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ntdll: Parse sysfs cpu_shared_map using helper function. 

Signed-off-by: Roderick Colenbrander <thunderbird2k@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Roderick Colenbrander 2018-12-02 22:53:15 -08:00 committed by Alexandre Julliard
parent 9988bb5e07
commit ed75a7b344
1 changed files with 31 additions and 9 deletions
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40
dlls/ntdll/nt.c
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@ -1604,6 +1604,36 @@ static inline BOOL logical_proc_info_add_group(SYSTEM_LOGICAL_PROCESSOR_INFORMAT
}
#ifdef linux
/* Helper function for counting bitmap values as commonly used by the Linux kernel
* for storing CPU masks in sysfs. The format is comma separated lists of hex values
* each max 32-bit e.g. "00ff" or even "00,00000000,0000ffff".
*
* Example files include:
* - /sys/devices/system/cpu/cpu0/cache/index0/shared_cpu_map
* - /sys/devices/system/cpu/cpu0/topology/thread_siblings
*/
static BOOL sysfs_parse_bitmap(const char *filename, ULONG_PTR * const mask)
{
FILE *f;
DWORD r;
f = fopen(filename, "r");
if (!f)
return FALSE;
while (!feof(f))
{
char op;
if (!fscanf(f, "%x%c ", &r, &op))
break;
*mask = (sizeof(ULONG_PTR)>sizeof(int) ? *mask<<(8*sizeof(DWORD)) : 0) + r;
}
fclose(f);
return TRUE;
}
/* for 'data', max_len is the array count. for 'dataex', max_len is in bytes */
static NTSTATUS create_logical_proc_info(SYSTEM_LOGICAL_PROCESSOR_INFORMATION **data,
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX **dataex, DWORD *max_len)
@ -1693,15 +1723,7 @@ static NTSTATUS create_logical_proc_info(SYSTEM_LOGICAL_PROCESSOR_INFORMATION **
ULONG_PTR mask = 0;
sprintf(name, cache_info, i, j, "shared_cpu_map");
f = fopen(name, "r");
if(!f) continue;
while(!feof(f))
{
if(!fscanf(f, "%x%c ", &r, &op))
break;
mask = (sizeof(ULONG_PTR)>sizeof(int) ? mask<<(8*sizeof(DWORD)) : 0) + r;
}
fclose(f);
if(!sysfs_parse_bitmap(name, &mask)) continue;
sprintf(name, cache_info, i, j, "level");
f = fopen(name, "r");