Finally, there is a user notice this problem :)
It's supposed to be fixed by my patch, but I'm holding commit.
I appreciate if you could help to test the patch.
1) Download latest snapshot
http://snaps.php.net/
2) Apply attached patch.
patch -p0 < session.diff
in php source root.
--
Yasuo Ohgaki
Rick Morris wrote:
> I have tried mm as a session handler three times, on three different Linux
> boxes. Each one was a server under heavy load, running many concurrent
> sessions, so I was hoping mm would solve some performance issues, but have
> been disappointed each time.
>
> So far, I am 0 for 3 on this, having done _everything_ by the book. I am
> running completely standard stuff: Apache (latest source), MySQL, PHP 4.0.6,
> or PHP 4.1.1. On two mature kernels ( 2.2.19, and 2.4.17), using either the
> RPM for mm, or compiling from source, I have come up against the same wall:
>
> Every time I try one of these heavy-load systems with the mm session
> handler, performance gets WORSE instead of better. On the latest system
> (Dual 1.1 GHz, 2 GB RAM, 4-disk RAID 0+1), I was losing sessions left and
> right. The system could only handle about 100-150 concurrent users before
> session keys started disappearing, and users would get logged out, On kernel
> 2.2.19, over a period of minutes, performance would deteriorate until I
> started getting segfaults. On each system, when I went back to "files" as a
> session handler, the problem went away.
>
> So, is there something I am doing wrong? Is there some trick to configuring
> mm and PHP, that is not documented, or is there a problem with Linux and mm
> itself? Has anyone here successfully used mm as a session handler? On a
> high-performance system?
>
> Any ideas, or should I submit this as a bug? If so, is it a bug with Linux,
> with the MM library, or with PHP?
>
> Thanks,
>
> Rick Morris
>
>
? ext/session/tmp.diff
? ext/session/bak
Index: ext/session//mod_files.c
===================================================================
RCS file: /repository/php4/ext/session/mod_files.c,v
retrieving revision 1.67
diff -u -r1.67 mod_files.c
--- ext/session//mod_files.c 3 Feb 2002 05:40:19 -0000 1.67
+++ ext/session//mod_files.c 5 Feb 2002 03:24:15 -0000
@@ -16,7 +16,7 @@
+----------------------------------------------------------------------+
*/
-/* $Id: mod_files.c,v 1.67 2002/02/03 05:40:19 yohgaki Exp $ */
+/* $Id: mod_files.c,v 1.66 2002/02/03 03:17:35 yohgaki Exp $ */
#include "php.h"
@@ -123,7 +123,7 @@
}
}
-static void ps_files_open(ps_files *data, const char *key)
+static int ps_files_open(ps_files *data, const char *key)
{
char buf[MAXPATHLEN];
TSRMLS_FETCH();
@@ -138,7 +138,7 @@
if (!ps_files_valid_key(key) ||
!ps_files_path_create(buf, sizeof(buf), data, key))
- return;
+ return FAILURE;
data->lastkey = estrdup(key);
@@ -153,10 +153,13 @@
if (data->fd != -1)
flock(data->fd, LOCK_EX);
- if (data->fd == -1)
+ if (data->fd == -1) {
php_error(E_WARNING, "open(%s, O_RDWR) failed: %s (%d)", buf,
strerror(errno), errno);
+ return FAILURE;
+ }
}
+ return SUCCESS;
