6 sFQcGDx6mHp16c8wa/MZlGiSFbMbqVZh9Ka3ujylYIBD49zhcuT6pHeqneGhDIOkTqfTrX2K+FN kylWiuk/HxWTJwA== 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=2001:4860:4864:20::30; envelope-from=imp@bsdimp.com; helo=mail-oa1-x30.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: 1770312614345158502 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 | 117 ++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 117 insertions(+) diff --git a/bsd-user/bsd-misc.h b/bsd-user/bsd-misc.h index 1aa1549fd2..81fdfd8351 100644 --- a/bsd-user/bsd-misc.h +++ b/bsd-user/bsd-misc.h @@ -111,6 +111,123 @@ 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, + union target_semun target_su) +{ + union semun arg; + struct semid_ds dsarg; + unsigned short *array =3D NULL; + int host_cmd; + abi_long ret =3D 0; + abi_long err; + + 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; + } + + switch (host_cmd) { + case GETVAL: + case SETVAL: + /* + * In 64 bit cross-endian situations, we will erroneously pick up = the + * wrong half of the union for the "val" element. To rectify this= , the + * entire 8-byte structure is byteswapped, followed by a swap of t= he 4 + * byte val field. In other cases, the data is already in proper h= ost + * byte order. + */ + if (sizeof(target_su.val) !=3D (sizeof(target_su.buf))) { + target_su.buf =3D tswapal(target_su.buf); + arg.val =3D tswap32(target_su.val); + } else { + arg.val =3D target_su.val; + } + ret =3D get_errno(semctl(semid, semnum, host_cmd, arg)); + break; + + case GETALL: + case SETALL: + err =3D target_to_host_semarray(semid, &array, target_su.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_su.array, &array); + if (is_error(err)) { + return err; + } + break; + + case IPC_STAT: + case IPC_SET: + err =3D target_to_host_semid_ds(&dsarg, target_su.buf); + 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_su.buf, &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