+/* $Cambridge: exim/src/OS/os.c-cygwin,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */
+
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Cygwin-specific code. December 2002
+ This is concatenated onto the generic src/os.c file.
+
+ This code was supplied by Pierre A. Humblet <Pierre.Humblet@ieee.org>
+*/
+
+/* We need a special mkdir that
+ allows names starting with // */
+#undef mkdir
+int cygwin_mkdir( const char *path, mode_t mode )
+{
+ const char * p = path;
+ if (*p == '/') while(*(p+1) == '/') p++;
+ return mkdir(p, mode);
+}
+
+/* We have strsignal but cannot use #define
+ because types don't match */
+#define OS_STRSIGNAL /* src/os.c need not provide it */
+char * os_strsignal(int sig)
+{
+ return (char *) strsignal(sig);
+}
+
+#ifndef COMPILE_UTILITY /* Utilities don't need special code */
+#ifdef INCLUDE_MINIRES
+#include "../minires/minires.c"
+#include "../minires/os-interface.c"
+#endif
+
+#ifdef INCLUDE_PAM
+#include "../pam/pam.c"
+#endif
+
+unsigned int cygwin_WinVersion;
+
+/* Conflict between Windows definitions and others */
+#ifdef NOERROR
+#undef NOERROR
+#endif
+#ifdef DELETE
+#undef DELETE
+#endif
+
+#include <windows.h>
+#include <sys/cygwin.h>
+
+/* Special static variables */
+static BOOL cygwin_debug = FALSE;
+static int privileged = 1; /* when not privileged, setuid = noop */
+
+#undef setuid
+int cygwin_setuid(uid_t uid )
+{
+ int res;
+ if (privileged <= 0) return 0;
+ else {
+ res = setuid(uid);
+ if (cygwin_debug)
+ fprintf(stderr, "setuid %lu %lu %d pid: %d\n",
+ uid, getuid(),res, getpid());
+ }
+ return res;
+}
+
+#undef setgid
+int cygwin_setgid(gid_t gid )
+{
+ int res;
+ if (privileged <= 0) return 0;
+ else {
+ res = setgid(gid);
+ if (cygwin_debug)
+ fprintf(stderr, "setgid %lu %lu %d pid: %d\n",
+ gid, getgid(), res, getpid());
+ }
+ return res;
+}
+
+/* Background processes run at lower priority */
+static void setpriority()
+{
+ if (!SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS))
+ SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS);
+ return;
+}
+
+
+/* GetVersion()
+ MSB: 1 for 95/98/ME; Next 7: build number, except for 95/98/ME
+ Next byte: 0
+ Next byte: minor version of OS
+ Low byte: major version of OS (3 or 4 for for NT, 5 for 2000 and XP) */
+#define VERSION_IS_58M(x) (x & 0x80000000) /* 95, 98, Me */
+#define VERSION_IS_NT(x) ((x & 0XFF) < 5) /* NT 4 or 3.51 */
+
+/*
+ Routine to find if process or thread is privileged
+*/
+
+enum {
+ CREATE_BIT = 1,
+ RESTORE_BIT = 2
+};
+
+static DWORD get_privileges ()
+{
+ char buffer[1024];
+ DWORD i, length;
+ HANDLE hToken = NULL;
+ PTOKEN_PRIVILEGES privs;
+ LUID cluid, rluid;
+ DWORD ret = 0;
+
+ privs = (PTOKEN_PRIVILEGES) buffer;
+
+ if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken)
+ && LookupPrivilegeValue (NULL, SE_CREATE_TOKEN_NAME, &cluid)
+ && LookupPrivilegeValue(NULL, SE_RESTORE_NAME, &rluid)
+ && (GetTokenInformation( hToken, TokenPrivileges,
+ privs, sizeof (buffer), &length)
+ || (GetLastError () == ERROR_INSUFFICIENT_BUFFER