}
static int ps_files_cleanup_dir(const char *dirname, int maxlifetime)
@@ -254,7 +257,9 @@
struct stat sbuf;
PS_FILES_DATA;
- ps_files_open(data, key);
+ if (ps_files_open(data, key) == FAILURE)
+ return FAILURE;
+
if (data->fd < 0)
return FAILURE;
@@ -283,7 +288,9 @@
long n;
PS_FILES_DATA;
- ps_files_open(data, key);
+ if (ps_files_open(data, key) == FAILURE)
+ return FAILURE;
+
if (data->fd < 0)
return FAILURE;
Index: ext/session//mod_mm.c
===================================================================
RCS file: /repository/php4/ext/session/mod_mm.c,v
retrieving revision 1.31
diff -u -r1.31 mod_mm.c
--- ext/session//mod_mm.c 25 Jan 2002 20:59:24 -0000 1.31
+++ ext/session//mod_mm.c 5 Feb 2002 03:24:15 -0000
@@ -319,7 +319,6 @@
{
PS_MM_DATA;
ps_sd *sd;
- int ret = FAILURE;
mm_lock(data->mm, MM_LOCK_RD);
@@ -329,12 +328,14 @@
*val = emalloc(sd->datalen + 1);
memcpy(*val, sd->data, sd->datalen);
(*val)[sd->datalen] = '\0';
- ret = SUCCESS;
}
-
+ else {
+ *val = estrdup("\0");
+ }
+
mm_unlock(data->mm);
- return ret;
+ return SUCCESS;
}
PS_WRITE_FUNC(mm)
Index: ext/session//php_session.h
===================================================================
RCS file: /repository/php4/ext/session/php_session.h,v
retrieving revision 1.68
diff -u -r1.68 php_session.h
--- ext/session//php_session.h 5 Feb 2002 01:28:55 -0000 1.68
+++ ext/session//php_session.h 5 Feb 2002 03:24:15 -0000
@@ -61,11 +61,16 @@
#x, ps_open_##x, ps_close_##x, ps_read_##x, ps_write_##x, \
ps_delete_##x, ps_gc_##x
-typedef enum {
- php_session_disabled,
- php_session_none,
- php_session_active
-} php_session_status;
+/* typedef enum { */
+/* php_session_disabled, */
+/* php_session_none, */
+/* php_session_active */
+/* } php_session_status; */
+
+#define PS_DISABLED 1
+#define PS_NONE 2
+#define PS_ACTIVE 4
+#define PS_ERROR 8
typedef struct _php_ps_globals {
char *save_path;
@@ -79,10 +84,11 @@
char *cookie_path;
char *cookie_domain;
zend_bool cookie_secure;
+ long rinit_mod;
ps_module *mod;
void *mod_data;
HashTable vars;
- php_session_status session_status;
+ long session_status;
long gc_probability;
long gc_maxlifetime;
int module_number;
Index: ext/session//session.c
===================================================================
RCS file: /repository/php4/ext/session/session.c,v
retrieving revision 1.275
diff -u -r1.275 session.c
--- ext/session//session.c 5 Feb 2002 01:30:22 -0000 1.275
+++ ext/session//session.c 5 Feb 2002 03:24:16 -0000
@@ -87,7 +87,7 @@
static void php_session_output_handler(char *output, uint output_len, char
**handled_output, uint *handled_output_len, int mode TSRMLS_DC)
{
- if ((PS(session_status) == php_session_active)) {
+ if ((PS(session_status) & PS_ACTIVE)) {
*handled_output = url_adapt_ext_ex(output, output_len,
PS(session_name), PS(id), handled_output_len, (zend_bool) (mode&PHP_OUTPUT_HANDLER_END
? 1 : 0) TSRMLS_CC);
} else {
*handled_output = NULL;
@@ -128,9 +128,12 @@
static PHP_INI_MH(OnUpdateSerializer)
{
PS(serializer) = _php_find_ps_serializer(new_value TSRMLS_CC);
