X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:content-type :content-transfer-encoding:mime-version; q=dns; s=default; b=lsy WQ/YqsjdWt016DBdmW3b+wP7Va4NAowfjG9P/4QD3fOJv69Goqs0fnLeY8Oifuln 1Z+MjXY43EGrdbWcuqYJJmSkNEiwop/1QecdryLlNCkz4e+MXhODVn7m/UVvKiAU /VcZtUWJ+4uBoVEDfmHRqLMunMidcINjczsJpZSo= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:content-type :content-transfer-encoding:mime-version; s=default; bh=v1XPJToSR +JNEgbvh3Jf0wAdjFI=; b=cOKDClXYRVVyDKvPcAQxv3XmLt4WSXtPMKyK/1EWz 9W2vzq3x2qndIgTVt5lFymLhjq4JjpM7eZr5/yHpfF6ZfNTUahjvw3lmk5K2XQkJ +4R2KUi7XZpppEEefG9lE4c4aYGCwHZ3mU9YINGDxMmUVV2ZMsx3SDwlpUnRcfH0 J8= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-0.8 required=5.0 tests=AWL,BAYES_99,BAYES_999,MIME_BASE64_BLANKS,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=no version=3.3.2 spammy=Lucky, collins, ss, MUST X-HELO: emea01-db3-obe.outbound.protection.outlook.com From: =?utf-8?B?U3RhbmlzxYJhdyBXYXdzemN6YWs=?= To: "cygwin AT cygwin DOT com" Subject: Cygwin IPC - ftok() returns negative values - Bug Report Date: Wed, 29 Jun 2016 13:14:18 +0000 Message-ID: authentication-results: spf=none (sender IP is ) smtp.mailfrom=stanislaw DOT wawszczak AT iscg DOT pl; x-ms-office365-filtering-correlation-id: fdcee1c2-5043-4ad2-6fac-08d3a01f4738 x-microsoft-exchange-diagnostics: 1;AM3PR05MB337;6:lINzozYyKpvBrC4nIsVv/HVN2n0x/I4pmwRVUusK9kuDZNHyQBhUXcPu3/WUmqT5IzDODVI6i7a/dnqa4HuOtd7PWIwTOzwVSzbtu9s9TEu2XadXhO/V1+S0yH61Lv8shJl3RMQ3Z+XsHVDzL6nGZ1PV6Bdp2W4tZ9umEc+dO47TCr47etPRiAHOnqff0Fbk+VtkcW9Gj0q9fzxxYBfjMLNoAO36WhWb+X8b8DP4Vjt6hyfIdBRbrV07km85/UYE+YKTM6Ys7js6yhHUX8NVMzFz25YVF1G8pXIKG1mGOIzpSt8dM68H2wy/BqX/aZqoP1N0m2AcM7iL0MY6YijSaw==;5:tYJfJyS/SK/SqbkC6ct/ZZypXBwBuCBQ42xocwOGMBSNgtTpArNALmz3rheWlN4iOz4YRnqskr3BRgY8dI1vIScpEmDkR8pjNhwAUotMbCucWH+o2SGl5kU+IpW8vaWpBAMTmRq+ewHbQA+5qVmQ4A==;24:VU5xk/F+UxptRCDNCI6UZM3UrkARvPZiXLMlHYR1NUeW0t2NmdaE53ouizIQmaqKfV92KAkSeYqKQqRFD7G98/VmQyuoS4V+jE2nxN8FWOk=;7:ZrlvIPK/oHBPKrztrVJbgNruARvp2Ssz2HrycfCMqKtwf6V5P9ZoVXMLMKAVPIG7rcbIGuJVmmUKbKw1zB3cwWqlNIGmXusjBkUlFFiIG6lDGcMJ7fR7ujbWVfW2SNJD42uInaGW7rb4nedPYpcu0pVGjMBozh/Q3mz+4V23BjrPGKm6xOYD9aOsTmF2idoR19slIsdeHjP3Nchwml0GAAazJrRkPSMJjiD7IAqZZA17hzI+Ctyo70TAPNbTKKV9kWn9JO1zhUAEMwwlY7ANIQ== x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:AM3PR05MB337; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(194151415913766); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(6040130)(601004)(2401047)(5005006)(8121501046)(10201501046)(3002001)(6041072)(6043046);SRVR:AM3PR05MB337;BCL:0;PCL:0;RULEID:;SRVR:AM3PR05MB337; x-forefront-prvs: 09888BC01D x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(7916002)(189002)(199003)(54356999)(74482002)(5002640100001)(586003)(5003600100003)(305945005)(8676002)(7846002)(7736002)(87936001)(11100500001)(50986999)(66066001)(8936002)(1730700003)(68736007)(81156014)(76576001)(3846002)(7696003)(81166006)(102836003)(19580395003)(189998001)(6116002)(3660700001)(2906002)(3280700002)(86362001)(107886002)(89622001)(106356001)(74316001)(101416001)(85202003)(2900100001)(97736004)(5640700001)(9686002)(575784001)(19580405001)(33656002)(2501003)(5890100001)(85182001)(2351001)(5250100002)(92566002)(110136002)(229853001)(105586002)(450100001)(569005);DIR:OUT;SFP:1102;SCL:1;SRVR:AM3PR05MB337;H:AM3PR05MB339.eurprd05.