+ && (privs = (PTOKEN_PRIVILEGES) alloca (length))
+ && GetTokenInformation(hToken, TokenPrivileges,
+ privs, length, &length)))) {
+ for (i = 0; i < privs->PrivilegeCount; i++) {
+ if (privs->Privileges[i].Luid.QuadPart == cluid.QuadPart)
+ ret |= CREATE_BIT;
+ else if (privs->Privileges[i].Luid.QuadPart == rluid.QuadPart)
+ ret |= RESTORE_BIT;
+ else continue;
+ if (ret == (CREATE_BIT | RESTORE_BIT))
+ break;
+ }
+ }
+ else
+ fprintf(stderr, "has_create_token_privilege %ld\n", GetLastError());
+
+ if (hToken)
+ CloseHandle(hToken);
+
+ return ret;
+}
+
+/* We use a special routine to initialize
+ cygwin_init is called from the OS_INIT macro in main(). */
+
+void cygwin_init(int argc, char ** argv, void * rup,
+ void * eup, void * egp, void * cup)
+{
+ int i;
+ uid_t myuid, systemuid;
+ gid_t mygid, adminsgid;
+ struct passwd * pwp;
+ char *cygenv, win32_path[MAX_PATH];
+ SID(1, SystemSid, SECURITY_LOCAL_SYSTEM_RID);
+ SID(2, AdminsSid, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS);
+ DWORD priv_flags;
+
+ myuid = getuid();
+ mygid = getgid();
+ cygwin_WinVersion = GetVersion();
+ if ((cygenv = getenv("CYGWIN")) == NULL) cygenv = "";
+ /* Produce some debugging on stderr,
+ cannot yet use exim's debug functions.
+ Exim does not use -c and ignores -n.
+ Set lower priority for daemons */
+ for (i = 1; i < argc; i++) {
+ if (argv[i][0] == '-') {
+ if (argv[i][1] == 'c') {
+ argv[i][1] = 'n'; /* Replace -c by -n */
+ cygwin_debug = TRUE;
+ fprintf(stderr, "CYGWIN = \"%s\".", cygenv);
+ cygwin_conv_to_win32_path("/", win32_path);
+ fprintf(stderr, " Root / mapped to %s.\n", win32_path);
+ }
+ else if (argv[i][1] == 'b' && argv[i][2] == 'd')
+ setpriority();
+ }
+ }
+ if (VERSION_IS_58M(cygwin_WinVersion)) {
+ * (uid_t *) rup = myuid; /* Pretend we are root */
+ * (uid_t *) eup = myuid; /* ... and exim */
+ * (gid_t *) egp = mygid;
+ return;
+ }
+ /* Nt/2000/XP
+ We initially set the exim uid & gid to those of the "real exim",
+ or to the root uid (SYSTEM) and exim gid (ADMINS),
+ If privileged, we setuid to those.
+ We always set the configure uid to the system uid.
+ We always set the root uid to the real uid
+ to avoid useless execs following forks.
+ If not privileged and unable to chown,
+ we set the exim uid to our uid.
+ If unprivileged, we fake all subsequent setuid. */
+
+ priv_flags = get_privileges ();
+ privileged = !!(priv_flags & CREATE_BIT);
+
+ /* Get the system and admins uid from their sids,
+ or use the default values from the Makefile. */
+ if ((systemuid = cygwin_internal(CW_GET_UID_FROM_SID, & SystemSid)) == -1)
+ systemuid = * (uid_t *) eup;
+ if ((adminsgid = cygwin_internal(CW_GET_GID_FROM_SID, & AdminsSid)) == -1)
+ adminsgid = * (gid_t *) egp;
+
+ if ((pwp = getpwnam("exim")) != NULL) {
+ * (uid_t *) eup = pwp->pw_uid; /* Set it according to passwd */
+ * (gid_t *) egp = pwp->pw_gid;
+ }
+ else {
+ * (uid_t *) eup = systemuid;
+ * (gid_t *) egp = adminsgid;
+ }
+
+ /* Set the configuration uid to the system uid.
