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Diffstat (limited to 'resource/sys/resource.h')
| -rw-r--r-- | resource/sys/resource.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/resource/sys/resource.h b/resource/sys/resource.h new file mode 100644 index 0000000000..9bef483359 --- /dev/null +++ b/resource/sys/resource.h @@ -0,0 +1,154 @@ +/* Copyright (C) 1992, 1994 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#ifndef _SYS_RESOURCE_H + +#define _SYS_RESOURCE_H 1 +#include <features.h> + +__BEGIN_DECLS + +/* Get the system-dependent definitions of RLIM_*. */ +#include <resourcebits.h> + +struct rlimit + { + /* The current (soft) limit. */ + int rlim_cur; + /* The hard limit. */ + int rlim_max; + }; + +/* Value used to indicate that there is no limit. */ +#define RLIM_INFINITY 0x7fffffff + +/* Put the soft and hard limits for RESOURCE in *RLIMITS. + Returns 0 if successful, -1 if not (and sets errno). */ +int getrlimit __P ((enum __rlimit_resource __resource, + struct rlimit * __rlimits)); + +/* Set the soft and hard limits for RESOURCE to *RLIMITS. + Only the super-user can increase hard limits. + Return 0 if successful, -1 if not (and sets errno). */ +int setrlimit __P ((enum __rlimit_resource __resource, + struct rlimit * __rlimits)); + + +/* Whose usage statistics do you want? */ +enum __rusage_who +/* The macro definitions are necessary because some programs want + to test for operating system features with #ifdef RUSAGE_SELF. + In ANSI C the reflexive definition is a no-op. */ + { + /* The calling process. */ + RUSAGE_SELF = 0, +#define RUSAGE_SELF RUSAGE_SELF + /* All of its terminated child processes. */ + RUSAGE_CHILDREN = -1, +#define RUSAGE_CHILDREN RUSAGE_CHILDREN + }; + +#include <sys/time.h> /* For `struct timeval'. */ + +/* Structure which says how much of each resource has been used. */ +struct rusage + { + /* Total amount of user time used. */ + struct timeval ru_utime; + /* Total amount of system time used. */ + struct timeval ru_stime; + /* Maximum resident set size (in kilobytes). */ + long ru_maxrss; + /* Amount of sharing of text segment memory + with other processes (kilobyte-seconds). */ + long ru_ixrss; + /* Amount of data segment memory used (kilobyte-seconds). */ + long ru_idrss; + /* Amount of stack memory used (kilobyte-seconds). */ + long ru_isrss; + /* Number of soft page faults (i.e. those serviced by reclaiming + a page from the list of pages awaiting reallocation. */ + long ru_minflt; + /* Number of hard page faults (i.e. those that required I/O). */ + long ru_majflt; + /* Number of times a process was swapped out of physical memory. */ + long ru_nswap; + /* Number of input operations via the file system. Note: This + and `ru_oublock' do not include operations with the cache. */ + long ru_inblock; + /* Number of output operations via the file system. */ + long ru_oublock; + /* Number of IPC messages sent. */ + long ru_msgsnd; + /* Number of IPC messages received. */ + long ru_msgrcv; + /* Number of signals delivered. */ + long ru_nsignals; + /* Number of voluntary context switches, i.e. because the process + gave up the process before it had to (usually to wait for some + resource to be available). */ + long ru_nvcsw; + /* Number of involuntary context switches, i.e. a higher priority process + became runnable or the current process used up its time slice. */ + long ru_nivcsw; + }; + +/* Return resource usage information on process indicated by WHO + and put it in *USAGE. Returns 0 for success, -1 for failure. */ +int __getrusage __P ((enum __rusage_who __who, struct rusage * __usage)); +int getrusage __P ((enum __rusage_who __who, struct rusage * __usage)); + +/* Function depends on CMD: + 1 = Return the limit on the size of a file, in units of 512 bytes. + 2 = Set the limit on the size of a file to NEWLIMIT. Only the + super-user can increase the limit. + 3 = Return the maximum possible address of the data segment. + 4 = Return the maximum number of files that the calling process can open. + Returns -1 on errors. */ +long int __ulimit __P ((int __cmd, long int __newlimit)); +long int ulimit __P ((int __cmd, long int __newlimit)); + + +/* Priority limits. */ +#define PRIO_MIN -20 /* Minimum priority a process can have. */ +#define PRIO_MAX 20 /* Maximum priority a process can have. */ + +/* The type of the WHICH argument to `getpriority' and `setpriority', + indicating what flavor of entity the WHO argument specifies. */ +enum __priority_which + { + PRIO_PROCESS = 0, /* WHO is a process ID. */ + PRIO_PGRP = 1, /* WHO is a process group ID. */ + PRIO_USER = 2, /* WHO is a user ID. */ + }; + +/* Return the highest priority of any process specified by WHICH and WHO + (see above); 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 (above). */ +extern int getpriority __P ((enum __priority_which __which, int __who)); + +/* Set the priority of all processes specified by WHICH and WHO (see above) + to PRIO. Returns 0 on success, -1 on errors. */ +extern int setpriority __P ((enum __priority_which __which, int __who, + int __prio)); + + +__END_DECLS + +#endif /* resource.h */ |