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annotate src/os/unix/ngx_sunpro_sparc64.il @ 5356:acd51b0f6fd4

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Disable symlinks: use O_PATH to open path components. It was introduced in Linux 2.6.39, glibc 2.14 and allows to obtain file descriptors without actually opening files. Thus made it possible to traverse path with openat() syscalls without the need to have read permissions for path components. It is effectively emulates O_SEARCH which is missing on Linux. O_PATH is used in combination with O_RDONLY. The last one is ignored if O_PATH is used, but it allows nginx to not fail when it was built on modern system (i.e. glibc 2.14+) and run with a kernel older than 2.6.39. Then O_PATH is unknown to the kernel and ignored, while O_RDONLY is used. Sadly, fstat() is not working with O_PATH descriptors till Linux 3.6. As a workaround we fallback to fstatat() with the AT_EMPTY_PATH flag that was introduced at the same time as O_PATH.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 02 Sep 2013 08:07:59 +0400
parents d620f497c50f
children
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e48ebafc6939 nginx-0.3.2-RELEASE import
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1 /
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2 / Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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3 / Copyright (C) Nginx, Inc.
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7 / "casa [%o2] 0x80, %o1, %o0" and
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8 / "casxa [%o2] 0x80, %o1, %o0" do the following:
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10 / if ([%o2] == %o1) {
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11 / swap(%o0, [%o2]);
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12 / } else {
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13 / %o0 = [%o2];
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14 / }
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17 / ngx_atomic_uint_t ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
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18 / ngx_atomic_t *lock);
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19 /
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20 / the arguments are passed in the %o0, %o1, %o2
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21 / the result is returned in the %o0
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23 .inline ngx_casa,0
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24 casa [%o2] 0x80, %o1, %o0
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25 .end
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28 / ngx_atomic_uint_t ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
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29 / ngx_atomic_t *lock);
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30 /
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31 / the arguments are passed in the %o0, %o1, %o2
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32 / the result is returned in the %o0
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34 .inline ngx_casxa,0
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35 casxa [%o2] 0x80, %o1, %o0
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36 .end