blob: e787b2377edfe89ba5dbae819b4749697c57b5c5 [file] [log] [blame] [raw]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
/*
* The strerror() messages are copied because:
*
* 1) strerror() and strerror_r() functions are not Async-Signal-Safe,
* therefore, they cannot be used in signal handlers;
*
* 2) a direct sys_errlist[] array may be used instead of these functions,
* but Linux linker warns about its usage:
*
* warning: `sys_errlist' is deprecated; use `strerror' or `strerror_r' instead
* warning: `sys_nerr' is deprecated; use `strerror' or `strerror_r' instead
*
* causing false bug reports.
*/
static ngx_str_t *ngx_sys_errlist;
static ngx_str_t ngx_unknown_error = ngx_string("Unknown error");
u_char *
ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
{
ngx_str_t *msg;
msg = ((ngx_uint_t) err < NGX_SYS_NERR) ? &ngx_sys_errlist[err]:
&ngx_unknown_error;
size = ngx_min(size, msg->len);
return ngx_cpymem(errstr, msg->data, size);
}
ngx_int_t
ngx_strerror_init(void)
{
char *msg;
u_char *p;
size_t len;
ngx_err_t err;
/*
* ngx_strerror() is not ready to work at this stage, therefore,
* malloc() is used and possible errors are logged using strerror().
*/
len = NGX_SYS_NERR * sizeof(ngx_str_t);
ngx_sys_errlist = malloc(len);
if (ngx_sys_errlist == NULL) {
goto failed;
}
for (err = 0; err < NGX_SYS_NERR; err++) {
msg = strerror(err);
len = ngx_strlen(msg);
p = malloc(len);
if (p == NULL) {
goto failed;
}
ngx_memcpy(p, msg, len);
ngx_sys_errlist[err].len = len;
ngx_sys_errlist[err].data = p;
}
return NGX_OK;
failed:
err = errno;
ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err));
return NGX_ERROR;
}