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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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604
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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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640
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15 * therefore, they cannot be used in signal handlers;
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604
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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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0
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25
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26
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604
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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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0
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29
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30
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422
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31 u_char *
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604
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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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42
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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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0
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46 {
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604
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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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0
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51
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604
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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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0
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62 }
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63
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604
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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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0
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67
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604
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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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0
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72
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604
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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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0
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76 }
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77
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604
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78 return NGX_OK;
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79
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80 failed:
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0
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81
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604
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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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0
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86 }
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