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/*
* nice() for uClibc
*
* Copyright (C) 2005 by Manuel Novoa III <mjn3@codepoet.org>
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <sys/syscall.h>
#include <unistd.h>
#include <sys/resource.h>
#ifdef __NR_nice
# define __NR___syscall_nice __NR_nice
static __inline__ _syscall1(int, __syscall_nice, int, incr)
#else
# include <limits.h>
static __inline__ int int_add_no_wrap(int a, int b)
{
if (b < 0) {
if (a < INT_MIN - b)
return INT_MIN;
} else {
if (a > INT_MAX - b)
return INT_MAX;
}
return a + b;
}
static __inline__ int __syscall_nice(int incr)
{
int old_priority;
# if 1
/* This should never fail. */
old_priority = getpriority(PRIO_PROCESS, 0);
# else
/* But if you want to be paranoid... */
int old_errno;
old_errno = errno;
__set_errno(0);
old_priority = getpriority(PRIO_PROCESS, 0);
if ((old_priority == -1) && errno) {
return -1;
}
__set_errno(old_errno);
# endif
if (setpriority(PRIO_PROCESS, 0, int_add_no_wrap(old_priority, incr))) {
__set_errno(EPERM); /* SUSv3 mandates EPERM for nice failure. */
return -1;
}
return 0;
}
#endif
int nice(int incr)
{
if (__syscall_nice(incr)) {
return -1;
}
return getpriority(PRIO_PROCESS, 0);
}
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