Mercurial > hg > nginx-quic

annotate src/os/unix/ngx_errno.c @ 4448:539355d9e675 stable-1.0

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Merge of r4404: Fixed sched_setaffinity(2) to correctly pass size. Second argument (cpusetsize) is size in bytes, not in bits. Previously used constant 32 resulted in reading of uninitialized memory and caused EINVAL to be returned on some Linux kernels.
author Maxim Dounin <mdounin@mdounin.ru>
date Sun, 05 Feb 2012 19:25:24 +0000
parents d3568507db51
children d620f497c50f
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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11 /*
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12 * The strerror() messages are copied because:
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13 *
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14 * 1) strerror() and strerror_r() functions are not Async-Signal-Safe,
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15 * therefore, they cannot be used in signal handlers;
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16 *
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17 * 2) a direct sys_errlist[] array may be used instead of these functions,
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18 * but Linux linker warns about its usage:
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19 *
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20 * warning: `sys_errlist' is deprecated; use `strerror' or `strerror_r' instead
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21 * warning: `sys_nerr' is deprecated; use `strerror' or `strerror_r' instead
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22 *
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23 * causing false bug reports.
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24 */
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27 static ngx_str_t *ngx_sys_errlist;
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28 static ngx_str_t ngx_unknown_error = ngx_string("Unknown error");
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31 u_char *
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32 ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
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33 {
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34 ngx_str_t *msg;
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35
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36 msg = ((ngx_uint_t) err < NGX_SYS_NERR) ? &ngx_sys_errlist[err]:
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37 &ngx_unknown_error;
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38 size = ngx_min(size, msg->len);
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39
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40 return ngx_cpymem(errstr, msg->data, size);
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41 }
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43
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44 ngx_uint_t
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45 ngx_strerror_init(void)
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46 {
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47 char *msg;
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48 u_char *p;
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49 size_t len;
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50 ngx_err_t err;
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52 /*
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53 * ngx_strerror() is not ready to work at this stage, therefore,
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54 * malloc() is used and possible errors are logged using strerror().
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55 */
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56
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57 len = NGX_SYS_NERR * sizeof(ngx_str_t);
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58
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59 ngx_sys_errlist = malloc(len);
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60 if (ngx_sys_errlist == NULL) {
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61 goto failed;
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62 }
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64 for (err = 0; err < NGX_SYS_NERR; err++) {
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65 msg = strerror(err);
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66 len = ngx_strlen(msg);
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68 p = malloc(len);
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69 if (p == NULL) {
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70 goto failed;
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71 }
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73 ngx_memcpy(p, msg, len);
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74 ngx_sys_errlist[err].len = len;
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75 ngx_sys_errlist[err].data = p;
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76 }
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78 return NGX_OK;
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79
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80 failed:
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82 err = errno;
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83 ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err));
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84
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85 return NGX_ERROR;
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86 }