+ Note that exim uid is also accepted as owner of exim.conf. */
+ * (uid_t *) cup = systemuid;
+
+ if (privileged) { /* Can setuid */
+ if (cygwin_setgid(* (gid_t *) egp) /* Setuid to exim */
+ || cygwin_setuid(* (uid_t *) eup))
+ privileged = -1; /* Problem... Perhaps not in 544 */
+ }
+
+ /* Pretend we are root to avoid useless execs.
+ We are limited by file access rights */
+ * (uid_t *) rup = getuid ();
+
+ /* If we have not setuid to exim and cannot chown,
+ set the exim uid to our uid to avoid chown failures */
+ if (privileged <= 0 && !(priv_flags & RESTORE_BIT))
+ * (uid_t *) eup = * (uid_t *) rup;
+
+ if (cygwin_debug) {
+ fprintf(stderr, "Starting uid %ld, gid %ld, ntsec %lu, privileged %d.\n",
+ myuid, mygid, cygwin_internal(CW_CHECK_NTSEC, NULL), privileged);
+ fprintf(stderr, "root_uid %ld, exim_uid %ld, exim_gid %ld, config_uid %ld.\n",
+ * (uid_t *) rup, * (uid_t *) eup, * (gid_t *) egp, * (uid_t *) cup);
+ }
+ return;
+}
+
+/*****************************************************************
+ *
+ Functions for average load measurements
+
+ Obtaining statistics in Windows is done at a low level by
+ calling registry functions, in particular the key
+ HKEY_PERFORMANCE_DATA on NT and successors.
+ Something equivalent exists on Win95, see Microsoft article
+ HOWTO: Access the Performance Registry Under Windows 95 (Q174631)
+ but it is not implemented here.
+
+ The list of objects to be polled is specified in the string
+ passed to RegQueryValueEx in ReadStat() below.
+ On NT, all objects are polled even if info about only one is
+ required. This is fixed in Windows 2000. See articles
+ INFO: Perflib Calling Close Procedure in Windows 2000 (Q270127)
+ INFO: Performance Data Changes Between Windows NT 4.0 and Windows
+ 2000 (Q296523)
+
+ It is unclear to me how the counters are primarily identified.
+ Whether it's by name strings or by the offset of their strings
+ as mapped in X:\Winnt\system32\perfc009.dat [or equivalently as
+ reported by the registry functions in GetNameStrings( ) below].
+ Microsoft documentation seems to say that both methods should
+ work.
+
+ In the interest of speed and language independence, the main
+ code below relies on offsets. However if debug is enabled, the
+ code verifies that the names of the corresponding strings are
+ as expected.
+
+*****************************************************************/
+#ifndef OS_LOAD_AVERAGE /* Can be set on command line */
+#define OS_LOAD_AVERAGE /* src/os.c need not provide it */
+
+/* Object and counter indices and names */
+#define PROCESSOR_OBJECT_INDEX 238
+#define PROCESSOR_OBJECT_STRING "238"
+#define PROCESSOR_OBJECT_NAME "Processor"
+#define PROCESSOR_TIME_COUNTER 6
+#define PROCESSOR_TIME_NAME "% Processor Time"
+
+/* Structure to compute the load average efficiently */
+static struct {
+ long long Time100ns; /* Last measurement time */
+ long long IdleCount; /* Latest cumulative idle time */
+ long long LastCounter; /* Last measurement counter */
+ long long PerfFreq; /* Perf counter frequency */
+ PPERF_DATA_BLOCK PerfData; /* Pointer to a buffer to get the data */
+ DWORD BufferSize; /* Size of PerfData */
+ int LastLoad; /* Last reported load, or -1 */
+ LPSTR * NamesArray; /* Temporary (malloc) buffer for index */
+ BOOL Init; /* True if initialized */
+} cygwin_load = { 0, 0, 0, 0, NULL, 0, 0, NULL, FALSE};
+
+#define BYTEINCREMENT 800 /* Block to add to PerfData */
+
+/*****************************************************************
+ *
+ Macros to navigate through the performance data.
