From 7f3caba522f4d24764f29d83aa2de9198bb7f01c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 24 May 2024 06:52:22 +0200 Subject: Adding upstream version 6.8. Signed-off-by: Daniel Baumann --- man2/getrlimit.2 | 853 ------------------------------------------------------- 1 file changed, 853 deletions(-) delete mode 100644 man2/getrlimit.2 (limited to 'man2/getrlimit.2') diff --git a/man2/getrlimit.2 b/man2/getrlimit.2 deleted file mode 100644 index ece8e97..0000000 --- a/man2/getrlimit.2 +++ /dev/null @@ -1,853 +0,0 @@ -'\" t -.\" Copyright (c) 1992 Drew Eckhardt, March 28, 1992 -.\" and Copyright (c) 2002, 2004, 2005, 2008, 2010 Michael Kerrisk -.\" -.\" SPDX-License-Identifier: Linux-man-pages-copyleft -.\" -.\" Modified by Michael Haardt -.\" Modified 1993-07-23 by Rik Faith -.\" Modified 1996-01-13 by Arnt Gulbrandsen -.\" Modified 1996-01-22 by aeb, following a remark by -.\" Tigran Aivazian -.\" Modified 1996-04-14 by aeb, following a remark by -.\" Robert Bihlmeyer -.\" Modified 1996-10-22 by Eric S. Raymond -.\" Modified 2001-05-04 by aeb, following a remark by -.\" Håvard Lygre -.\" Modified 2001-04-17 by Michael Kerrisk -.\" Modified 2002-06-13 by Michael Kerrisk -.\" Added note on nonstandard behavior when SIGCHLD is ignored. -.\" Modified 2002-07-09 by Michael Kerrisk -.\" Enhanced descriptions of 'resource' values -.\" Modified 2003-11-28 by aeb, added RLIMIT_CORE -.\" Modified 2004-03-26 by aeb, added RLIMIT_AS -.\" Modified 2004-06-16 by Michael Kerrisk -.\" Added notes on CAP_SYS_RESOURCE -.\" -.\" 2004-11-16 -- mtk: the getrlimit.2 page, which formally included -.\" coverage of getrusage(2), has been split, so that the latter -.\" is now covered in its own getrusage.2. -.\" -.\" Modified 2004-11-16, mtk: A few other minor changes -.\" Modified 2004-11-23, mtk -.\" Added notes on RLIMIT_MEMLOCK, RLIMIT_NPROC, and RLIMIT_RSS -.\" to "CONFORMING TO" -.\" Modified 2004-11-25, mtk -.\" Rewrote discussion on RLIMIT_MEMLOCK to incorporate kernel -.\" 2.6.9 changes. -.\" Added note on RLIMIT_CPU error in older kernels -.\" 2004-11-03, mtk, Added RLIMIT_SIGPENDING -.\" 2005-07-13, mtk, documented RLIMIT_MSGQUEUE limit. -.\" 2005-07-28, mtk, Added descriptions of RLIMIT_NICE and RLIMIT_RTPRIO -.\" 2008-05-07, mtk / Peter Zijlstra, Added description of RLIMIT_RTTIME -.\" 2010-11-06, mtk: Added documentation of prlimit() -.\" -.TH getrlimit 2 2024-02-25 "Linux man-pages 6.7" -.SH NAME -getrlimit, setrlimit, prlimit \- get/set resource limits -.SH LIBRARY -Standard C library -.RI ( libc ", " \-lc ) -.SH SYNOPSIS -.nf -.B #include -.P -.BI "int getrlimit(int " resource ", struct rlimit *" rlim ); -.BI "int setrlimit(int " resource ", const struct rlimit *" rlim ); -.P -.BI "int prlimit(pid_t " pid ", int " resource , -.BI " const struct rlimit *_Nullable " new_limit , -.BI " struct rlimit *_Nullable " old_limit ); -.fi -.P -.RS -4 -Feature Test Macro Requirements for glibc (see -.BR feature_test_macros (7)): -.RE -.P -.BR prlimit (): -.nf - _GNU_SOURCE -.fi -.SH DESCRIPTION -The -.BR getrlimit () -and -.BR setrlimit () -system calls get and set resource limits. -Each resource has an associated soft and hard limit, as defined by the -.I rlimit -structure: -.P -.in +4n -.EX -struct rlimit { - rlim_t rlim_cur; /* Soft limit */ - rlim_t rlim_max; /* Hard limit (ceiling for rlim_cur) */ -}; -.EE -.in -.P -The soft limit is the value that the kernel enforces for the -corresponding resource. -The hard limit acts as a ceiling for the soft limit: -an