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;MX:1;A:1;LANG:en; received-spf: None (protection.outlook.com: iscg.pl does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-OriginatorOrg: iscg.pl X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Jun 2016 13:14:18.6311 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d91e211-393e-4cc2-bc59-c077247cadc0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM3PR05MB337 X-IsSubscribed: yes Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by delorie.com id u5TDEv89022619 Dear All, I have had to compile sblim-sfcbd-1.4.10 on Cygwin. It is using IPC semaphores. Unfortunately it is returning wrong value as the result of complicated bit-wise logical operations. I have tried to “hack the system” and make multiplication of returned value by -1, but it triggers error in semget() Environment: Windows 2012 R2 with latest patches I have installed Cygwin from official installer couple days ago. I have attached the gdb session from such invocation. You can see the path and id in arguments are correct and stat() function returns correct values. Finally result in %rax is negative: rax 0xaf0b000701cc1d53 -5833568862233420461 Best Regards, Stanislaw Wawszczak Iscg Poland ############################################################### # GDB session ############################################################### Breakpoint 1, ftok (path=0x4b11f1912 "/usr/local/sbin/sfcbd.exe", id=83) at /usr/src/debug/cygwin-2.5.2-1/winsup/cygwin/ipc.cc:18 18 { (gdb) x/5i 0x4b1201438 : (bad) 0x4b1201439 : add %al,(%rax) 0x4b120143b : add %al,(%rdi) 0x4b120143d : add %al,(%rax) 0x4b120143f : add %al,(%rbx) (gdb) x/5i 0x4b1201441 : add %al,(%rax) 0x4b1201443 : add %al,0x0(%rip) # 0x4b1201449 0x4b1201449 : add %al,(%rax) 0x4b120144b : add %al,(%rax) 0x4b120144d : add %al,(%rax) (gdb) x/5i $pc => 0x1800c6e50 : push %rbx 0x1800c6e51 : sub $0xa0,%rsp 0x1800c6e58 : mov %edx,%ebx 0x1800c6e5a : lea 0x20(%rsp),%rdx 0x1800c6e5f : callq 0x180144970 (gdb) x/5i 0x1800c6e64 : test %eax,%eax 0x1800c6e66 : jne 0x1800c6ec0 0x1800c6e68 : mov 0x20(%rsp),%edx 0x1800c6e6c : mov 0x28(%rsp),%r8 0x1800c6e71 : mov %edx,%eax (gdb) x/5i 0x1800c6e73 : movzbl %dl,%edx 0x1800c6e76 : and $0xff0000,%eax 0x1800c6e7b : shl $0x30,%rdx 0x1800c6e7f : shl $0x28,%rax 0x1800c6e83 : or %rdx,%rax (gdb) x/5i 0x1800c6e86 : movabs $0xffffc00000000000,%rdx 0x1800c6e90 : and %r8,%rdx 0x1800c6e93 : and $0x3fffff,%r8d 0x1800c6e9a : shr $0x10,%rdx 0x1800c6e9e : shl $0x8,%r8 (gdb) x/5i 0x1800c6ea2 : or %rdx,%rax 0x1800c6ea5 : mov %rax,%rcx 0x1800c6ea8 : movzbl %bl,%eax 0x1800c6eab : or %r8,%rax 0x1800c6eae : or %rcx,%rax (gdb) x/5i 0x1800c6eb1 : add $0xa0,%rsp 0x1800c6eb8 : pop %rbx 0x1800c6eb9 : retq 0x1800c6eba : nopw 0x0(%rax,%rax,1) 0x1800c6ec0 : mov $0xffffffffffffffff,%rax (gdb) x/5i 0x1800c6ec7 : jmp 0x1800c6eb1 0x1800c6ec9 : nop 0x1800c6eca : nop 0x1800c6ecb : nop 0x1800c6ecc : nop (gdb) ni 0x00000001800c6e51 18 { (gdb) ni 18 { (gdb) ni 21 if (stat64 (path, &statbuf)) (gdb) x/5i $pc => 0x1800c6e5a : lea 0x20(%rsp),%rdx 0x1800c6e5f : callq 0x180144970 0x1800c6e64 : test %eax,%eax 0x1800c6e66 : jne 0x1800c6ec0 0x1800c6e68 : mov 0x20(%rsp),%edx (gdb) ni 0x00000001800c6e5f 21 if (stat64 (path, &statbuf)) (gdb) x/5i $pc => 0x1800c6e5f : callq 0x180144970 0x1800c6e64 : test %eax,%eax 0x1800c6e66 : jne 0x1800c6ec0 0x1800c6e68 : mov 0x20(%rsp),%edx 0x1800c6e6c : mov 0x28(%rsp),%r8 (gdb) ni 0x00000001800c6e64 21 if (stat64 (path, &statbuf)) (gdb) x/5i $pc => 0x1800c6e64 : test %eax,%eax 0x1800c6e66 : jne 0x1800c6ec0 0x1800c6e68 : mov 0x20(%rsp),%edx 0x1800c6e6c : mov 0x28(%rsp),%r8 0x1800c6e71 : mov %edx,%eax (gdb) r %eax The program being debugged has been started already. Start it from the beginning? (y or n) n Program not restarted. (gdb) info registers rax 0x0 0 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x0 0 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0xffffc768 4294952808 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e64 0x1800c6e64 eflags 0x202 [ IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6e66 21 if (stat64 (path, &statbuf)) (gdb) r %eax The program being debugged has been started already. Start it from the beginning? (y or n) n Program not restarted. (gdb) x/5i $pc => 0x1800c6e66 : jne 0x1800c6ec0 0x1800c6e68 : mov 