+
+ *****************************************************************/
+#define FirstObject(PerfData)\
+ ((PPERF_OBJECT_TYPE)((PBYTE)PerfData + PerfData->HeaderLength))
+#define NextObject(PerfObj)\
+ ((PPERF_OBJECT_TYPE)((PBYTE)PerfObj + PerfObj->TotalByteLength))
+#define ObjectCounterBlock(PerfObj)\
+ ((PPERF_COUNTER_BLOCK)(PBYTE)PerfObj + PerfObj->DefinitionLength )
+#define FirstInstance(PerfObj )\
+ ((PPERF_INSTANCE_DEFINITION)((PBYTE)PerfObj + PerfObj->DefinitionLength))
+#define InstanceCounterBlock(PerfInst)\
+ ((PPERF_COUNTER_BLOCK) ((PBYTE)PerfInst + PerfInst->ByteLength ))
+#define NextInstance(PerfInst )\
+ ((PPERF_INSTANCE_DEFINITION)((PBYTE)InstanceCounterBlock(PerfInst) + \
+ InstanceCounterBlock(PerfInst)->ByteLength) )
+#define FirstCounter(PerfObj)\
+ ((PPERF_COUNTER_DEFINITION) ((PBYTE)PerfObj + PerfObj->HeaderLength))
+#define NextCounter(PerfCntr)\
+ ((PPERF_COUNTER_DEFINITION)((PBYTE)PerfCntr + PerfCntr->ByteLength))
+
+/*****************************************************************
+ *
+ Load the counter and object names from the registry
+ to cygwin_load.NameStrings
+ and index them in cygwin_load.NamesArray
+
+ NameStrings seems to be taken from the file
+ X:\Winnt\system32\perfc009.dat
+
+ This is used only for name verification during initialization,
+ if DEBUG(D_load) is TRUE.
+
+*****************************************************************/
+static BOOL GetNameStrings( )
+{
+ HKEY hKeyPerflib; // handle to registry key
+ DWORD dwArraySize; // size for array
+ DWORD dwNamesSize; // size for strings
+ LPSTR lpCurrentString; // pointer for enumerating data strings
+ DWORD dwCounter; // current counter index
+ LONG res;
+
+ /* Get the number of Counter items into dwArraySize. */
+ if ((res = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
+ "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib",
+ 0,
+ KEY_QUERY_VALUE, /* KEY_READ, */
+ &hKeyPerflib))
+ != ERROR_SUCCESS) {
+ DEBUG(D_load) debug_printf("RegOpenKeyEx (1): error %ld (Windows)\n", res);
+ return FALSE;
+ }
+ dwNamesSize = sizeof(dwArraySize); /* Temporary reuse */
+ if ((res = RegQueryValueEx( hKeyPerflib,
+ "Last Counter",
+ NULL,
+ NULL,
+ (LPBYTE) &dwArraySize,
+ &dwNamesSize ))
+ != ERROR_SUCCESS) {
+ DEBUG(D_load) debug_printf("RegQueryValueEx (1): error %ld (Windows)\n", res);
+ return FALSE;
+ }
+ RegCloseKey( hKeyPerflib );
+ /* Open the key containing the counter and object names. */
+ if ((res = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
+ "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib\\009",
+ 0,
+ KEY_READ,
+ &hKeyPerflib))
+ != ERROR_SUCCESS) {
+ DEBUG(D_load) debug_printf("RegOpenKeyEx (2): error %ld (Windows)\n", res);
+ return FALSE;
+ }
+ /* Get the size of the Counter value in the key
+ and then read the value in the tail of NamesArray */
+ dwNamesSize = 0;
+ lpCurrentString = NULL;
+ while (1) {
+ res = RegQueryValueEx( hKeyPerflib,
+ "Counter",
+ NULL,
+ NULL,
+ (unsigned char *) lpCurrentString,