- if(!PS(serializer)) {
- php_error(E_ERROR,"Cannot find serialization handler %s",new_value);
- }
+/* Following lines are commented out to prevent bogus error message at
+ start up. i.e. Serializer modules are not initilzied before Session
+ module. */
+/* if(!PS(serializer)) { */
+/* php_error(E_ERROR,"Cannot find serialization handler %s",new_value); */
+/* } */
return SUCCESS;
}
@@ -477,18 +480,23 @@
{
char *ret = NULL;
- if (PS(serializer)->encode(&ret, newlen TSRMLS_CC) == FAILURE)
+ if (PS(serializer)->encode(&ret, newlen TSRMLS_CC) == FAILURE) {
+ PS(session_status) = PS_ERROR;
ret = NULL;
-
+ }
+
return ret;
}
static void php_session_decode(const char *val, int vallen TSRMLS_DC)
{
- php_session_track_init(TSRMLS_C);
- if (PS(serializer)->decode(val, vallen TSRMLS_CC) == FAILURE) {
- php_session_destroy(TSRMLS_C);
- php_error(E_WARNING, "Failed to decode session object. Session has
been destroyed.");
+ if (PS(session_status) & PS_ACTIVE) {
+ php_session_track_init(TSRMLS_C);
+ if (PS(serializer)->decode(val, vallen TSRMLS_CC) == FAILURE) {
+ PS(session_status) = PS_ERROR;
+ php_session_destroy(TSRMLS_C);
+ php_error(E_WARNING, "Failed to decode session object. Session
+has been destroyed.");
+ }
}
}
@@ -549,13 +557,17 @@
int vallen;
if (PS(mod)->open(&PS(mod_data), PS(save_path), PS(session_name)) == FAILURE) {
- php_error(E_ERROR, "Failed to initialize session module");
+ PS(session_status) = PS_ERROR;
+ php_error(E_WARNING, "Failed to initialize session module");
return;
}
- if (PS(mod)->read(&PS(mod_data), PS(id), &val, &vallen) == SUCCESS) {
- php_session_decode(val, vallen TSRMLS_CC);
- efree(val);
+ if (PS(mod)->read(&PS(mod_data), PS(id), &val, &vallen) == FAILURE) {
+ PS(session_status) = PS_ERROR;
+ php_error(E_WARNING, "Failed to read session data");
+ return;
}
+ php_session_decode(val, vallen TSRMLS_CC);
+ efree(val);
}
@@ -569,16 +581,14 @@
ulong num_key;
HashPosition pos;
- if (!PG(register_globals) && !PS(http_session_vars)) {
+ if ((!PG(register_globals) && !PS(http_session_vars)) || (PS(session_status) &
+(PS_DISABLED|PS_NONE|PS_ERROR))) {
return;
}
- if (PS(http_session_vars)) {
- for
(zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(PS(http_session_vars)), &pos);
-
zend_hash_get_current_key_ex(Z_ARRVAL_P(PS(http_session_vars)), &variable,
&variable_len, &num_key, 0, &pos) == HASH_KEY_IS_STRING;
-
zend_hash_move_forward_ex(Z_ARRVAL_P(PS(http_session_vars)),&pos)) {
- PS_ADD_VARL(variable,variable_len-1);
- }
+ for (zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(PS(http_session_vars)),
+&pos);
+ zend_hash_get_current_key_ex(Z_ARRVAL_P(PS(http_session_vars)),
+&variable, &variable_len, &num_key, 0, &pos) == HASH_KEY_IS_STRING;
+ zend_hash_move_forward_ex(Z_ARRVAL_P(PS(http_session_vars)),&pos)) {
+ PS_ADD_VARL(variable,variable_len-1);
}
if (PS(mod_data)) {
@@ -591,13 +601,14 @@
}
}
- if (ret == FAILURE)
+ if (ret == FAILURE) {
+ PS(session_status) = PS_ERROR;
php_error(E_WARNING, "Failed to write session data (%s). Please "
- "verify that the current setting of session.save_path "
