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Log: customizable access log format.

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This commit is contained in:
Zhidao HONG
2022-07-28 11:05:04 +08:00
parent 8761501b48
commit 3f8cf62c03
8 changed files with 238 additions and 130 deletions
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6
docs/changes.xml
View File

@@ -62,6 +62,12 @@ variable substitution.
</para> </para>
</change> </change>
<change type="feature">
<para>
customizable access log format.
</para>
</change>
<change type="bugfix"> <change type="bugfix">
<para> <para>
an index file that didn't contain a file extension was incorrectly an index file that didn't contain a file extension was incorrectly

81
src/nxt_conf_validation.c
View File

@@ -202,6 +202,8 @@ static nxt_int_t nxt_conf_vldt_server(nxt_conf_validation_t *vldt,
nxt_str_t *name, nxt_conf_value_t *value); nxt_str_t *name, nxt_conf_value_t *value);
static nxt_int_t nxt_conf_vldt_server_weight(nxt_conf_validation_t *vldt, static nxt_int_t nxt_conf_vldt_server_weight(nxt_conf_validation_t *vldt,
nxt_conf_value_t *value, void *data); nxt_conf_value_t *value, void *data);
static nxt_int_t nxt_conf_vldt_access_log(nxt_conf_validation_t *vldt,
nxt_conf_value_t *value, void *data);
static nxt_int_t nxt_conf_vldt_isolation(nxt_conf_validation_t *vldt, static nxt_int_t nxt_conf_vldt_isolation(nxt_conf_validation_t *vldt,
nxt_conf_value_t *value, void *data); nxt_conf_value_t *value, void *data);
@@ -241,6 +243,7 @@ static nxt_conf_vldt_object_t nxt_conf_vldt_app_namespaces_members[];
#if (NXT_HAVE_ISOLATION_ROOTFS) #if (NXT_HAVE_ISOLATION_ROOTFS)
static nxt_conf_vldt_object_t nxt_conf_vldt_app_automount_members[]; static nxt_conf_vldt_object_t nxt_conf_vldt_app_automount_members[];
#endif #endif
static nxt_conf_vldt_object_t nxt_conf_vldt_access_log_members[];
static nxt_conf_vldt_object_t nxt_conf_vldt_root_members[] = { static nxt_conf_vldt_object_t nxt_conf_vldt_root_members[] = {
@@ -270,7 +273,8 @@ static nxt_conf_vldt_object_t nxt_conf_vldt_root_members[] = {
.u.object = nxt_conf_vldt_upstream, .u.object = nxt_conf_vldt_upstream,
}, { }, {
.name = nxt_string("access_log"), .name = nxt_string("access_log"),
.type = NXT_CONF_VLDT_STRING, .type = NXT_CONF_VLDT_STRING | NXT_CONF_VLDT_OBJECT,
.validator = nxt_conf_vldt_access_log,
}, },
NXT_CONF_VLDT_END NXT_CONF_VLDT_END
@@ -1205,6 +1209,19 @@ static nxt_conf_vldt_object_t nxt_conf_vldt_upstream_server_members[] = {
}; };
static nxt_conf_vldt_object_t nxt_conf_vldt_access_log_members[] = {
{
.name = nxt_string("path"),
.type = NXT_CONF_VLDT_STRING,
}, {
.name = nxt_string("format"),
.type = NXT_CONF_VLDT_STRING,
},
NXT_CONF_VLDT_END
};
nxt_int_t nxt_int_t
nxt_conf_validate(nxt_conf_validation_t *vldt) nxt_conf_validate(nxt_conf_validation_t *vldt)
{ {
@@ -3090,3 +3107,65 @@ nxt_conf_vldt_server_weight(nxt_conf_validation_t *vldt,
return NXT_OK; return NXT_OK;
} }
typedef struct {
nxt_str_t path;
nxt_str_t format;
} nxt_conf_vldt_access_log_conf_t;
static nxt_conf_map_t nxt_conf_vldt_access_log_map[] = {
{
nxt_string("path"),
NXT_CONF_MAP_STR,
offsetof(nxt_conf_vldt_access_log_conf_t, path),
},
{
nxt_string("format"),
NXT_CONF_MAP_STR,
offsetof(nxt_conf_vldt_access_log_conf_t, format),
},
};
static nxt_int_t
nxt_conf_vldt_access_log(nxt_conf_validation_t *vldt, nxt_conf_value_t *value,
void *data)
{
nxt_int_t ret;
nxt_conf_vldt_access_log_conf_t conf;
static nxt_str_t format_str = nxt_string("format");
if (nxt_conf_type(value) == NXT_CONF_STRING) {
return NXT_OK;
}
ret = nxt_conf_vldt_object(vldt, value, nxt_conf_vldt_access_log_members);
if (ret != NXT_OK) {
return ret;
}
nxt_memzero(&conf, sizeof(nxt_conf_vldt_access_log_conf_t));
ret = nxt_conf_map_object(vldt->pool, value,
nxt_conf_vldt_access_log_map,
nxt_nitems(nxt_conf_vldt_access_log_map),
&conf);
if (ret != NXT_OK) {
return ret;
}
if (conf.path.length == 0) {
return nxt_conf_vldt_error(vldt,
"The \"path\" string must not be empty.");
}
if (nxt_is_var(&conf.format)) {
return nxt_conf_vldt_var(vldt, &format_str, &conf.format);
}
return NXT_OK;
}

