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#include <u.h>
#include <libc.h>
#include <oventi.h>
enum {
IdealAlignment = 32,
ChunkSize = 128*1024,
};
void
vtMemFree(void *p)
{
if(p == 0)
return;
free(p);
}
void *
vtMemAlloc(int size)
{
void *p;
p = malloc(size);
if(p == 0)
vtFatal("vtMemAlloc: out of memory");
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtMemAllocZ(int size)
{
void *p = vtMemAlloc(size);
memset(p, 0, size);
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtMemRealloc(void *p, int size)
{
if(p == nil)
return vtMemAlloc(size);
p = realloc(p, size);
if(p == 0)
vtFatal("vtRealloc: out of memory");
setrealloctag(p, getcallerpc(&size));
return p;
}
void *
vtMemBrk(int n)
{
static Lock lk;
static uchar *buf;
static int nbuf;
static int nchunk;
int align, pad;
void *p;
if(n >= IdealAlignment)
align = IdealAlignment;
else if(n > 8)
align = 8;
else
align = 4;
lock(&lk);
pad = (align - (uintptr)buf) & (align-1);
if(n + pad > nbuf) {
buf = vtMemAllocZ(ChunkSize);
setmalloctag(buf, getcallerpc(&n));
nbuf = ChunkSize;
pad = (align - (uintptr)buf) & (align-1);
nchunk++;
}
assert(n + pad <= nbuf);
p = buf + pad;
buf += pad + n;
nbuf -= pad + n;
unlock(&lk);
return p;
}
void
vtThreadSetName(char *name)
{
int fd;
char buf[32];
sprint(buf, "/proc/%d/args", getpid());
if((fd = open(buf, OWRITE)) >= 0){
write(fd, name, strlen(name));
close(fd);
}
}
int
vtFdRead(int fd, uchar *buf, int n)
{
n = read(fd, buf, n);
if(n < 0) {
vtOSError();
return -1;
}
if(n == 0) {
vtSetError("unexpected EOF");
return 0;
}
return n;
}
int
vtFdWrite(int fd, uchar *buf, int n)
{
int nn;
nn = write(fd, buf, n);
if(nn < 0) {
vtOSError();
return 0;
}
if(n != nn) {
vtSetError("truncated write");
return 0;
}
return 1;
}
void
vtFdClose(int fd)
{
close(fd);
}
char *
vtOSError(void)
{
return vtSetError("%r");
}
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