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b=mP63FDNwsmc2z+MV0yQRVOuYy2pgDaxLVDmWQSiCs3G0Qejocgfd6NZW0NVMqpKHW 24/bsySmpTpONlRZaQ6VOrGGl2Fl9E2d+p473eF2hhGR99t7z8KKRzrrkkRXdc+17N UkNmWpkpoxfwQPU8adGso3Q4My+Ep9j8Cz/5HUWT8Ji5+AfBxPEmTVZAFUTuShJ+gO XzTaXjo6R0MgmeNqQeqGrmsSR4yF05qopXOdpnVcgTU0ZABSSu9UukpOsc+govB178 ML6/N7pSodQ77uOFJX1ky1Yl+3AuLRPdoh1SJFuzTwZ/URSb23J6iNQkvQpRhoGL2a G2Uk6vJ36RdFg== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from limone.obstwiese ([46.223.163.177]) by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1Mkpex-1ojAi71vmp-00mL6y for ; Sat, 11 Feb 2023 10:41:20 +0100 Received: from luthien by limone.obstwiese with local (Exim 4.94.2) (envelope-from ) id 1pQmNX-0002lD-CP; Sat, 11 Feb 2023 10:41:07 +0100 Date: Sat, 11 Feb 2023 10:41:07 +0100 From: Dominik Vogt To: Zsh Users Subject: Frozen command substitution Message-ID: Reply-To: zsh-users@zsh.org Mail-Followup-To: Zsh Users MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Provags-ID: V03:K1:7lwPTTqVHRzyNCMfhs0GVflVGr+q9EsQONLnGdENremBgiY9NvO y1xJhymHtlVSbqhZIqYHI+vayf81XKhI5y2zU5MViNCwdFNWjQVAGFl0TYv2tQ1bCDmSZso vEf/AP58LjNIyiUXLvOIOrS1Xmdvh9K7fht0RNdkyHiY251B6vE9ck2mPEIL3eaqZeANAYD okP6rpMwsTY8U0L/eo8fw== UI-OutboundReport: notjunk:1;M01:P0:f7sIe+CbiHI=;d89H+v5t1oZg4aXZa0LAjROQTDI Y7QqRrWyKbWTAe66db6ouN0HHOy642rmedsCA3IPgoJ382xSboWQj4nVHsdsRv2OtXMGH+gqy WVaPYMatJwWkQRiVFhNfwNF3hxc2Mck52I14znXFGY6ed4RcICcpOgLCVNPpe78VMmYMAKThC gKXI2uJL5RqgUaHd97SeNDnzVFaAKe+V1q0iNcjYXWV3BxxpgDu2Wm2CIEz136Tp1A8/j9jCM cYUxVkayhstpDRt60jNjBSXvKyYGUfMsD+YVZru/iSJGiL3m7fduN4Vf3i7sGOBaH49wOgY1+ r0s0gxy6IHJboZsBRQj1sCqSw2nA3C9NOo0158S8IKVPkvTs1EQZNtLxDJRc8usEvif93SC6p kG4oNp+7PLj3GWzzTZmc5/7cwk7gchYwVK2f21yBqif6nm1SbfiJOCrfPPeA8p2H6vCUWTNfz F10mgITGfFFyv4VFQ756DwoNLxh/uWMcesBARktpPqeuHAdme9N02N8TIWsZSYbSxmtYBiUqj GE/+9SgH76zonQenoSURTTB2Xmuqqkw026XafLjSQJbt70DPw35DwNvMDGn1z9VsuAxdVQI8D Eq8Iai6WH9I8HbAdj0boDMu4KwWZ7ilZIVnP3VXXe/8Ojjq9ihUSA+Sw5+pR0J20JYx8pIp63 hqQwv894gLLQhfFFu432Pza8Usyzg3meZ7idhl6ReLqaAx5e7nXH5N/qOX5uFridPSL54dUQs g6VjsKZ+koW1a/w5g1KWzqBogZQu8LS+SIlvlnhCrXIiacCCNNDbtIgasBwu7RPFOemMPEvgp IvdR54IyphxwpBcVU7rvIFNMk2m515S5IGZFQdIkNlQbbwFAn3TN1nO1nW/mV8Jz43CltCWKZ 9QnCkFHRHSI5dsAiQdv2TiLrJa9CG1rT1lrYbwa7ta4WbscLw9rNgc2A35PwPvdts0aEsbG+o /vSyJQ== Content-Transfer-Encoding: quoted-printable X-Seq: 28912 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: I have two long running scripts that do complex interaction with the web browser, say "foo" which calls the subordinate script "bar". The browser crashes once in a while and is restarted automatically by some other script. Sometimes when this happens, foo freezes in a call of bar and won't wake up anymore when bar terminates: =2D- foo -- while true; do some-func test some-condition && break done some-func () { while true; do R=3D"$(bar ssome arguments)" <------- hangs in this line test some condition && return 0 done } =2D- foo -- =2D- bar -- # some long-running loop # ... return 0 =2D- bar -- Ciao Dominik ^_^ ^_^ =2D- So, foo calls bar in a loop. While bar is running, the browser is restarted. bar detects this, finishes and exits with the "return 0". However, foo does not continue with the line after the command substitution. A "ctrl-z" foollowed by "fg" does not help. Sending it SIGUSR1 (which has a trap installed) wakes it up again. In the process list: $ pstree -a ... -+-zsh-+-foo |-tee +-zsh (The whole stuff is calles with "while true; do foo 2>&1 | tee foo.out; done".) /proc//status says: $ cat /proc//status ... State: S (sleeping) Tgid: 13030 Ngid: 0 Pid: 13030 PPid: 24927 ... foo has a trap for "HUP" installed, and that's being called when when I type "killall -HUP foo", so the shell is not dead. "ps" lists the processes' status as "S+". Dominik Vogt