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apocelipes
6eae425679
Files in procfs are always changed by kernel. It means if we read the data with more than one read syscall, we could get an incorrect data which was broken by kernel. A typical case about this problem was reported by psutil in https://github.com/giampaolo/psutil/issues/2050 Using an big buffer let read reads the whole file can fix this. psutil uses a 32K buffer while procps-ng uses a 8K buffer, i think a 8K buffer is enough.
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
#include "memory.h"
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#include "common/io/io.h"
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#include "util/mallocHelper.h"
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#include <inttypes.h>
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const char* ffDetectMemory(FFMemoryResult* ram)
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{
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char buf[PROC_FILE_BUFFSIZ];
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ssize_t nRead = ffReadFileData("/proc/meminfo", sizeof(buf) - 1, buf);
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if(nRead < 0)
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return "ffReadFileData(\"/proc/meminfo\", sizeof(buf)-1, buf)";
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buf[nRead] = '\0';
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uint64_t memTotal = 0,
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shmem = 0,
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memFree = 0,
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buffers = 0,
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cached = 0,
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sReclaimable = 0;
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char *token = NULL;
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if((token = strstr(buf, "MemTotal:")) != NULL)
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sscanf(token, "MemTotal: %" PRIu64, &memTotal);
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if((token = strstr(buf, "MemFree:")) != NULL)
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sscanf(token, "MemFree: %" PRIu64, &memFree);
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if((token = strstr(buf, "Buffers:")) != NULL)
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sscanf(token, "Buffers: %" PRIu64, &buffers);
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if((token = strstr(buf, "Cached:")) != NULL)
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sscanf(token, "Cached: %" PRIu64, &cached);
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if((token = strstr(buf, "Shmem:")) != NULL)
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sscanf(token, "Shmem: %" PRIu64, &shmem);
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if((token = strstr(buf, "SReclaimable:")) != NULL)
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sscanf(token, "SReclaimable: %" PRIu64, &sReclaimable);
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ram->bytesTotal = memTotal * 1024lu;
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ram->bytesUsed = (memTotal + shmem - memFree - buffers - cached - sReclaimable) * 1024lu;
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return NULL;
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}
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