From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7814) id 9B729395200D; Mon, 16 Aug 2021 17:14:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9B729395200D Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Fangrui Song To: glibc-cvs@sourceware.org Subject: [glibc/maskray/lld] hurd mmap: Factorize MAP_SHARED flag check X-Act-Checkin: glibc X-Git-Author: Sergey Bugaev X-Git-Refname: refs/heads/maskray/lld X-Git-Oldrev: 43d06ed218fc8be58987bdfd00e21e5720f0b862 X-Git-Newrev: 08fc6df294ab7e10e14492094a99b7861ad7d77e Message-Id: <20210816171449.9B729395200D@sourceware.org> Date: Mon, 16 Aug 2021 17:14:49 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Aug 2021 17:14:49 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=08fc6df294ab7e10e14492094a99b7861ad7d77e commit 08fc6df294ab7e10e14492094a99b7861ad7d77e Author: Sergey Bugaev Date: Wed Aug 11 18:31:51 2021 +0200 hurd mmap: Factorize MAP_SHARED flag check Reviewed-by: Samuel Thibault Diff: --- sysdeps/mach/hurd/mmap.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/sysdeps/mach/hurd/mmap.c b/sysdeps/mach/hurd/mmap.c index ea0e61d571..9fa265f752 100644 --- a/sysdeps/mach/hurd/mmap.c +++ b/sysdeps/mach/hurd/mmap.c @@ -37,6 +37,7 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) vm_prot_t vmprot; memory_object_t memobj; vm_address_t mapaddr; + boolean_t copy; mapaddr = (vm_address_t) addr; @@ -52,6 +53,8 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) if (prot & PROT_EXEC) vmprot |= VM_PROT_EXECUTE; + copy = ! (flags & MAP_SHARED); + switch (flags & MAP_TYPE) { default: @@ -98,7 +101,7 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) __mach_port_deallocate (__mach_task_self (), memobj); } else if (wobj == MACH_PORT_NULL /* Not writable by mapping. */ - && !(flags & MAP_SHARED)) + && copy) /* The file can only be mapped for reading. Since we are making a private mapping, we will never try to write the object anyway, so we don't care. */ @@ -123,9 +126,8 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) &mapaddr, (vm_size_t) len, (vm_address_t) 0, mapaddr == 0, memobj, (vm_offset_t) offset, - ! (flags & MAP_SHARED), - vmprot, VM_PROT_ALL, - (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY); + copy, vmprot, VM_PROT_ALL, + copy ? VM_INHERIT_COPY : VM_INHERIT_SHARE); if (flags & MAP_FIXED) { @@ -138,10 +140,8 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) err = __vm_map (__mach_task_self (), &mapaddr, (vm_size_t) len, (vm_address_t) 0, 0, memobj, (vm_offset_t) offset, - ! (flags & MAP_SHARED), - vmprot, VM_PROT_ALL, - (flags & MAP_SHARED) ? VM_INHERIT_SHARE - : VM_INHERIT_COPY); + copy, vmprot, VM_PROT_ALL, + copy ? VM_INHERIT_COPY : VM_INHERIT_SHARE); } } else @@ -150,10 +150,8 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) err = __vm_map (__mach_task_self (), &mapaddr, (vm_size_t) len, (vm_address_t) 0, 1, memobj, (vm_offset_t) offset, - ! (flags & MAP_SHARED), - vmprot, VM_PROT_ALL, - (flags & MAP_SHARED) ? VM_INHERIT_SHARE - : VM_INHERIT_COPY); + copy, vmprot, VM_PROT_ALL, + copy ? VM_INHERIT_COPY : VM_INHERIT_SHARE); } if (memobj != MACH_PORT_NULL)