ID: 9639 Updated by: sniper Reported By: [EMAIL PROTECTED] Old-Status: Open Status: Feedback Bug Type: *Session related Operating system: PHP Version: 4.0.4pl1 Assigned To: Comments: Does this still happen with PHP 4.0.6RC3: http://www.php.net/~andi/php-4.0.6RC3.tar.gz If above link does not work, change RC3 to RC4. --Jani Previous Comments: --------------------------------------------------------------------------- [2001-03-08 17:10:21] [EMAIL PROTECTED] On RedHat 6.2 or 7 machine with more than 67M of shared memory available per process (this number is stored in /proc/sys/kernel/shmmax) Compile Apache with ssl modules. Compile mod_php into Apache --with-mm Have 33000000 ( or anything less than 67M) in /proc/sys/kernel/shmmax on machine where you're running Apache -> CGI POST stops working, stdin is empty. This happens regardless of what kind of cgi script is executted by the form, it doesn't have to be a php script. Increase the number in /proc/sys/kernel/shmmax to something more than 67M, everything works again. This 67M number is hardcoded in mm_create from mm library by their configure script, which checks how much memory is available. I have no explanation for it, because all mod_mm does in this case is returning FAILURE if there is not enough memory. Go figure... Here is my proposal: lets check how much memory is there before calling mm_create in mod_mm.c by doing this: (I put the actual patch at the bottom) Add two new functions ( pretty much copied from mm configure) static int test_mem_size (unsigned long size) { int fd; void *segment; #ifdef MM_SHMT_MMFILE char file[] = "./ac_test.tmp"; unlink(file); if ((fd = open(file, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) == -1) return 0; if (ftruncate(fd, size) == -1) return 0; if ((segment = (void *)mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) { close(fd); return 0; } munmap((caddr_t)segment, size); close(fd); unlink(file); #endif #ifdef MM_SHMT_IPCSHM if ((fd = shmget(IPC_PRIVATE, size, SHM_R|SHM_W|IPC_CREAT)) == -1) return 0; if ((segment = (void *)shmat(fd, NULL, 0)) == ((void *)-1)) { shmctl(fd, IPC_RMID, NULL); return 0; } shmdt(segment); shmctl(fd, IPC_RMID, NULL); #endif return 1; } #define ABS(n) ((n) >= 0 ? (n) : (-(n))) static unsigned long get_max_mem_size() { unsigned long t, m, b; int d; int rc; /* * Find maximum possible allocation size by performing a * binary search starting with a search space between 0 and * 64MB of memory. */ t = 1024*1024*64 /* = 67108864 */; if (test_mem_size(t)) m = t; else { m = 1024*1024*32; b = 0; for (;;) { /* fprintf(stderr, "t=%d, m=%d, b=%dn", t, m, b); */ rc = test_mem_size(m); if (rc) { d = ((t-m)/2); b = m; } else { d = -((m-b)/2); t = m; } if (ABS(d) < 1024*1) { if (!rc) m = b; break; } if (m < 1024*8) break; m += d; } if (m < 1024*8) m = 0; } return m; } The actual patch would look like this: --- ext/session/mod_mm.c Fri Nov 3 07:00:49 2000 +++ ext/session/mod_mm.c Tue Feb 27 14:09:31 2001 @@ -173,9 +173,84 @@ #define PS_MM_DATA ps_mm *data = PS_GET_MOD_DATA() +static int test_mem_size (unsigned long size) +{ + int fd; + void *segment; +#ifdef MM_SHMT_MMFILE + char file[] = "./ac_test.tmp"; + unlink(file); + if ((fd = open(file, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) == -1) + return 0; + if (ftruncate(fd, size) == -1) + return 0; + if ((segment = (void *)mmap(NULL, size, PROT_READ|PROT_WRITE, + MAP_SHARED, fd, 0)) == MAP_FAILED) { + close(fd); + return 0; + } + munmap((caddr_t)segment, size); + close(fd); + unlink(file); +#endif +#ifdef MM_SHMT_IPCSHM + if ((fd = shmget(IPC_PRIVATE, size, SHM_R|SHM_W|IPC_CREAT)) == -1) + return 0; + if ((segment = (void *)shmat(fd, NULL, 0)) == ((void *)-1)) { + shmctl(fd, IPC_RMID, NULL); + return 0; + } + shmdt(segment); + shmctl(fd, IPC_RMID, NULL); +#endif + return 1; +} +#define ABS(n) ((n) >= 0 ? (n) : (-(n))) +static unsigned long get_max_mem_size() +{ + unsigned long t, m, b; + int d; + int rc; + /* + * Find maximum possible allocation size by performing a + * binary search starting with a search space between 0 and + * 64MB of memory. + */ + t = 1024*1024*64 /* = 67108864 */; + if (test_mem_size(t)) + m = t; + else { + m = 1024*1024*32; + b = 0; + for (;;) { + /* fprintf(stderr, "t=%d, m=%d, b=%dn", t, m, b); */ + rc = test_mem_size(m); + if (rc) { + d = ((t-m)/2); + b = m; + } + else { + d = -((m-b)/2); + t = m; + } + if (ABS(d) < 1024*1) { + if (!rc) + m = b; + break; + } + if (m < 1024*8) + break; + m += d; + } + if (m < 1024*8) + m = 0; + } + return m; +} static int ps_mm_initialize(ps_mm *data, const char *path) { - data->mm = mm_create(0, path); + unsigned long m = get_max_mem_size(); + data->mm = mm_create(m, path); if (!data->mm) { return FAILURE; --------------------------------------------------------------------------- ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=9639&edit=2 -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