- "is correct (%s)",
- PS(mod)->name,
- PS(save_path));
-
+ "verify that the current setting of
+session.save_path "
+ "is correct (%s)",
+ PS(mod)->name,
+ PS(save_path));
+ }
if (PS(mod_data))
PS(mod)->close(&PS(mod_data));
@@ -744,6 +755,7 @@
smart_str ncookie = {0};
char *date_fmt = NULL;
+
if (SG(headers_sent)) {
char *output_start_filename = php_get_output_start_filename(TSRMLS_C);
int output_start_lineno = php_get_output_start_lineno(TSRMLS_C);
@@ -834,10 +846,11 @@
int module_number = PS(module_number);
int nrand;
int lensess;
+ smart_str var = {0};
PS(apply_trans_sid) = PS(use_trans_sid);
- if (PS(session_status) != php_session_none)
+ if (PS(session_status) & (PS_ACTIVE|PS_ERROR))
return;
lensess = strlen(PS(session_name));
@@ -927,30 +940,23 @@
php_session_send_cookie(TSRMLS_C);
}
-
- if (PS(apply_trans_sid)) {
- smart_str var = {0};
-
- smart_str_appends(&var, PS(session_name));
- smart_str_appendc(&var, '=');
- smart_str_appends(&var, PS(id));
- smart_str_0(&var);
- REGISTER_STRING_CONSTANT("SID", var.c, 0);
- } else {
- REGISTER_STRING_CONSTANT("SID", empty_string, 0);
- }
-
- PS(session_status) = php_session_active;
+ smart_str_appends(&var, PS(session_name));
+ smart_str_appendc(&var, '=');
+ smart_str_appends(&var, PS(id));
+ smart_str_0(&var);
+ REGISTER_STRING_CONSTANT("SID", var.c, 0);
if (PS(apply_trans_sid)) {
php_session_start_output_handler(4096 TSRMLS_CC);
}
+ PS(session_status) = PS_ACTIVE;
+
php_session_cache_limiter(TSRMLS_C);
php_session_initialize(TSRMLS_C);
- if (PS(mod_data) && PS(gc_probability) > 0) {
+ if ((PS(session_status) & PS_ACTIVE) && PS(gc_probability) > 0) {
int nrdels = -1;
-
+
nrand = (int) (100.0*php_combined_lcg(TSRMLS_C));
if (nrand < PS(gc_probability)) {
PS(mod)->gc(&PS(mod_data), PS(gc_maxlifetime), &nrdels);
@@ -962,18 +968,20 @@
}
}
+
static zend_bool php_session_destroy(TSRMLS_D)
{
zend_bool retval = SUCCESS;
- if (PS(session_status) != php_session_active) {
- php_error(E_WARNING, "Trying to destroy uninitialized session");
+ if (PS(session_status) & (PS_DISABLED|PS_NONE|PS_ERROR)) {
+ php_error(E_NOTICE, "Trying to destroy uninitialized session");
return FAILURE;
}
if (PS(mod)->destroy(&PS(mod_data), PS(id)) == FAILURE) {
+ PS(session_status) = PS_ERROR;
retval = FAILURE;
- php_error(E_WARNING, "Session object destruction failed");
+ php_error(E_NOTICE, "Session object destruction failed");
}
php_rshutdown_session_globals(TSRMLS_C);
@@ -1000,9 +1008,15 @@
PS(cookie_lifetime) = Z_LVAL_PP(lifetime);
if (ZEND_NUM_ARGS() > 1) {
+ if (PS(session_status) & (PS_ACTIVE)) {
+ php_error(E_NOTICE, "%s() cannot set cookie parameter once
+session is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
+
convert_to_string_ex(path);
zend_alter_ini_entry("session.cookie_path",
sizeof("session.cookie_path"), Z_STRVAL_PP(path), Z_STRLEN_PP(path), PHP_INI_USER,
PHP_INI_STAGE_RUNTIME);
-
+
if (ZEND_NUM_ARGS() > 2) {
convert_to_string_ex(domain);
zend_alter_ini_entry("session.cookie_domain",
sizeof("session.cookie_domain"), Z_STRVAL_PP(domain), Z_STRLEN_PP(domain),
PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
@@ -1012,6 +1026,7 @@
}
}
}
+
}
/* }}} */
@@ -1049,6 +1064,12 @@
WRONG_PARAM_COUNT;
if (ac == 1) {
+ if (PS(session_status) & PS_ACTIVE) {
+ efree(old);
+ php_error(E_NOTICE, "%s() cannot set session name once session
+is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
convert_to_string_ex(p_name);
zend_alter_ini_entry("session.name", sizeof("session.name"),
Z_STRVAL_PP(p_name), Z_STRLEN_PP(p_name), PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
}
@@ -1073,19 +1094,28 @@
if (ac == 1) {
ps_module *tempmod;
+ if (PS(session_status) & (PS_ACTIVE|PS_ERROR)) {
+ efree(old);
+ php_error(E_NOTICE, "%s() cannot set session module name once
+session is started. "
+ "Current session save handler (%s)",
+ get_active_function_name(TSRMLS_C),
+ (PS(mod)->name ? PS(mod)->name : "none"));
+ RETURN_FALSE;
+ }
+
convert_to_string_ex(p_name);
tempmod = _php_find_ps_module(Z_STRVAL_PP(p_name) TSRMLS_CC);
- if (tempmod) {
- if (PS(mod_data))
- PS(mod)->close(&PS(mod_data));
- PS(mod) = tempmod;
- PS(mod_data) = NULL;
- } else {
+ if (!tempmod) {
efree(old);
- php_error(E_ERROR, "Cannot find named PHP session module (%s)",
- Z_STRVAL_PP(p_name));
+ php_error(E_NOTICE, "Cannot find named PHP session module
+(%s)",
+ Z_STRVAL_PP(p_name));
RETURN_FALSE;
}
+ if (PS(mod_data))
+ PS(mod)->close(&PS(mod_data));
+ PS(mod) = tempmod;
+ PS(mod_data) = NULL;
+ PS(rinit_mod) = 1;
}
RETVAL_STRING(old, 0);
@@ -1103,8 +1133,13 @@
if (ZEND_NUM_ARGS() != 6 || zend_get_parameters_array_ex(6, args) == FAILURE)
WRONG_PARAM_COUNT;
- if (PS(session_status) != php_session_none)
+ if (PS(session_status) & PS_ACTIVE) {
+ php_error(E_NOTICE, "%s() cannot set session save handler functions
+once session is started. "
+ "Current session save handler (%s)",
+ get_active_function_name(TSRMLS_C),
+ (PS(mod)->name ? PS(mod)->name : "none"));
RETURN_FALSE;
+ }
zend_alter_ini_entry("session.save_handler", sizeof("session.save_handler"),
"user", sizeof("user")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
@@ -1133,8 +1168,14 @@
if (ac < 0 || ac > 1 || zend_get_parameters_ex(ac, &p_name) == FAILURE)
WRONG_PARAM_COUNT;
-
+
if (ac == 1) {
+ if (PS(session_status) & PS_ACTIVE) {
+ efree(old);
+ php_error(E_NOTICE, "%s() cannot change session save path
+once session is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
convert_to_string_ex(p_name);
zend_alter_ini_entry("session.save_path", sizeof("session.save_path"),
Z_STRVAL_PP(p_name), Z_STRLEN_PP(p_name), PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
}
@@ -1156,10 +1197,16 @@
if (ac < 0 || ac > 1 || zend_get_parameters_ex(ac, &p_name) == FAILURE)
WRONG_PARAM_COUNT;
-
+
if (ac == 1) {
- convert_to_string_ex(p_name);
if (PS(id)) efree(PS(id));
+ if (PS(session_status) & PS_ACTIVE) {
+ efree(old);
+ php_error(E_NOTICE, "%s() cannot set session id once session
+is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
+ convert_to_string_ex(p_name);
PS(id) = estrndup(Z_STRVAL_PP(p_name), Z_STRLEN_PP(p_name));
