/* vi: set sw=4 ts=4: */ /* * nice() for uClibc * * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org> * Copyright (C) 2005 by Manuel Novoa III <mjn3@codepoet.org> * * GNU Library General Public License (LGPL) version 2 or later. */ #include "syscalls.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) { int s = a + b; if (b < 0) { if (s > a) s = INT_MIN; } else { if (s < a) s = INT_MAX; } return s; } 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); }