9
src/nxt_http_request.c
View File

@@ -791,6 +791,7 @@ nxt_http_request_error_handler(nxt_task_t *task, void *obj, void *data)
void void
nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data) nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data)
{ {
nxt_var_t *log_format;
nxt_http_proto_t proto; nxt_http_proto_t proto;
nxt_http_request_t *r; nxt_http_request_t *r;
nxt_http_protocol_t protocol; nxt_http_protocol_t protocol;
@@ -800,20 +801,22 @@ nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data)
r = obj; r = obj;
proto.any = data; proto.any = data;
nxt_debug(task, "http request close handler");
conf = r->conf; conf = r->conf;
if (!r->logged) { if (!r->logged) {
r->logged = 1; r->logged = 1;
access_log = conf->socket_conf->router_conf->access_log; access_log = conf->socket_conf->router_conf->access_log;
log_format = conf->socket_conf->router_conf->log_format;
if (access_log != NULL) { if (access_log != NULL) {
access_log->handler(task, r, access_log); access_log->handler(task, r, access_log, log_format);
return;
} }
} }
nxt_debug(task, "http request close handler");
r->proto.any = NULL; r->proto.any = NULL;
if (r->body != NULL && nxt_buf_is_file(r->body) if (r->body != NULL && nxt_buf_is_file(r->body)

5
src/nxt_http_static.c
View File

@@ -104,7 +104,7 @@ nxt_http_static_init(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
cv = nxt_conf_get_array_element_or_itself(acf->share, i); cv = nxt_conf_get_array_element_or_itself(acf->share, i);
nxt_conf_get_string(cv, &str); nxt_conf_get_string(cv, &str);
var = nxt_var_compile(&str, mp, rtcf->var_fields, 1); var = nxt_var_compile(&str, mp, rtcf->var_fields, NXT_VAR_STRZ);
if (nxt_slow_path(var == NULL)) { if (nxt_slow_path(var == NULL)) {
return NXT_ERROR; return NXT_ERROR;
} }
@@ -130,7 +130,8 @@ nxt_http_static_init(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
nxt_str_t chr, shr; nxt_str_t chr, shr;
nxt_bool_t is_const; nxt_bool_t is_const;
conf->chroot = nxt_var_compile(&acf->chroot, mp, rtcf->var_fields, 1); conf->chroot = nxt_var_compile(&acf->chroot, mp, rtcf->var_fields,
NXT_VAR_STRZ);
if (nxt_slow_path(conf->chroot == NULL)) { if (nxt_slow_path(conf->chroot == NULL)) {
return NXT_ERROR; return NXT_ERROR;
} }

