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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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