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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=15914 shmget returns EEXIST Summary: shmget returns EEXIST Product: Apache httpd-2.0 Version: 2.0.43 Platform: Other OS/Version: Linux Status: NEW Severity: Normal Priority: Other Component: Platform AssignedTo: bugs@httpd.apache.org ReportedBy: [EMAIL PROTECTED] The following code in the file srclib/apr/shmem/unix/shm.c status = apr_file_open(&file, filename, APR_WRITE | APR_CREATE | APR_EXCL, APR_OS_DEFAULT, pool); if (status != APR_SUCCESS) { return status; } /* ftok() (on solaris at least) requires that the file actually * exist before calling ftok(). */ shmkey = ftok(filename, 1); if (shmkey == (key_t)-1) { return errno; } if ((new_m->shmid = shmget(shmkey, new_m->realsize, SHM_R | SHM_W | IPC_CREAT | IPC_EXCL)) < 0) { return errno; } Results in the folowing systrace: [pid 3806] unlink("/var/adm/httpd/httpd.scoreboard") = 0 [pid 3806] open("/var/adm/httpd/httpd.scoreboard", O_WRONLY|O_CREAT|O_EXCL, 0666) = 9 [pid 3806] stat64("/var/adm/httpd/httpd.scoreboard", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 [pid 3806] shmget(16908467, 209176, IPC_CREAT|IPC_EXCL|0x180|0600) = -1 EEXIST (File exists) Quite obviously, creating a file exlusively will fail if tried twice. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]