4
src/nxt_router.h
View File

@@ -53,6 +53,7 @@ typedef struct {
nxt_lvlhsh_t apps_hash; nxt_lvlhsh_t apps_hash;
nxt_router_access_log_t *access_log; nxt_router_access_log_t *access_log;
nxt_var_t *log_format;
} nxt_router_conf_t; } nxt_router_conf_t;
@@ -223,7 +224,8 @@ typedef struct {
struct nxt_router_access_log_s { struct nxt_router_access_log_s {
void (*handler)(nxt_task_t *task, nxt_http_request_t *r, void (*handler)(nxt_task_t *task, nxt_http_request_t *r,
nxt_router_access_log_t *access_log); nxt_router_access_log_t *access_log,
nxt_var_t *format);
nxt_fd_t fd; nxt_fd_t fd;
nxt_str_t path; nxt_str_t path;
uint32_t count; uint32_t count;

222
src/nxt_router_access_log.c
View File

@@ -10,10 +10,25 @@
#include <nxt_http.h> #include <nxt_http.h>
typedef struct {
nxt_str_t path;
nxt_str_t format;
} nxt_router_access_log_conf_t;
typedef struct {
nxt_str_t text;
nxt_router_access_log_t *access_log;
} nxt_router_access_log_ctx_t;
static void nxt_router_access_log_writer(nxt_task_t *task, static void nxt_router_access_log_writer(nxt_task_t *task,
nxt_http_request_t *r, nxt_router_access_log_t *access_log); nxt_http_request_t *r, nxt_router_access_log_t *access_log,
static u_char *nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now, nxt_var_t *format);
struct tm *tm, size_t size, const char *format); static void nxt_router_access_log_write_ready(nxt_task_t *task, void *obj,
void *data);
static void nxt_router_access_log_write_error(nxt_task_t *task, void *obj,
void *data);
static void nxt_router_access_log_ready(nxt_task_t *task, static void nxt_router_access_log_ready(nxt_task_t *task,
nxt_port_recv_msg_t *msg, void *data); nxt_port_recv_msg_t *msg, void *data);
static void nxt_router_access_log_error(nxt_task_t *task, static void nxt_router_access_log_error(nxt_task_t *task,
@@ -26,26 +41,63 @@ static void nxt_router_access_log_reopen_error(nxt_task_t *task,
nxt_port_recv_msg_t *msg, void *data); nxt_port_recv_msg_t *msg, void *data);
static nxt_conf_map_t nxt_router_access_log_conf[] = {
{
nxt_string("path"),
NXT_CONF_MAP_STR,
offsetof(nxt_router_access_log_conf_t, path),
},
{
nxt_string("format"),
NXT_CONF_MAP_STR,
offsetof(nxt_router_access_log_conf_t, format),
},
};
nxt_int_t nxt_int_t
nxt_router_access_log_create(nxt_task_t *task, nxt_router_conf_t *rtcf, nxt_router_access_log_create(nxt_task_t *task, nxt_router_conf_t *rtcf,
nxt_conf_value_t *value) nxt_conf_value_t *value)
{ {
nxt_str_t path; u_char *p;
nxt_int_t ret;
nxt_str_t str;
nxt_var_t *format;
nxt_router_t *router; nxt_router_t *router;
nxt_router_access_log_t *access_log; nxt_router_access_log_t *access_log;
nxt_router_access_log_conf_t alcf;
static nxt_str_t log_format_str = nxt_string("$remote_addr - - "
"[$time_local] \"$request_line\" $status $body_bytes_sent "
"\"$header_referer\" \"$header_user_agent\"");
alcf.format = log_format_str;
if (nxt_conf_type(value) == NXT_CONF_STRING) {
nxt_conf_get_string(value, &alcf.path);