0x20(%rsp),%edx 0x1800c6e6c : mov 0x28(%rsp),%r8 0x1800c6e71 : mov %edx,%eax 0x1800c6e73 : movzbl %dl,%edx (gdb) ni 78 tmp = (((key_t) statbuf.st_dev) & 0x0000000000ff0000LL) << 40; (gdb) print 0x20(%rsp A syntax error in expression, near `%rsp'. (gdb) print 0x20(%rsp) A syntax error in expression, near `%rsp)'. (gdb) ni 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e6c : mov 0x28(%rsp),%r8 0x1800c6e71 : mov %edx,%eax 0x1800c6e73 : movzbl %dl,%edx 0x1800c6e76 : and $0xff0000,%eax 0x1800c6e7b : shl $0x30,%rdx (gdb) info registers rax 0x0 0 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x7eafb40b 2125444107 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0xffffc768 4294952808 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e6c 0x1800c6e6c eflags 0x246 [ PF ZF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 78 tmp = (((key_t) statbuf.st_dev) & 0x0000000000ff0000LL) << 40; (gdb) x/5i $pc => 0x1800c6e71 : mov %edx,%eax 0x1800c6e73 : movzbl %dl,%edx 0x1800c6e76 : and $0xff0000,%eax 0x1800c6e7b : shl $0x30,%rdx 0x1800c6e7f : shl $0x28,%rax (gdb) ni 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e73 : movzbl %dl,%edx 0x1800c6e76 : and $0xff0000,%eax 0x1800c6e7b : shl $0x30,%rdx 0x1800c6e7f : shl $0x28,%rax 0x1800c6e83 : or %rdx,%rax (gdb) info registers rax 0x7eafb40b 2125444107 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x7eafb40b 2125444107 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e73 0x1800c6e73 eflags 0x246 [ PF ZF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 78 tmp = (((key_t) statbuf.st_dev) & 0x0000000000ff0000LL) << 40; (gdb) info registers rax 0x7eafb40b 2125444107 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xb 11 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e76 0x1800c6e76 eflags 0x246 [ PF ZF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) x/5i $pc => 0x1800c6e76 : and $0xff0000,%eax 0x1800c6e7b : shl $0x30,%rdx 0x1800c6e7f : shl $0x28,%rax 0x1800c6e83 : or %rdx,%rax 0x1800c6e86 : movabs $0xffffc00000000000,%rdx (gdb) ni; x/5i $pc; info registers Invalid character ';' in expression. (gdb) ni 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e7b : shl $0x30,%rdx 0x1800c6e7f : shl $0x28,%rax 0x1800c6e83 : or %rdx,%rax 0x1800c6e86 : movabs $0xffffc00000000000,%rdx 0x1800c6e90 : and %r8,%rdx (gdb) info registers rax 0xaf0000 11468800 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xb 11 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e7b 0x1800c6e7b eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 78 tmp = (((key_t) statbuf.st_dev) & 0x0000000000ff0000LL) << 40; (gdb) info registers rax 0xaf0000 11468800 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xb000000000000 3096224743817216 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e7f 0x1800c6e7f eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) x/5i $pc => 0x1800c6e7f : shl $0x28,%rax 0x1800c6e83 : or %rdx,%rax 0x1800c6e86 : movabs $0xffffc00000000000,%rdx 0x1800c6e90 : and %r8,%rdx 0x1800c6e93 : and $0x3fffff,%r8d (gdb) ni 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e83 : or %rdx,%rax 0x1800c6e86 : movabs $0xffffc00000000000,%rdx 0x1800c6e90 : and %r8,%rdx 0x1800c6e93 : and $0x3fffff,%r8d 0x1800c6e9a : shr $0x10,%rdx (gdb) info registers rax 0xaf00000000000000 -5836665117072162816 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xb000000000000 3096224743817216 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e83 0x1800c6e83 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6e86 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e86 : movabs $0xffffc00000000000,%rdx 0x1800c6e90 : and %r8,%rdx 0x1800c6e93 : and $0x3fffff,%r8d 0x1800c6e9a : shr $0x10,%rdx 0x1800c6e9e : shl $0x8,%r8 (gdb) info registers rax 0xaf0b000000000000 -5833568892328345600 