unprivileged process may set only its soft limit to a value in the -range from 0 up to the hard limit, and (irreversibly) lower its hard limit. -A privileged process (under Linux: one with the -.B CAP_SYS_RESOURCE -capability in the initial user namespace) -may make arbitrary changes to either limit value. -.P -The value -.B RLIM_INFINITY -denotes no limit on a resource (both in the structure returned by -.BR getrlimit () -and in the structure passed to -.BR setrlimit ()). -.P -The -.I resource -argument must be one of: -.TP -.B RLIMIT_AS -This is the maximum size of the process's virtual memory -(address space). -The limit is specified in bytes, and is rounded down to the system page size. -.\" since Linux 2.0.27 / Linux 2.1.12 -This limit affects calls to -.BR brk (2), -.BR mmap (2), -and -.BR mremap (2), -which fail with the error -.B ENOMEM -upon exceeding this limit. -In addition, automatic stack expansion fails -(and generates a -.B SIGSEGV -that kills the process if no alternate stack -has been made available via -.BR sigaltstack (2)). -Since the value is a \fIlong\fP, on machines with a 32-bit \fIlong\fP -either this limit is at most 2\ GiB, or this resource is unlimited. -.TP -.B RLIMIT_CORE -This is the maximum size of a -.I core -file (see -.BR core (5)) -in bytes that the process may dump. -When 0 no core dump files are created. -When nonzero, larger dumps are truncated to this size. -.TP -.B RLIMIT_CPU -This is a limit, in seconds, -on the amount of CPU time that the process can consume. -When the process reaches the soft limit, it is sent a -.B SIGXCPU -signal. -The default action for this signal is to terminate the process. -However, the signal can be caught, and the handler can return control to -the main program. -If the process continues to consume CPU time, it will be sent -.B SIGXCPU -once per second until the hard limit is reached, at which time -it is sent -.BR SIGKILL . -(This latter point describes Linux behavior. -Implementations vary in how they treat processes which continue to -consume CPU time after reaching the soft limit. -Portable applications that need to catch this signal should -perform an orderly termination upon first receipt of -.BR SIGXCPU .) -.TP -.B RLIMIT_DATA -This is the maximum size -of the process's data segment (initialized data, -uninitialized data, and heap). -The limit is specified in bytes, and is rounded down to the system page size. -This limit affects calls to -.BR brk (2), -.BR sbrk (2), -and (since Linux 4.7) -.BR mmap (2), -.\" commits 84638335900f1995495838fe1bd4870c43ec1f67 -.\" ("mm: rework virtual memory accounting"), -.\" f4fcd55841fc9e46daac553b39361572453c2b88 -.\" (mm: enable RLIMIT_DATA by default with workaround for valgrind). -which fail with the error -.B ENOMEM -upon encountering the soft limit of this resource. -.TP -.B RLIMIT_FSIZE -This is the maximum size in bytes of files that the process may create. -Attempts to extend a file beyond this limit result in delivery of a -.B SIGXFSZ -signal. -By default, this signal terminates a process, but a process can -catch this signal instead, in which case the relevant system call (e.g., -.BR write (2), -.BR truncate (2)) -fails with the error -.BR EFBIG . -.TP -.BR RLIMIT_LOCKS " (Linux 2.4.0 to Linux 2.4.24)" -.