}
@@ -1181,6 +1228,13 @@
WRONG_PARAM_COUNT;
if (ac == 1) {
+ if (PS(session_status) & (PS_ACTIVE|PS_ERROR)) {
+ efree(old);
+ php_error(E_NOTICE, "%s() cannot set session module name once
+session is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
+
convert_to_string_ex(p_cache_limiter);
zend_alter_ini_entry("session.cache_limiter",
sizeof("session.cache_limiter"), Z_STRVAL_PP(p_cache_limiter),
Z_STRLEN_PP(p_cache_limiter), PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
}
@@ -1252,7 +1306,7 @@
WRONG_PARAM_COUNT;
}
- if (PS(session_status) == php_session_none)
+ if (PS(session_status) & PS_NONE)
php_session_start(TSRMLS_C);
for (i = 0; i < argc; i++) {
@@ -1276,7 +1330,13 @@
if (ac != 1 || zend_get_parameters_ex(ac, &p_name) == FAILURE)
WRONG_PARAM_COUNT;
-
+
+ if (!(PS(session_status) & PS_ACTIVE)) {
+ php_error(E_NOTICE, "%s() cannot be used unless session is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
+
convert_to_string_ex(p_name);
PS_DEL_VARL(Z_STRVAL_PP(p_name), Z_STRLEN_PP(p_name));
@@ -1296,6 +1356,12 @@
if (ac != 1 || zend_get_parameters_ex(ac, &p_name) == FAILURE)
WRONG_PARAM_COUNT;
+ if (!(PS(session_status) & PS_ACTIVE)) {
+ php_error(E_NOTICE, "%s() cannot be used unless session is started.",
+ get_active_function_name(TSRMLS_C));
+ RETURN_FALSE;
+ }
+
convert_to_string_ex(p_name);
if (zend_hash_find(&PS(vars), Z_STRVAL_PP(p_name),
@@ -1372,7 +1438,7 @@
char *variable;
ulong num_key;
- if (PS(session_status) == php_session_none)
+ if (PS(session_status) & PS_NONE)
RETURN_FALSE;
if (PG(register_globals)) {
@@ -1393,7 +1459,7 @@
PHPAPI void session_adapt_url(const char *url, size_t urllen, char **new, size_t
*newlen TSRMLS_DC)
{
- if (PS(apply_trans_sid) && (PS(session_status) == php_session_active)) {
+ if (PS(apply_trans_sid) && (PS(session_status) & PS_ACTIVE)) {
*new = url_adapt_single_url(url, urllen, PS(session_name), PS(id),
newlen TSRMLS_CC);
}
}
@@ -1403,7 +1469,7 @@
{
zend_hash_init(&PS(vars), 0, NULL, NULL, 0);
PS(id) = NULL;
- PS(session_status) = php_session_none;
+ PS(session_status) = PS_NONE;
PS(mod_data) = NULL;
PS(output_handler_registered) = 0;
}
@@ -1424,8 +1490,9 @@
{
php_rinit_session_globals(TSRMLS_C);
- if (PS(mod) == NULL) {
+ if (PS(mod) == NULL || PS(rinit_mod)) {
char *value;
+ PS(rinit_mod) = 0;
value = zend_ini_string("session.save_handler",
sizeof("session.save_handler"), 0);
if (value) {
@@ -1434,7 +1501,7 @@
if (!PS(mod)) {
/* current status is unusable */
- PS(session_status) = php_session_disabled;
+ PS(session_status) = PS_DISABLED;
return SUCCESS;
}
}
@@ -1448,9 +1515,9 @@
static void php_session_flush(TSRMLS_D)
{
- if(PS(session_status)==php_session_active) {
+ if(PS(session_status) & PS_ACTIVE) {
php_session_save_current_state(TSRMLS_C);
- PS(session_status)=php_session_none;
+ PS(session_status) = PS_DISABLED;
}
}
@@ -1468,6 +1535,7 @@
}
php_session_flush(TSRMLS_C);
php_rshutdown_session_globals(TSRMLS_C);
+ PS(session_status) = PS_DISABLED;
return SUCCESS;
}
/* }}} */
--
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