minix/lib/libc/sys-minix/priority.c
David van Moolenbroek 24ec0d73b5 Clean up interface to PM and VFS
- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
2014-03-01 09:05:01 +01:00

50 lines
941 B
C

/*
priority.c
*/
#include <sys/cdefs.h>
#include "namespace.h"
#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;
memset(&m, 0, sizeof(m));
m.PM_PRIORITY_WHICH = which;
m.PM_PRIORITY_WHO = 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(PM_PROC_NR, PM_GETPRIORITY, &m)) < 0) {
return v;
}
return v + PRIO_MIN;
}
int setpriority(int which, int who, int prio)
{
message m;
memset(&m, 0, sizeof(m));
m.PM_PRIORITY_WHICH = which;
m.PM_PRIORITY_WHO = who;
m.PM_PRIORITY_PRIO = prio;
return _syscall(PM_PROC_NR, PM_SETPRIORITY, &m);
}