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src/os/unix/ngx_errno.c - nginx-1.7.10

Global variables defined

Functions defined

Source code


  2. /*
  3. * Copyright (C) Igor Sysoev
  4. * Copyright (C) Nginx, Inc.
  5. */


  8. #include <ngx_config.h>
  9. #include <ngx_core.h>


  12. /*
  13. * The strerror() messages are copied because:
  14. *
  15. * 1) strerror() and strerror_r() functions are not Async-Signal-Safe,
  16. *    therefore, they cannot be used in signal handlers;
  17. *
  18. * 2) a direct sys_errlist[] array may be used instead of these functions,
  19. *    but Linux linker warns about its usage:
  20. *
  21. * warning: `sys_errlist' is deprecated; use `strerror' or `strerror_r' instead
  22. * warning: `sys_nerr' is deprecated; use `strerror' or `strerror_r' instead
  23. *
  24. *    causing false bug reports.
  25. */


  28. ‌static ngx_str_t  *ngx_sys_errlist;
  29. ‌static ngx_str_t   ngx_unknown_error = ngx_string("Unknown error");


  32. u_char *
  33. ‌ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
  34. {
  35.     ngx_str_t  *msg;

  37.     msg = ((ngx_uint_t) err < NGX_SYS_NERR) ? &ngx_sys_errlist[err]:
  38.                                               &ngx_unknown_error;
  39.     size = ngx_min(size, msg->len);

  41.     return ngx_cpymem(errstr, msg->data, size);
  42. }


  45. ngx_int_t
  46. ‌ngx_strerror_init(void)
  47. {
  48.     char       *msg;
  49.     u_char     *p;
  50.     size_t      len;
  51.     ngx_err_t   err;

  53.     /*
  54.      * ngx_strerror() is not ready to work at this stage, therefore,
  55.      * malloc() is used and possible errors are logged using strerror().
  56.      */

  58.     len = NGX_SYS_NERR * sizeof(ngx_str_t);

  60.     ngx_sys_errlist = malloc(len);
  61.     if (ngx_sys_errlist == NULL) {
  62.         goto failed;
  63.     }

  65.     for (err = 0; err < NGX_SYS_NERR; err++) {
  66.         msg = strerror(err);
  67.         len = ngx_strlen(msg);

  69.         p = malloc(len);
  70.         if (p == NULL) {
  71.             goto failed;
  72.         }

  74.         ngx_memcpy(p, msg, len);
  75.         ngx_sys_errlist[err].len = len;
  76.         ngx_sys_errlist[err].data = p;
  77.     }

  79.     return NGX_OK;

  81. failed:

  83.     err = errno;
  84.     ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err));

  86.     return NGX_ERROR;
  87. }

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