Mercurial > hg > nginx-quic
view src/os/unix/ngx_errno.c @ 8667:2a7155733855
Core: removed unnecessary restriction in hash initialization.
Hash initialization ignores elements with key.data set to NULL.
Nevertheless, the initial hash bucket size check didn't skip them,
resulting in unnecessary restrictions on, for example, variables with
long names and with the NGX_HTTP_VARIABLE_NOHASH flag.
Fix is to update the initial hash bucket size check to skip elements
with key.data set to NULL, similarly to how it is done in other parts
of the code.
author | Alexey Radkov <alexey.radkov@gmail.com> |
---|---|
date | Thu, 19 Aug 2021 20:51:27 +0300 |
parents | c43a2e8fdf7e |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> static ngx_str_t ngx_unknown_error = ngx_string("Unknown error"); #if (NGX_HAVE_STRERRORDESC_NP) /* * The strerrordesc_np() function, introduced in glibc 2.32, is * async-signal-safe. This makes it possible to use it directly, * without copying error messages. */ u_char * ngx_strerror(ngx_err_t err, u_char *errstr, size_t size) { size_t len; const char *msg; msg = strerrordesc_np(err); if (msg == NULL) { msg = (char *) ngx_unknown_error.data; len = ngx_unknown_error.len; } else { len = ngx_strlen(msg); } size = ngx_min(size, len); return ngx_cpymem(errstr, msg, size); } ngx_int_t ngx_strerror_init(void) { return NGX_OK; } #else /* * 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_err_t ngx_first_error; static ngx_err_t ngx_last_error; u_char * ngx_strerror(ngx_err_t err, u_char *errstr, size_t size) { ngx_str_t *msg; if (err >= ngx_first_error && err < ngx_last_error) { msg = &ngx_sys_errlist[err - ngx_first_error]; } else { msg = &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; #if (NGX_SYS_NERR) ngx_first_error = 0; ngx_last_error = NGX_SYS_NERR; #elif (EPERM > 1000 && EPERM < 0x7fffffff - 1000) /* * If number of errors is not known, and EPERM error code has large * but reasonable value, guess possible error codes based on the error * messages returned by strerror(), starting from EPERM. Notably, * this covers GNU/Hurd, where errors start at 0x40000001. */ for (err = EPERM; err > EPERM - 1000; err--) { ngx_set_errno(0); msg = strerror(err); if (errno == EINVAL || msg == NULL || strncmp(msg, "Unknown error", 13) == 0) { continue; } ngx_first_error = err; } for (err = EPERM; err < EPERM + 1000; err++) { ngx_set_errno(0); msg = strerror(err); if (errno == EINVAL || msg == NULL || strncmp(msg, "Unknown error", 13) == 0) { continue; } ngx_last_error = err + 1; } #else /* * If number of errors is not known, guess it based on the error * messages returned by strerror(). */ ngx_first_error = 0; for (err = 0; err < 1000; err++) { ngx_set_errno(0); msg = strerror(err); if (errno == EINVAL || msg == NULL || strncmp(msg, "Unknown error", 13) == 0) { continue; } ngx_last_error = err + 1; } #endif /* * ngx_strerror() is not ready to work at this stage, therefore, * malloc() is used and possible errors are logged using strerror(). */ len = (ngx_last_error - ngx_first_error) * sizeof(ngx_str_t); ngx_sys_errlist = malloc(len); if (ngx_sys_errlist == NULL) { goto failed; } for (err = ngx_first_error; err < ngx_last_error; err++) { msg = strerror(err); if (msg == NULL) { ngx_sys_errlist[err - ngx_first_error] = ngx_unknown_error; continue; } len = ngx_strlen(msg); p = malloc(len); if (p == NULL) { goto failed; } ngx_memcpy(p, msg, len); ngx_sys_errlist[err - ngx_first_error].len = len; ngx_sys_errlist[err - ngx_first_error].data = p; } return NGX_OK; failed: err = errno; ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err)); return NGX_ERROR; } #endif