+ &dwNamesSize);
+ if ((res == ERROR_SUCCESS) && /* Bug (NT 4.0): SUCCESS was returned on first call */
+ (cygwin_load.NamesArray != NULL)) break;
+ if ((res == ERROR_SUCCESS) || /* but cygwin_load.NamesArrays == NULL */
+ (res == ERROR_MORE_DATA)) {
+ /* Allocate memory BOTH for the names array and for the counter and object names */
+ if ((cygwin_load.NamesArray =
+ (LPSTR *) malloc( (dwArraySize + 1) * sizeof(LPSTR) + dwNamesSize * sizeof(CHAR)))
+ != NULL) {
+ /* Point to area for the counter and object names */
+ lpCurrentString = (LPSTR) & cygwin_load.NamesArray[dwArraySize + 1];
+ continue;
+ }
+ DEBUG(D_load) debug_printf("Malloc: errno %d (%s)\n", errno, strerror(errno));
+ }
+ else { /* Serious error */
+ DEBUG(D_load) debug_printf("RegQueryValueEx (2): error %ld (Windows)\n", res);
+ }
+ return FALSE;
+ }
+ RegCloseKey( hKeyPerflib );
+ /* Index the names into an array. */
+ while (*lpCurrentString) {
+ dwCounter = atol( lpCurrentString );
+ lpCurrentString += (lstrlen(lpCurrentString)+1);
+ cygwin_load.NamesArray[dwCounter] = lpCurrentString;
+ lpCurrentString += (strlen(lpCurrentString)+1);
+ }
+ return TRUE;
+}
+
+/*****************************************************************
+ *
+ Find the value of the Processor Time counter
+
+*****************************************************************/
+static BOOL ReadTimeCtr(PPERF_OBJECT_TYPE PerfObj,
+ PPERF_COUNTER_DEFINITION CurCntr,
+ PPERF_COUNTER_BLOCK PtrToCntr,
+ unsigned long long * TimePtr){
+ int j;
+ /* Scan all counters. */
+ for( j = 0; j < PerfObj->NumCounters; j++ ) {
+ if (CurCntr->CounterNameTitleIndex == PROCESSOR_TIME_COUNTER) {
+ /* Verify it is really the proc time counter */
+ if ((CurCntr->CounterType != PERF_100NSEC_TIMER_INV) || /* Wrong type */
+ ((cygwin_load.NamesArray != NULL) && /* Verify name */
+ (strcmp(cygwin_load.NamesArray[CurCntr->CounterNameTitleIndex],
+ PROCESSOR_TIME_NAME)))) {
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "Incorrect Perf counter type or name %x %s",
+ (unsigned) CurCntr->CounterType,
+ cygwin_load.NamesArray[CurCntr->CounterNameTitleIndex]);
+ return FALSE;
+ }
+ *TimePtr += *(unsigned long long int *) ((PBYTE) PtrToCntr + CurCntr->CounterOffset);
+ return TRUE; /* return TRUE as soon as we found the counter */
+ }
+ /* Get the next counter. */
+ CurCntr = NextCounter( CurCntr );
+ }
+ return FALSE;
+}
+/*****************************************************************
+ *
+ ReadStat()
+ Measures current Time100ns and IdleCount
+ Return TRUE if success.
+
+ *****************************************************************/
+static BOOL ReadStat(long long int *Time100nsPtr,
+ long long int * IdleCountPtr)
+{
+ PPERF_OBJECT_TYPE PerfObj;
+ PPERF_INSTANCE_DEFINITION PerfInst;
+ PPERF_COUNTER_DEFINITION PerfCntr;
+ PPERF_COUNTER_BLOCK PtrToCntr;
+ DWORD i, k, res;
+
+ /* Get the performance data for the Processor object
+ There is no need to open a key.
+ We may need to blindly increase the buffer size.
