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#include "all.h"
#include "io.h"
Mconf mconf;
static void
mconfinit(void)
{
int nf, pgsize = 0;
ulong size, userpgs = 0, userused = 0;
char *ln, *sl;
char *fields[2];
Biobuf *bp;
Mbank *mbp;
size = 64*MB;
bp = Bopen("#c/swap", OREAD);
if (bp != nil) {
while ((ln = Brdline(bp, '\n')) != nil) {
ln[Blinelen(bp)-1] = '\0';
nf = tokenize(ln, fields, nelem(fields));
if (nf != 2)
continue;
if (strcmp(fields[1], "pagesize") == 0)
pgsize = atoi(fields[0]);
else if (strcmp(fields[1], "user") == 0) {
sl = strchr(fields[0], '/');
if (sl == nil)
continue;
userpgs = atol(sl+1);
userused = atol(fields[0]);
}
}
Bterm(bp);
if (pgsize > 0 && userpgs > 0)
size = (((userpgs - userused)*3LL)/4)*pgsize;
}
mconf.memsize = size;
mbp = mconf.bank;
mbp->base = 0x10000000; /* fake addresses */
mbp->limit = mbp->base + size;
mbp++;
mconf.nbank = mbp - mconf.bank;
}
ulong
meminit(void)
{
conf.nmach = 1;
mconfinit();
return mconf.memsize;
}
/*
* based on libthread's threadsetname, but drags in less library code.
* actually just sets the arguments displayed.
*/
void
procsetname(char *fmt, ...)
{
int fd;
char *cmdname;
char buf[128];
va_list arg;
va_start(arg, fmt);
cmdname = vsmprint(fmt, arg);
va_end(arg);
if (cmdname == nil)
return;
snprint(buf, sizeof buf, "#p/%d/args", getpid());
if((fd = open(buf, OWRITE)) >= 0){
write(fd, cmdname, strlen(cmdname)+1);
close(fd);
}
free(cmdname);
}
void
newproc(void (*f)(void *), void *arg, char *text)
{
int kid = rfork(RFPROC|RFMEM|RFNOWAIT);
if (kid < 0)
sysfatal("can't fork: %r");
if (kid == 0) {
procsetname("%s", text);
(*f)(arg);
exits("child returned");
}
}
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