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xb000000000000 3096224743817216 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e86 0x1800c6e86 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6e90 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) info registers rax 0xaf0b000000000000 -5833568892328345600 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0xffffc00000000000 -70368744177664 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e90 0x1800c6e90 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6e93 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6e93 : and $0x3fffff,%r8d 0x1800c6e9a : shr $0x10,%rdx 0x1800c6e9e : shl $0x8,%r8 0x1800c6ea2 : or %rdx,%rax 0x1800c6ea5 : mov %rax,%rcx (gdb) info registers rax 0xaf0b000000000000 -5833568892328345600 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x7000000000000 1970324836974592 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x700000001cc1d 1970324837092381 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e93 0x1800c6e93 eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6e9a 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) ni 0x00000001800c6e9e 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) info registers rax 0xaf0b000000000000 -5833568892328345600 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d 117789 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6e9e 0x1800c6e9e eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6ea2 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) ni 0x00000001800c6ea5 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) info registers rax 0xaf0b000700000000 -5833568862263574528 rbx 0x53 83 rcx 0x7ffa7b5dac7a 140713788288122 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6ea5 0x1800c6ea5 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) x/5i $pc => 0x1800c6ea5 : mov %rax,%rcx 0x1800c6ea8 : movzbl %bl,%eax 0x1800c6eab : or %r8,%rax 0x1800c6eae : or %rcx,%rax 0x1800c6eb1 : add $0xa0,%rsp (gdb) ni 0x00000001800c6ea8 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) x/5i $pc => 0x1800c6ea8 : movzbl %bl,%eax 0x1800c6eab : or %r8,%rax 0x1800c6eae : or %rcx,%rax 0x1800c6eb1 : add $0xa0,%rsp 0x1800c6eb8 : pop %rbx (gdb) info registers rax 0xaf0b000700000000 -5833568862263574528 rbx 0x53 83 rcx 0xaf0b000700000000 -5833568862263574528 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6ea8 0x1800c6ea8 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6eab 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) info registers rax 0x53 83 rbx 0x53 83 rcx 0xaf0b000700000000 -5833568862263574528 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6eab 0x1800c6eab eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6eae 83 tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; (gdb) info registers rax 0x1cc1d53 30154067 rbx 0x53 83 rcx 0xaf0b000700000000 -5833568862263574528 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6eae 0x1800c6eae eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) x/5i $pc => 0x1800c6eae : or %rcx,%rax 0x1800c6eb1 : add $0xa0,%rsp 0x1800c6eb8 : pop %rbx 0x1800c6eb9 : retq 0x1800c6eba : nopw 0x0(%rax,%rax,1) (gdb) info registers rax 0x1cc1d53 30154067 rbx 0x53 83 rcx 0xaf0b000700000000 -5833568862263574528 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6eae 0x1800c6eae eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 89 } (gdb) info registers rax 0xaf0b000701cc1d53 -5833568862233420461 rbx 0x53 83 rcx 0xaf0b000700000000 -5833568862263574528 rdx 0x700000000 30064771072 rsi 0x4 4 rdi 0x10040596e 4299184494 rbp 0x4b1201464 0x4b1201464 rsp 0xffffc930 0xffffc930 r8 0x1cc1d00 30153984 r9 0x4b1201464 20151538788 r10 0x0 0 r11 0x203 515 r12 0x4b11ef0c0 20151464128 r13 0x20 32 r14 0x0 0 r15 0x5 5 rip 0x1800c6eb1 0x1800c6eb1 eflags 0x286 [ PF SF IF ] cs 0x33 51 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x53 83 gs 0x2b 43 (gdb) ni 0x00000001800c6eb8 89 } (gdb) x/5i $pc => 0x1800c6eb8 : pop %rbx 0x1800c6eb9 : retq 0x1800c6eba : nopw 0x0(%rax,%rax,1) 0x1800c6ec0 : mov $0xffffffffffffffff,%rax 0x1800c6ec7 : jmp 0x1800c6eb1 (gdb) ni 0x00000001800c6eb9 89 } (gdb) n ############################################################## # ftok() C source from debugger ############################################################## /* ipc.cc: Single unix specification IPC interface for Cygwin Originally written by Robert Collins Updated to 64 bit key_t by Charles Wilson This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include /* Notes: we return a valid key even if id's low order 8 bits are 0. */ extern "C" key_t ftok (const char *path, int id) { struct stat statbuf; key_t tmp; if (stat64 (path, &statbuf)) { /* stat set the appropriate errno for us */ return (key_t) -1; } /* Since Cygwin 1.5 dev_t is 32bits for cygwin ino_t is 64bits for cygwin and we need 8 bits for the id. thus key_t needs 104 bits total -- but we only have 64 (long long) We will have to alias; leaving open the possibility that the same key will be returned for multiple files. This possibility exists also on Linux; the question is, how to minimize this possibility. How to solve? Well, based on C. Vinschen's research, the nFileIndex* words vary as follows, on a partition with > 110,000 files nFileIndexHigh: 564 values between 0x00010000 -- 0xffff0000 nFileIndexLow : 103812 values between 0x00000000 -- 0x0003ffff R. Collins suggests that these may represent a tree path, and that it would require ~2.9M files to force the tree depth to increase and reveal more bit usage. Implementation details: dev_t is 32bits, but is formed by device(32bits) << 16 | unit(32bits) But device is ACTUALLY == status & FH_DEVMASK, where FH_DEVMASK is 0x00000fff --> 12 bits As it happens, the maximum number of devices is actually FH_NDEV, not FH_DEVMASK, where FH_NDEV is currently 0x0000001d. However, FH_NDEV grows as new device types are added. So currently the device number needs 5 bits, but later? Let's take a cue from Linux, and use the lower 8 bits (instead of the lower 12 or 16) for the device (major?) number. Similarly, while 'units' is an int (32bits), it is unclear how many of these are significant. For most devices, it seems that 'units' is equivalent to 'minor'. For FH_TAPE, it's obvious that only 8 bits are important. However, for FH_SOCKET...it might be as high as 16 significant bits. Let's assume that we only need 8 bits from device (major) and only 8 bits from unit (minor). (On linux, only 8 bits of minor are used, and none from major). ---> so, we only need 0x00ff00ff (16 bits) of dev_t ---> we MUST have all 8 bits of id. ---> So, we only have 64 - 8 - 16 = 40 bits for ino_t. But, we need 0xffff0000 for nFileIndexHigh and 0x0003ffff for nFileIndexLow minimum, or 16 + 18 = 34 bits. Lucky us - we have 6 more bits to distribute. For lack of a better idea, we'll allocate 2 of the extra bits to nFileIndexHigh and 4 to nFileIndexLow. */ /* get 8 bits from dev_t (major), put into 0xff00000000000000L */ tmp = (((key_t) statbuf.st_dev) & 0x0000000000ff0000LL) << 40; /* get 8 bits from dev_t (minor), put into 0x00ff000000000000L */ tmp |= (((key_t) statbuf.st_dev) & 0x00000000000000ffLL) << 48; /* get upper 16+2 bits from nFileInfoHigh, put into 0x0000ffffc0000000L shift down first, then mask, to avoid sign extension on rightshift */ tmp |= (((key_t) statbuf.st_ino) & 0xffffc00000000000LL) >> 16; /* get lower 18+4 bits from nFileInfoLow, put into 0x000000003fffff00L */ tmp |= (((key_t) statbuf.st_ino) & 0x00000000003fffffLL) << 8; /* use all 8 bits of id, and put into 0x00000000000000ffL */ tmp |= (id & 0x00ff); return tmp; }