diff options
Diffstat (limited to 'libc/sysdeps/mach/hurd/getpriority.c')
| -rw-r--r-- | libc/sysdeps/mach/hurd/getpriority.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/libc/sysdeps/mach/hurd/getpriority.c b/libc/sysdeps/mach/hurd/getpriority.c new file mode 100644 index 000000000..8f7c3c6d9 --- /dev/null +++ b/libc/sysdeps/mach/hurd/getpriority.c @@ -0,0 +1,85 @@ +/* Copyright (C) 1994,95,96,97,2000,02 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <limits.h> +#include <hurd.h> +#include <hurd/resource.h> + +/* Return the highest priority of any process specified by WHICH and WHO + (see <sys/resource.h>); if WHO is zero, the current process, process group, + or user (as specified by WHO) is used. A lower priority number means higher + priority. Priorities range from PRIO_MIN to PRIO_MAX. */ +int +getpriority (enum __priority_which which, id_t who) +{ + error_t err, onerr; + int maxpri = INT_MIN; + struct procinfo *pip; /* Just for sizeof. */ + int pibuf[sizeof *pip + 2 * sizeof (pip->threadinfos[0])], *pi = pibuf; + size_t pisize = sizeof pibuf / sizeof pibuf[0]; + + error_t getonepriority (pid_t pid, struct procinfo *pip) + { + if (pip) + onerr = 0; + else + { + int *oldpi = pi; + size_t oldpisize = pisize; + char *tw = 0; + size_t twsz = 0; + int flags = PI_FETCH_TASKINFO; + onerr = __USEPORT (PROC, __proc_getprocinfo (port, pid, &flags, + &pi, &pisize, + &tw, &twsz)); + if (twsz) + __vm_deallocate (__mach_task_self (), (vm_address_t) tw, twsz); + if (pi != oldpi && oldpi != pibuf) + /* Old buffer from last call was not reused; free it. */ + __vm_deallocate (__mach_task_self (), + (vm_address_t) oldpi, oldpisize * sizeof pi[0]); + pip = (struct procinfo *) pi; + } +#ifdef TASK_SCHED_TIMESHARE_INFO + if (!onerr && pip->timeshare_base_info.base_priority > maxpri) + maxpri = pip->timeshare_base_info.base_priority; +#else + if (!onerr && pip->taskinfo.base_priority > maxpri) + maxpri = pip->taskinfo.base_priority; +#endif + return 0; + } + + onerr = 0; + err = _hurd_priority_which_map (which, who, + getonepriority, PI_FETCH_TASKINFO); + + if (pi != pibuf) + __vm_deallocate (__mach_task_self (), + (vm_address_t) pi, pisize * sizeof pi[0]); + + if (!err && maxpri == INT_MIN) + /* No error, but no pids found. */ + err = onerr ?: ESRCH; + + if (err) + return __hurd_fail (err); + + return MACH_PRIORITY_TO_NICE (maxpri); +} +libc_hidden_def (getpriority) |