+ BufferSize does not return info but may be changed */
+ while (1) {
+ DWORD BufferSize = cygwin_load.BufferSize;
+ res = RegQueryValueEx( HKEY_PERFORMANCE_DATA,
+ PROCESSOR_OBJECT_STRING,
+ NULL,
+ NULL,
+ (LPBYTE) cygwin_load.PerfData,
+ &BufferSize );
+ if (res == ERROR_SUCCESS) break;
+ if (res == ERROR_MORE_DATA ) {
+ /* Increment if necessary to get a buffer that is big enough. */
+ cygwin_load.BufferSize += BYTEINCREMENT;
+ if ((cygwin_load.PerfData =
+ (PPERF_DATA_BLOCK) realloc( cygwin_load.PerfData, cygwin_load.BufferSize ))
+ != NULL) continue;
+ DEBUG(D_load) debug_printf("Malloc: errno %d (%s)\n", errno, strerror(errno));
+ }
+ else { /* Serious error */
+ DEBUG(D_load) debug_printf("RegQueryValueEx (3): error %ld (Windows)\n", res);
+ }
+ return FALSE;
+ }
+ /* Initialize the counters */
+ *Time100nsPtr = 0;
+ *IdleCountPtr = 0;
+ /* We should only have one object, but write general code just in case. */
+ PerfObj = FirstObject( cygwin_load.PerfData );
+ for( i = 0; i < cygwin_load.PerfData->NumObjectTypes; i++ ) {
+ /* We are only interested in the processor object */
+ if ( PerfObj->ObjectNameTitleIndex == PROCESSOR_OBJECT_INDEX) {
+ /* Possibly verify it is really the Processor object. */
+ if ((cygwin_load.NamesArray != NULL) &&
+ (strcmp(cygwin_load.NamesArray[PerfObj->ObjectNameTitleIndex],
+ PROCESSOR_OBJECT_NAME))) {
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "Incorrect Perf object name %s",
+ cygwin_load.NamesArray[PerfObj->ObjectNameTitleIndex]);
+ return FALSE;
+ }
+ /* Get the first counter */
+ PerfCntr = FirstCounter( PerfObj );
+ /* See if the object has instances.
+ It should, but write general code. */
+ if( PerfObj->NumInstances != PERF_NO_INSTANCES ) {
+ PerfInst = FirstInstance( PerfObj );
+ for( k = 0; k < PerfObj->NumInstances; k++ ) {
+ /* There can be several processors.
+ Accumulate both the Time100ns and the idle counter.
+ On Win 2000 I have seen an instance named "_Total".
+ Do not use it. We only use instances with a single
+ character in the name.
+ If we examine the object names, we also look at the instance
+ names and their lengths and issue reports */
+ if ( cygwin_load.NamesArray != NULL) {
+ CHAR ascii[30]; /* The name is in unicode */
+ wsprintf(ascii,"%.29lS",
+ (char *)((PBYTE)PerfInst + PerfInst->NameOffset));
+ log_write(0, LOG_MAIN,
+ "Perf: Found processor instance \"%s\", length %d",
+ ascii, PerfInst->NameLength);
+ if ((PerfInst->NameLength != 4) &&
+ (strcmp(ascii, "_Total") != 0)) {
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "Perf: WARNING: Unexpected processor instance name");
+ return FALSE;
+ }
+ }
+ if (PerfInst->NameLength == 4) {
+ *Time100nsPtr += cygwin_load.PerfData->PerfTime100nSec.QuadPart;
+ PtrToCntr = InstanceCounterBlock(PerfInst);
+ if (! ReadTimeCtr(PerfObj, PerfCntr, PtrToCntr, IdleCountPtr)) {
+ return FALSE;
+ }
+ }
+ PerfInst = NextInstance( PerfInst );
+ }
+ return (*Time100nsPtr != 0); /* Something was read */
+ }
+ else { /* No instance, just the counter data */
+ *Time100nsPtr = cygwin_load.PerfData->PerfTime100nSec.QuadPart;
+ PtrToCntr = ObjectCounterBlock(PerfObj);
+ return ReadTimeCtr(PerfObj, PerfCntr, PtrToCntr, IdleCountPtr);
+ }
+ }
+ PerfObj = NextObject( PerfObj );
+ }
+ return FALSE; /* Did not find the Processor object */
+}
+
+/*****************************************************************
+ *
+ InitLoadAvg()
+ Initialize the cygwin_load structure.
