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BUG: Fix parsing of linux 2.6 /proc/meminfo format

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Previously KWSys SystemInformation parsed this file assuming a strict
order and set of fields, but the order is not reliable.  This
generalizes the implementation to support any order and extra fields.
This commit is contained in:
Brad King 2009-04-06 14:55:54 -04:00
parent d6bdaf9f13
commit ae284cc5c8
1 changed files with 23 additions and 47 deletions
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70
Source/kwsys/SystemInformation.cxx
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@ -2288,7 +2288,7 @@ int SystemInformationImplementation::QueryMemory()
unsigned long av=0; unsigned long av=0;
unsigned long ap=0; unsigned long ap=0;
char buffer[1024]; // for skipping unused lines char buffer[1024]; // for reading lines
int linuxMajor = 0; int linuxMajor = 0;
int linuxMinor = 0; int linuxMinor = 0;
@ -2331,56 +2331,32 @@ int SystemInformationImplementation::QueryMemory()
// new /proc/meminfo format since kernel 2.6.x // new /proc/meminfo format since kernel 2.6.x
// Rigorously, this test should check from the developping version 2.5.x // Rigorously, this test should check from the developping version 2.5.x
// that introduced the new format... // that introduced the new format...
unsigned long freeMem;
unsigned long buffersMem;
unsigned long cachedMem;
int status; enum { mMemTotal, mMemFree, mBuffers, mCached, mSwapTotal, mSwapFree };
const char* format[6] =
status=fscanf(fd,"MemTotal:%lu kB\n", &this->TotalPhysicalMemory); { "MemTotal:%lu kB", "MemFree:%lu kB", "Buffers:%lu kB",
if(status==1) "Cached:%lu kB", "SwapTotal:%lu kB", "SwapFree:%lu kB" };
bool have[6] = { false, false, false, false, false, false };
unsigned long value[6];
int count = 0;
while(fgets(buffer, sizeof(buffer), fd))
{ {
status+=fscanf(fd,"MemFree:%lu kB\n", &freeMem); for(int i=0; i < 6; ++i)
{
if(!have[i] && sscanf(buffer, format[i], &value[i]) == 1)
{
have[i] = true;
++count;
}
}
} }
if(status==2) if(count == 6)
{ {
status+=fscanf(fd,"Buffers:%lu kB\n", &buffersMem); this->TotalPhysicalMemory = value[mMemTotal] / 1024;
} this->AvailablePhysicalMemory =
if(status==3) (value[mMemFree] + value[mBuffers] + value[mCached]) / 1024;
{ this->TotalVirtualMemory = value[mSwapTotal] / 1024;
status+=fscanf(fd,"Cached:%lu kB\n", &cachedMem); this->AvailableVirtualMemory = value[mSwapFree] / 1024;
}
if(status==4)
{
this->TotalPhysicalMemory /= 1024;
this->AvailablePhysicalMemory = freeMem+cachedMem+buffersMem;
this->AvailablePhysicalMemory /= 1024;
}
// Skip SwapCached, Active, Inactive, HighTotal, HighFree, LowTotal
// and LowFree.
int i=0;
bool success=status==4;
while(i<7 && success)
{
char *r=fgets(buffer, sizeof(buffer), fd); // skip a line
success=r==buffer;
++i;
}
if(success)
{
status+=fscanf(fd,"SwapTotal:%lu kB\n", &this->TotalVirtualMemory);
}
if(status==5)
{
status+=fscanf(fd,"SwapFree:%lu kB\n", &this->AvailableVirtualMemory);
}
if(status==6)
{
this->TotalVirtualMemory /= 1024;
this->AvailableVirtualMemory /= 1024;
} }
else else
{ {