} else {
ret = nxt_conf_map_object(rtcf->mem_pool, value,
nxt_router_access_log_conf,
nxt_nitems(nxt_router_access_log_conf),
&alcf);
if (ret != NXT_OK) {
nxt_alert(task, "access log map error");
return NXT_ERROR;
}
}
router = nxt_router; router = nxt_router;
nxt_conf_get_string(value, &path);
access_log = router->access_log; access_log = router->access_log;
if (access_log != NULL && nxt_strstr_eq(&path, &access_log->path)) { if (access_log != NULL && nxt_strstr_eq(&alcf.path, &access_log->path)) {
nxt_router_access_log_use(&router->lock, access_log); nxt_router_access_log_use(&router->lock, access_log);
} else { } else {
access_log = nxt_malloc(sizeof(nxt_router_access_log_t) access_log = nxt_malloc(sizeof(nxt_router_access_log_t)
+ path.length); + alcf.path.length);
if (access_log == NULL) { if (access_log == NULL) {
nxt_alert(task, "failed to allocate access log structure"); nxt_alert(task, "failed to allocate access log structure");
return NXT_ERROR; return NXT_ERROR;
@@ -55,14 +107,32 @@ nxt_router_access_log_create(nxt_task_t *task, nxt_router_conf_t *rtcf,
access_log->handler = &nxt_router_access_log_writer; access_log->handler = &nxt_router_access_log_writer;
access_log->count = 1; access_log->count = 1;
access_log->path.length = path.length; access_log->path.length = alcf.path.length;
access_log->path.start = (u_char *) access_log access_log->path.start = (u_char *) access_log
+ sizeof(nxt_router_access_log_t); + sizeof(nxt_router_access_log_t);
nxt_memcpy(access_log->path.start, path.start, path.length); nxt_memcpy(access_log->path.start, alcf.path.start, alcf.path.length);
}
str.length = alcf.format.length + 1;
str.start = nxt_malloc(str.length);
if (str.start == NULL) {
nxt_alert(task, "failed to allocate log format structure");
return NXT_ERROR;
}
p = nxt_cpymem(str.start, alcf.format.start, alcf.format.length);
*p = '\n';
format = nxt_var_compile(&str, rtcf->mem_pool, rtcf->var_fields,
NXT_VAR_LOGGING);
if (nxt_slow_path(format == NULL)) {
return NXT_ERROR;
} }
rtcf->access_log = access_log; rtcf->access_log = access_log;
rtcf->log_format = format;
return NXT_OK; return NXT_OK;
} }
@@ -70,130 +140,56 @@ nxt_router_access_log_create(nxt_task_t *task, nxt_router_conf_t *rtcf,
static void static void
nxt_router_access_log_writer(nxt_task_t *task, nxt_http_request_t *r, nxt_router_access_log_writer(nxt_task_t *task, nxt_http_request_t *r,
nxt_router_access_log_t *access_log) nxt_router_access_log_t *access_log, nxt_var_t *format)
{ {
size_t size; nxt_int_t ret;
u_char *buf, *p; nxt_router_access_log_ctx_t *ctx;
nxt_off_t bytes;
static nxt_time_string_t date_cache = { ctx = nxt_mp_get(r->mem_pool, sizeof(nxt_router_access_log_ctx_t));
(nxt_atomic_uint_t) -1, if (nxt_slow_path(ctx == NULL)) {
nxt_router_access_log_date,
"%02d/%s/%4d:%02d:%02d:%02d %c%02d%02d",
nxt_length("31/Dec/1986:19:40:00 +0300"),
NXT_THREAD_TIME_LOCAL,
NXT_THREAD_TIME_SEC,
};
size = r->remote->address_length
