minix/lib/posix/priority.c
2005-07-01 18:01:33 +00:00

46 lines
764 B
C

/*
priority.c
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <lib.h>
#include <unistd.h>
#include <string.h>
#include <stddef.h>
int getpriority(int which, int who)
{
int v;
message m;
m.m1_i1 = which;
m.m1_i2 = who;
/* GETPRIORITY returns negative for error.
* Otherwise, it returns the priority plus the minimum
* priority, to distiginuish from error. We have to
* correct for this. (The user program has to check errno
* to see if something really went wrong.)
*/
if((v = _syscall(MM, GETPRIORITY, &m)) < 0) {
return v;
}
return v + PRIO_MIN;
}
int setpriority(int which, int who, int prio)
{
message m;
m.m1_i1 = which;
m.m1_i2 = who;
m.m1_i3 = prio;
return _syscall(MM, SETPRIORITY, &m);
}