+ and set cygwin_load.Flag to TRUE if successful.
+ This is called the first time os_getloadavg is called
+ *****************************************************************/
+static void InitLoadAvg()
+{
+ BOOL success = TRUE;
+ cygwin_load.Init = TRUE; /* We have run */
+ /* Get perf frequency and counter */
+ QueryPerformanceFrequency((LARGE_INTEGER *)& cygwin_load.PerfFreq);
+ QueryPerformanceCounter((LARGE_INTEGER *)& cygwin_load.LastCounter);
+ DEBUG(D_load) {
+ /* Get the name strings through the registry
+ to verify that the object and counter numbers
+ have the names we expect */
+ success = GetNameStrings();
+ }
+ /* Get initial values for Time100ns and IdleCount
+ and possibly verify the names */
+ // success = success &&
+ success = ReadStat( & cygwin_load.Time100ns,
+ & cygwin_load.IdleCount);
+ /* If success, set the Load to 0, else to -1 */
+ if (success) cygwin_load.LastLoad = 0;
+ else {
+ log_write(0, LOG_MAIN, "Cannot obtain Load Average");
+ cygwin_load.LastLoad = -1;
+ }
+ /* Free the buffer created for debug name verification */
+ if (cygwin_load.NamesArray != NULL) {
+ free(cygwin_load.NamesArray);
+ cygwin_load.NamesArray = NULL;
+ }
+}
+/*****************************************************************
+ *
+ os_getloadavg()
+
+ Return -1 if not available;
+ Return the previous value if less than AVERAGING sec old.
+ else return the processor load on a [0 - 1000] scale.
+
+ The first time we are called we initialize the counts
+ and return 0 or -1.
+ The load cannot be measured because we use the processor 100%
+*****************************************************************/
+#define AVERAGING 10
+int os_getloadavg()
+{
+ long long Time100ns, IdleCount, CurrCounter;
+ int value;
+
+ if (! cygwin_load.Init) InitLoadAvg();
+ else if (cygwin_load.LastLoad >= 0) { /* Initialized OK */
+ /* Get the current time (PerfCounter) */
+ QueryPerformanceCounter((LARGE_INTEGER *)& CurrCounter);
+ /* Calls closer than AVERAGING sec apart use the previous value */
+ if (CurrCounter - cygwin_load.LastCounter >
+ AVERAGING * cygwin_load.PerfFreq) {
+ /* Get Time100ns and IdleCount */
+ if (ReadStat( & Time100ns, & IdleCount)) { /* Success */
+ /* Return processor load on 1000 scale */
+ value = 1000 - ((1000 * (IdleCount - cygwin_load.IdleCount)) /
+ (Time100ns - cygwin_load.Time100ns));
+ cygwin_load.Time100ns = Time100ns;
+ cygwin_load.IdleCount = IdleCount;
+ cygwin_load.LastCounter = CurrCounter;
+ cygwin_load.LastLoad = value;
+ }
+ else { /* Something bad happened.
+ Refuse to measure the load anymore
+ but don't bother releasing the buffer */
+ log_write(0, LOG_MAIN, "Cannot obtain Load Average");
+ cygwin_load.LastLoad = -1;
+ }
+ }
+ }
+ DEBUG(D_load)
+ debug_printf("Perf: load average = %d\n", cygwin_load.LastLoad);
+ return cygwin_load.LastLoad;
+}
+#endif /* OS_LOAD_AVERAGE */
+#endif /* COMPILE_UTILITY */
git://git.exim.org / exim.git / commitdiff