Mercurial > hg > nginx
annotate src/os/unix/ngx_sunpro_x86.il @ 5356:acd51b0f6fd4
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 | 2cd019520210 |
rev | line source |
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561 | 1 / |
2 / Copyright (C) Igor Sysoev | |
4412 | 3 / Copyright (C) Nginx, Inc. |
561 | 4 / |
5 | |
6 / ngx_atomic_uint_t ngx_atomic_cmp_set(ngx_atomic_t *lock, | |
7 / ngx_atomic_uint_t old, ngx_atomic_uint_t set); | |
8 / | |
2818
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
9 / the arguments are passed on stack (%esp), 4(%esp), 8(%esp) |
561 | 10 |
11 .inline ngx_atomic_cmp_set,0 | |
12 movl (%esp), %ecx | |
13 movl 4(%esp), %eax | |
14 movl 8(%esp), %edx | |
15 lock | |
16 cmpxchgl %edx, (%ecx) | |
17 setz %al | |
18 movzbl %al, %eax | |
19 .end | |
20 | |
21 | |
22 / ngx_atomic_int_t ngx_atomic_fetch_add(ngx_atomic_t *value, | |
23 / ngx_atomic_int_t add); | |
24 / | |
2818
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
25 / the arguments are passed on stack (%esp), 4(%esp) |
561 | 26 |
27 .inline ngx_atomic_fetch_add,0 | |
28 movl (%esp), %ecx | |
29 movl 4(%esp), %eax | |
30 lock | |
31 xaddl %eax, (%ecx) | |
32 .end | |
1309 | 33 |
34 | |
35 / ngx_cpu_pause() | |
2818
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
36 / |
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
37 / the "rep; nop" is used instead of "pause" to avoid the "[ PAUSE ]" hardware |
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
38 / capability added by linker because Solaris/i386 does not know about it: |
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
39 / |
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
40 / ld.so.1: nginx: fatal: hardware capability unsupported: 0x2000 [ PAUSE ] |
1309 | 41 |
42 .inline ngx_cpu_pause,0 | |
2818
7e02df612521
preserve Solaris binary hardware capabilities
Igor Sysoev <igor@sysoev.ru>
parents:
1309
diff
changeset
|
43 rep; nop |
1309 | 44 .end |