+ 6 /* ' - - [' */
+ date_cache.size
+ 3 /* '] "' */
+ r->method->length
+ 1 /* space */
+ r->target.length
+ 1 /* space */
+ r->version.length
+ 2 /* '" ' */
+ 3 /* status */
+ 1 /* space */
+ NXT_OFF_T_LEN
+ 2 /* ' "' */
+ (r->referer != NULL ? r->referer->value_length : 1)
+ 3 /* '" "' */
+ (r->user_agent != NULL ? r->user_agent->value_length : 1)
+ 2 /* '"\n' */
;
buf = nxt_mp_nget(r->mem_pool, size);
if (nxt_slow_path(buf == NULL)) {
return; return;
} }
p = nxt_cpymem(buf, nxt_sockaddr_address(r->remote), ctx->access_log = access_log;
r->remote->address_length);
p = nxt_cpymem(p, " - - [", 6); if (nxt_var_is_const(format)) {
nxt_var_raw(format, &ctx->text);
p = nxt_thread_time_string(task->thread, &date_cache, p); nxt_router_access_log_write_ready(task, r, ctx);
p = nxt_cpymem(p, "] \"", 3);
if (r->method->length != 0) {
p = nxt_cpymem(p, r->method->start, r->method->length);
if (r->target.length != 0) {
*p++ = ' ';
p = nxt_cpymem(p, r->target.start, r->target.length);
if (r->version.length != 0) {
*p++ = ' ';
p = nxt_cpymem(p, r->version.start, r->version.length);
}
}
} else { } else {
*p++ = '-'; ret = nxt_var_query_init(&r->var_query, r, r->mem_pool);
if (nxt_slow_path(ret != NXT_OK)) {
return;
} }
p = nxt_cpymem(p, "\" ", 2); nxt_var_query(task, r->var_query, format, &ctx->text);
nxt_var_query_resolve(task, r->var_query, ctx,
p = nxt_sprintf(p, p + 3, "%03d", r->status); nxt_router_access_log_write_ready,
nxt_router_access_log_write_error);
*p++ = ' ';
bytes = nxt_http_proto[r->protocol].body_bytes_sent(task, r->proto);
p = nxt_sprintf(p, p + NXT_OFF_T_LEN, "%O", bytes);
p = nxt_cpymem(p, " \"", 2);
if (r->referer != NULL) {
p = nxt_cpymem(p, r->referer->value, r->referer->value_length);
} else {
*p++ = '-';
} }
p = nxt_cpymem(p, "\" \"", 3);
if (r->user_agent != NULL) {
p = nxt_cpymem(p, r->user_agent->value, r->user_agent->value_length);
} else {
*p++ = '-';
}
p = nxt_cpymem(p, "\"\n", 2);
nxt_fd_write(access_log->fd, buf, p - buf);
} }
static u_char * static void
nxt_router_access_log_date(u_char *buf, nxt_realtime_t *now, struct tm *tm, nxt_router_access_log_write_ready(nxt_task_t *task, void *obj, void *data)
size_t size, const char *format)
{ {
u_char sign; nxt_http_request_t *r;
time_t gmtoff; nxt_router_access_log_ctx_t *ctx;
static const char *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", r = obj;
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; ctx = data;
gmtoff = nxt_timezone(tm) / 60; nxt_fd_write(ctx->access_log->fd, ctx->text.start, ctx->text.length);
if (gmtoff < 0) { nxt_http_request_close_handler(task, r, r->proto.any);
gmtoff = -gmtoff; }
sign = '-';
} else {
sign = '+';
}
return nxt_sprintf(buf, buf + size, format, static void
tm->tm_mday, month[tm->tm_mon], tm->tm_year + 1900, nxt_router_access_log_write_error(nxt_task_t *task, void *obj, void *data)
tm->tm_hour, tm->tm_min, tm->tm_sec, {
sign, gmtoff / 60, gmtoff % 60);
} }

