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Diffstat (limited to 'src/os/unix/ngx_errno.c')
-rw-r--r--src/os/unix/ngx_errno.c91
1 files changed, 58 insertions, 33 deletions
diff --git a/src/os/unix/ngx_errno.c b/src/os/unix/ngx_errno.c
index a250f496d..02994b808 100644
--- a/src/os/unix/ngx_errno.c
+++ b/src/os/unix/ngx_errno.c
@@ -8,54 +8,79 @@
#include <ngx_core.h>
-#if (NGX_HAVE_STRERROR_R)
+/*
+ * The strerror() messages are copied because:
+ *
+ * 1) strerror() and strerror_r() functions are not Async-Signal-Safe,
+ * therefore, they can not 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.
+ */
-u_char *
-ngx_strerror_r(int err, u_char *errstr, size_t size)
-{
- if (size == 0) {
- return errstr;
- }
- errstr[0] = '\0';
+static ngx_str_t *ngx_sys_errlist;
+static ngx_str_t ngx_unknown_error = ngx_string("Unknown error");
- strerror_r(err, (char *) errstr, size);
- while (*errstr && size) {
- errstr++;
- size--;
- }
+u_char *
+ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
+{
+ ngx_str_t *msg;
- return errstr;
-}
+ msg = ((ngx_uint_t) err < NGX_SYS_NERR) ? &ngx_sys_errlist[err]:
+ &ngx_unknown_error;
+ size = ngx_min(size, msg->len);
-#elif (NGX_HAVE_GNU_STRERROR_R)
+ return ngx_cpymem(errstr, msg->data, size);
+}
-/* Linux strerror_r() */
-u_char *
-ngx_strerror_r(int err, u_char *errstr, size_t size)
+ngx_uint_t
+ngx_strerror_init(void)
{
- char *str;
+ 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);
- if (size == 0) {
- return errstr;
+ ngx_sys_errlist = malloc(len);
+ if (ngx_sys_errlist == NULL) {
+ goto failed;
}
- errstr[0] = '\0';
+ for (err = 0; err < NGX_SYS_NERR; err++) {
+ msg = strerror(err);
+ len = ngx_strlen(msg);
- str = strerror_r(err, (char *) errstr, size);
+ p = malloc(len);
+ if (p == NULL) {
+ goto failed;
+ }
- if (str != (char *) errstr) {
- return ngx_cpystrn(errstr, (u_char *) str, size);
+ ngx_memcpy(p, msg, len);
+ ngx_sys_errlist[err].len = len;
+ ngx_sys_errlist[err].data = p;
}
- while (*errstr && size) {
- errstr++;
- size--;
- }
+ return NGX_OK;
- return errstr;
-}
+failed:
-#endif
+ err = errno;
+ ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err));
+
+ return NGX_ERROR;
+}