Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_shmem.h @ 8333:8cc5b0365ee5
Improved maximum errno detection.
Previously, systems without sys_nerr (or _sys_nerr) were handled with an
assumption that errors start at 0 and continuous. This is, however, not
something POSIX requires, and not true on some platforms.
Notably, on Linux, where sys_nerr is no longer available for newly linked
binaries starting with glibc 2.32, there are gaps in error list, which
used to stop us from properly detecting maximum errno. Further, on
GNU/Hurd errors start at 0x40000001.
With this change, maximum errno detection is moved to the runtime code,
now able to ignore gaps, and also detects the first error if needed.
This fixes observed "Unknown error" messages as seen on Linux with
glibc 2.32 and on GNU/Hurd.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 01 Mar 2021 20:00:43 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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696 | 8 #ifndef _NGX_SHMEM_H_INCLUDED_ |
9 #define _NGX_SHMEM_H_INCLUDED_ | |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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605 | 16 typedef struct { |
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17 u_char *addr; |
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18 size_t size; |
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19 ngx_str_t name; |
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20 ngx_log_t *log; |
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21 ngx_uint_t exists; /* unsigned exists:1; */ |
605 | 22 } ngx_shm_t; |
23 | |
24 | |
25 ngx_int_t ngx_shm_alloc(ngx_shm_t *shm); | |
26 void ngx_shm_free(ngx_shm_t *shm); | |
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28 |
696 | 29 #endif /* _NGX_SHMEM_H_INCLUDED_ */ |