Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>

static
char*
skip(char *p)
{

        while(*p == ' ')
                p++;
        while(*p != ' ' && *p != 0)
                p++;
        return p;
}

/*
 *  after a fork with fd's copied, both fd's are pointing to
 *  the same Chan structure.  Since the offset is kept in the Chan
 *  structure, the seek's and read's in the two processes can be
 *  are competing moving the offset around.  Hence the unusual loop
 *  in the middle of this routine.
 */
long
times(long *t)
{
        char b[200], *p;
        static int f = -1;
        int i, retries;
        ulong r;

        memset(b, 0, sizeof(b));
        for(retries = 0; retries < 100; retries++){
                if(f < 0)
                        f = open("/dev/cputime", OREAD|OCEXEC);
                if(f < 0)
                        break;
                if(seek(f, 0, 0) < 0 || (i = read(f, b, sizeof(b))) < 0){
                        close(f);
                        f = -1;
                } else {
                        if(i != 0)
                                break;
                }
        }
        p = b;
        if(t)
                t[0] = atol(p);
        p = skip(p);
        if(t)
                t[1] = atol(p);
        p = skip(p);
        r = atol(p);
        if(t){
                p = skip(p);
                t[2] = atol(p);
                p = skip(p);
                t[3] = atol(p);
        }
        return r;
}