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([203.56.128.103]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7106ed16cb3sm4576038b3a.179.2024.08.04.17.31.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 04 Aug 2024 17:31:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1722817907; x=1723422707; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=V6ZlS+VMsFpi/JD9xfA3NQaSnzna6YC/nJ4q2H/FlJk=; b=FL00/yi0BB+1eNCp4Jl2CuQYIMPbINmyP0hYKnOoLPQ4hkKU9bZv7ko3kxEbpSm2iS YUI/WQub3LhHKooFSF1c7M6S1q1Fb+R1Ub5y4o4JY2he+Pe6YcN5iwTpk9H2M7vjGFv2 F1DRtu9hKhEs4cHvfBLQzX2YlZoWLg/KNv7UnmVod3Q/xrfToWyWccpMrSFdbnmtXIKf vNs8ZQzqOXyDQtmwHqZHdUtGUL160mMoXsK8+9PvuVgpeIDm4TpFxTDcWRRq9Hfav126 icbLcS5KEmQiCQGvMzbFMBGfJqY3+GjL/g7VOYKItWFx6fw85LLstrVw6FxbGmzp1jCy 9Bcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722817907; x=1723422707; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=V6ZlS+VMsFpi/JD9xfA3NQaSnzna6YC/nJ4q2H/FlJk=; b=f5UDe403Kj7E6uXdpL1iX5PhOjrt18ks7cHXfYkNSq2XbbDTgnxMS0uKTGsE0wq4vq mBNjMj1hnm/nB3cORemNn4wetD23+rgZ6I8dNrPLK3G0TXvRHLJDLHy3k+XovZPwA2+x Z+/nbxvaqJ4gm2qvrVFsHE0IxpuFoEJc43ZJtixqGtuUgsP2nIT/od28gRGCKf8/WTg9 YdyhlxXS0IW+Gm91yRUBUhak0gI2Y6xohI0miSt3rSrkiJ6hzQK6PgStQTC6B0wux36/ rEqW38imEp91nMBPSP5N1pFQOSXzqB4Di8pjLeRKjyVv9iIvUkgQT0qXJUdu61Dxh4gX ctTA== X-Gm-Message-State: AOJu0YyEjF815SCWC4XbdPNOD1MhRkju5O4FT+nddgU1fD8HzbjDFA3i dLndhVfzoQZWpVPGGU1L9VI4aTjsNCThOg+GCMVTpvunAMtCTbhJxwoO2nFuwCnZZseb62HYKhF GFUuZew== X-Google-Smtp-Source: AGHT+IH6fhoe6GxYqp8faMs8tNpspGeK+SxjbQLgT/5zILlVRNg279qzJemFoQGNWGAWZneOqFdaSg== X-Received: by 2002:a05:6a00:194a:b0:70d:3a5d:5d4a with SMTP id d2e1a72fcca58-7106cfafe51mr9332762b3a.12.1722817906752; Sun, 04 Aug 2024 17:31:46 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= Subject: [PULL 3/6] qemu/osdep: Split qemu_close_all_open_fd() and add fallback Date: Mon, 5 Aug 2024 10:31:26 +1000 Message-ID: <20240805003130.1421051-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240805003130.1421051-1-richard.henderson@linaro.org> References: <20240805003130.1421051-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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: pass client-ip=2607:f8b0:4864:20::42c; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-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: 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 @linaro.org) X-ZM-MESSAGEID: 1722818000554116600 From: Cl=C3=A9ment L=C3=A9ger In order to make it cleaner, split qemu_close_all_open_fd() logic into multiple subfunctions (close with close_range(), with /proc/self/fd and fallback). Signed-off-by: Cl=C3=A9ment L=C3=A9ger Reviewed-by: Richard Henderson Message-ID: <20240802145423.3232974-3-cleger@rivosinc.com> Signed-off-by: Richard Henderson --- util/oslib-posix.c | 50 ++++++++++++++++++++++++++++++++++------------ 1 file changed, 37 insertions(+), 13 deletions(-) diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 1e867efa47..9b79fc7cff 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -808,27 +808,16 @@ int qemu_msync(void *addr, size_t length, int fd) return msync(addr, length, MS_SYNC); } =20 -/* - * Close all open file descriptors. - */ -void qemu_close_all_open_fd(void) +static bool qemu_close_all_open_fd_proc(void) { struct dirent *de; int fd, dfd; DIR *dir; =20 -#ifdef CONFIG_CLOSE_RANGE - int r =3D close_range(0, ~0U, 0); - if (!r) { - /* Success, no need to try other ways. */ - return; - } -#endif - dir =3D opendir("/proc/self/fd"); if (!dir) { /* If /proc is not mounted, there is nothing that can be done. */ - return; + return false; } /* Avoid closing the directory. */ dfd =3D dirfd(dir); @@ -840,4 +829,39 @@ void qemu_close_all_open_fd(void) } } closedir(dir); + + return true; +} + +static bool qemu_close_all_open_fd_close_range(void) +{ +#ifdef CONFIG_CLOSE_RANGE + int r =3D close_range(0, ~0U, 0); + if (!r) { + /* Success, no need to try other ways. */ + return true; + } +#endif + return false; +} + +static void qemu_close_all_open_fd_fallback(void) +{ + int open_max =3D sysconf(_SC_OPEN_MAX), i; + + /* Fallback */ + for (i =3D 0; i < open_max; i++) { + close(i); + } +} + +/* + * Close all open file descriptors. + */ +void qemu_close_all_open_fd(void) +{ + if (!qemu_close_all_open_fd_close_range() && + !qemu_close_all_open_fd_proc()) { + qemu_close_all_open_fd_fallback(); + } } --=20 2.43.0