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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
commit95878586ec7611791f4001a4ee17abf943fae3c1 (patch)
tree847cf658ab3c3208a296202194b16a6550b243cf /open_issues/mmap_write-only.mdwn
parent8063426bf7848411b0ef3626d57be8cb4826715e (diff)
rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn
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@@ -1,57 +0,0 @@
-[[!meta copyright="Copyright © 2011, 2012 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!tag open_issue_glibc open_issue_llvm]]
-
-
-# IRC, freenode, #hurd, 2011-12-14
-
- <pinotree> hm, interesting mmap bug
- <youpi> ?
- <pinotree> youpi: http://paste.debian.net/149252/
- #include <sys/types.h>
- #include <sys/mman.h>
- #include <fcntl.h>
- #include <stdio.h>
- #include <errno.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
-
- void die(int x, const char *s)
- {
- perror(s);
- exit(x);
- }
-
- static const char s_file[] = "foo-mmaptest";
-
- int main()
- {
- int fd;
- void *p;
-
- fd = creat(s_file, 0777);
- if (fd < 0) die(1, "creat");
- errno = 0;
- p = mmap(NULL, 1, PROT_READ, MAP_SHARED, fd, 0);
- printf("> %p vs %p, %d (%s)\n", p, MAP_FAILED, errno, strerror(errno));
- unlink(s_file);
- return (p != MAP_FAILED);
- }
- <pinotree> on linux it returns 0 and fails with EACCESS (as it seems it
- should, by reading the mmap posix docs), on hurd it returns 1 and the
- mmap succeeds
- <pinotree> (taken from llvm's configure)
- <youpi> why should it? file size extension ?
- <pinotree> creat creates a o_wronly file, while the mmap specifies only
- read protection
- <youpi> oh, craet is always wo
- <youpi> I didn't know that