25
src/nxt_var.c
View File

@@ -9,7 +9,7 @@
struct nxt_var_s { struct nxt_var_s {
size_t length; size_t length;
nxt_uint_t vars; nxt_uint_t vars;
uint8_t strz; /* 1 bit */ nxt_var_flags_t flags;
u_char data[]; u_char data[];
/* /*
@@ -331,11 +331,12 @@ nxt_var_index_init(void)
nxt_var_t * nxt_var_t *
nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields, nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields,
nxt_bool_t strz) nxt_var_flags_t flags)
{ {
u_char *p, *end, *next, *src; u_char *p, *end, *next, *src;
size_t size; size_t size;
uint32_t index; uint32_t index;
nxt_bool_t strz;
nxt_var_t *var; nxt_var_t *var;
nxt_str_t part; nxt_str_t part;
nxt_uint_t n; nxt_uint_t n;
@@ -343,6 +344,8 @@ nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields,
nxt_var_sub_t *subs; nxt_var_sub_t *subs;
nxt_var_decl_t *decl; nxt_var_decl_t *decl;
strz = (flags & NXT_VAR_STRZ) != 0;
n = 0; n = 0;
p = str->start; p = str->start;
@@ -368,7 +371,7 @@ nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields,
var->length = str->length; var->length = str->length;
var->vars = n; var->vars = n;
var->strz = strz; var->flags = flags;
subs = nxt_var_subs(var); subs = nxt_var_subs(var);
src = nxt_var_raw_start(var); src = nxt_var_raw_start(var);
@@ -568,6 +571,7 @@ nxt_var_query(nxt_task_t *task, nxt_var_query_t *query, nxt_var_t *var,
size_t length, last, next; size_t length, last, next;
nxt_str_t *value, **part; nxt_str_t *value, **part;
nxt_uint_t i; nxt_uint_t i;
nxt_bool_t strz, logging;
nxt_array_t parts; nxt_array_t parts;
nxt_var_sub_t *subs; nxt_var_sub_t *subs;
@@ -583,6 +587,9 @@ nxt_var_query(nxt_task_t *task, nxt_var_query_t *query, nxt_var_t *var,
nxt_memzero(&parts, sizeof(nxt_array_t)); nxt_memzero(&parts, sizeof(nxt_array_t));
nxt_array_init(&parts, query->pool, sizeof(nxt_str_t *)); nxt_array_init(&parts, query->pool, sizeof(nxt_str_t *));
strz = (var->flags & NXT_VAR_STRZ) != 0;
logging = (var->flags & NXT_VAR_LOGGING) != 0;
subs = nxt_var_subs(var); subs = nxt_var_subs(var);
length = var->length; length = var->length;
@@ -601,9 +608,13 @@ nxt_var_query(nxt_task_t *task, nxt_var_query_t *query, nxt_var_t *var,
*part = value; *part = value;
length += value->length - subs[i].length; length += value->length - subs[i].length;
if (logging && value->start == NULL) {
length += 1;
}
} }
p = nxt_mp_nget(query->pool, length + var->strz); p = nxt_mp_nget(query->pool, length + strz);
if (nxt_slow_path(p == NULL)) { if (nxt_slow_path(p == NULL)) {
goto fail; goto fail;
} }
@@ -625,6 +636,10 @@ nxt_var_query(nxt_task_t *task, nxt_var_query_t *query, nxt_var_t *var,
p = nxt_cpymem(p, part[i]->start, part[i]->length); p = nxt_cpymem(p, part[i]->start, part[i]->length);
if (logging && part[i]->start == NULL) {
*p++ = '-';
}
last = next + subs[i].length; last = next + subs[i].length;
} }
@@ -632,7 +647,7 @@ nxt_var_query(nxt_task_t *task, nxt_var_query_t *query, nxt_var_t *var,
p = nxt_cpymem(p, &src[last], var->length - last); p = nxt_cpymem(p, &src[last], var->length - last);
} }
if (var->strz) { if (strz) {
*p = '\0'; *p = '\0';
} }

8
src/nxt_var.h
View File

@@ -32,6 +32,12 @@ typedef struct {
} nxt_var_field_t; } nxt_var_field_t;
typedef enum {
NXT_VAR_STRZ = 1 << 0,
NXT_VAR_LOGGING = 1 << 1,
} nxt_var_flags_t;
nxt_inline nxt_bool_t nxt_inline nxt_bool_t
nxt_is_var(nxt_str_t *str) nxt_is_var(nxt_str_t *str)
{ {
@@ -45,7 +51,7 @@ nxt_int_t nxt_var_index_init(void);
nxt_var_field_t *nxt_var_field_get(nxt_array_t *fields, uint16_t index); nxt_var_field_t *nxt_var_field_get(nxt_array_t *fields, uint16_t index);
nxt_var_t *nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields, nxt_var_t *nxt_var_compile(nxt_str_t *str, nxt_mp_t *mp, nxt_array_t *fields,
nxt_bool_t strz); nxt_var_flags_t flags);
nxt_int_t nxt_var_test(nxt_str_t *str, nxt_array_t *fields, u_char *error); nxt_int_t nxt_var_test(nxt_str_t *str, nxt_array_t *fields, u_char *error);
nxt_bool_t nxt_var_is_const(nxt_var_t *var); nxt_bool_t nxt_var_is_const(nxt_var_t *var);