\" to be precise: Linux 2.4.0-test9; no longer in Linux 2.4.25 / Linux 2.5.65 -This is a limit on the combined number of -.BR flock (2) -locks and -.BR fcntl (2) -leases that this process may establish. -.TP -.B RLIMIT_MEMLOCK -This is the maximum number of bytes of memory that may be locked -into RAM. -This limit is in effect rounded down to the nearest multiple -of the system page size. -This limit affects -.BR mlock (2), -.BR mlockall (2), -and the -.BR mmap (2) -.B MAP_LOCKED -operation. -Since Linux 2.6.9, it also affects the -.BR shmctl (2) -.B SHM_LOCK -operation, where it sets a maximum on the total bytes in -shared memory segments (see -.BR shmget (2)) -that may be locked by the real user ID of the calling process. -The -.BR shmctl (2) -.B SHM_LOCK -locks are accounted for separately from the per-process memory -locks established by -.BR mlock (2), -.BR mlockall (2), -and -.BR mmap (2) -.BR MAP_LOCKED ; -a process can lock bytes up to this limit in each of these -two categories. -.IP -Before Linux 2.6.9, this limit controlled the amount of -memory that could be locked by a privileged process. -Since Linux 2.6.9, no limits are placed on the amount of memory -that a privileged process may lock, and this limit instead governs -the amount of memory that an unprivileged process may lock. -.TP -.BR RLIMIT_MSGQUEUE " (since Linux 2.6.8)" -This is a limit on the number of bytes that can be allocated -for POSIX message queues for the real user ID of the calling process. -This limit is enforced for -.BR mq_open (3). -Each message queue that the user creates counts (until it is removed) -against this limit according to the formula: -.RS 4 -.IP -Since Linux 3.5: -.IP -.in +4n -.EX -bytes = attr.mq_maxmsg * sizeof(struct msg_msg) + - MIN(attr.mq_maxmsg, MQ_PRIO_MAX) * - sizeof(struct posix_msg_tree_node)+ - /* For overhead */ - attr.mq_maxmsg * attr.mq_msgsize; - /* For message data */ -.EE -.in -.IP -Linux 3.4 and earlier: -.IP -.in +4n -.EX -bytes = attr.mq_maxmsg * sizeof(struct msg_msg *) + - /* For overhead */ - attr.mq_maxmsg * attr.mq_msgsize; - /* For message data */ -.EE -.in -.RE -.IP -where -.I attr -is the -.I mq_attr -structure specified as the fourth argument to -.BR mq_open (3), -and the -.I msg_msg -and -.I posix_msg_tree_node -structures are kernel-internal structures. -.IP -The "overhead" addend in the formula accounts for overhead -bytes required by the implementation -and ensures that the user cannot -create an unlimited number of zero-length messages (such messages -nevertheless each consume some system memory for bookkeeping overhead). -.TP -.BR RLIMIT_NICE " (since Linux 2.6.12, but see BUGS below)" -This specifies a ceiling to which the process's nice value can be raised using -.BR setpriority (2) -or -.BR nice (2). -The actual ceiling for the nice value is calculated as -.IR "20\ \-\ rlim_cur" . -The useful range for this limit is thus from 1 -(corresponding to a nice value of 19) to 40 -(corresponding to a nice value of \-20). -This unusual choice of range was necessary -because negative numbers cannot be specified -as resource limit values, since they typically have special meanings. -For example, -.B RLIM_INFINITY -typically is the same as \-1. -For more detail on the nice value, see -.BR sched (7). -.TP -.B RLIMIT_NOFILE -This specifies a value one greater than the maximum file descriptor number -that can be opened by this process. -Attempts -.RB ( open (2), -.BR pipe (2), -.BR dup (2), -etc.) -to exceed this limit yield the error -.BR EMFILE . -(Historically, this limit was named -.B RLIMIT_OFILE -on BSD.) -.IP -Since Linux 4.5, -this limit also defines the maximum number of file descriptors that -an unprivileged process (one without the -.B CAP_SYS_RESOURCE -capability) may have "in flight" to other processes, -by being passed across UNIX domain sockets. -This limit applies to the -.BR sendmsg (2) -system call. -For further details, see -.BR unix (7). -.TP -.B RLIMIT_NPROC -This is a limit on the number of extant process -(or, more precisely on Linux, threads) -for the real user ID of the calling process. -So long as the current number of processes belonging to this -process's real user ID is greater than or equal to this limit, -.BR fork (2) -fails with the error -.BR EAGAIN . -.IP -The -.B RLIMIT_NPROC -limit is not enforced for processes that have either the -.B CAP_SYS_ADMIN -or the -.B CAP_SYS_RESOURCE -capability, -or run with real user ID 0. -.TP -.B RLIMIT_RSS -This is a limit (in bytes) on the process's resident set -(the number of virtual pages resident in RAM). -This limit has effect only in Linux 2.4.x, x < 30, and there -affects only calls to -.BR madvise (2) -specifying -.BR MADV_WILLNEED . -.\" As at Linux 2.6.12, this limit still does nothing in Linux 2.6 though -.\" talk of making it do something has surfaced from time to time in LKML -.\" -- MTK, Jul 05 -.TP -.BR RLIMIT_RTPRIO " (since Linux 2.6.12, but see BUGS)" -This specifies a ceiling on the real-time priority that may be set for -this process using -.BR sched_setscheduler (2) -and -.BR sched_setparam (2). -.IP -For further details on real-time scheduling policies, see -.BR sched (7) -.TP -.BR RLIMIT_RTTIME " (since Linux 2.6.25)" -This is a limit (in microseconds) -on the amount of CPU time that a process scheduled -under a real-time scheduling policy may consume without making a blocking -system call. -For the purpose of this limit, -each time a process makes a blocking system call, -the count of its consumed CPU time is reset to zero. -The CPU time count is not reset if the process continues trying to -use the CPU but is preempted, its time slice expires, or it calls -.BR sched_yield (2). -.IP -Upon reaching the soft limit, the process is sent a -.B SIGXCPU -signal. -If the process catches or ignores this signal and -continues consuming CPU time, then -.B SIGXCPU -will be generated once each second until the hard limit is reached, -at which point the process is sent a -.B SIGKILL -signal. -.IP -The intended use of this limit is to stop a runaway -real-time process from locking up the system. -.IP -For further details on real-time scheduling policies, see -.BR sched (7) -.TP -.BR RLIMIT_SIGPENDING " (since Linux 2.6.8)" -This is a limit on the number of signals -that may be queued for the real user ID of the calling process. -Both standard and real-time signals are counted for the purpose of -checking this limit. -However, the limit is enforced only for -.BR sigqueue (3); -it is always possible to use -.BR kill (2) -to queue one instance of any of the signals that are not already -queued to the process. -.\" This replaces the /proc/sys/kernel/rtsig-max system-wide limit -.\" that was present in Linux <= 2.6.7. MTK Dec 04 -.TP -.B RLIMIT_STACK -This is the maximum size of the process stack, in bytes. -Upon reaching this limit, a -.B SIGSEGV -signal is generated. -To handle this signal, a process must employ an alternate signal stack -.RB ( sigaltstack (2)). -.IP -Since Linux 2.6.23, -this limit also determines the amount of space used for the process's -command-line arguments and environment variables; for details, see -.BR execve (2). -.SS prlimit() -.\" commit c022a0acad534fd5f5d5f17280f6d4d135e74e81 -.\" Author: Jiri Slaby -.\" Date: Tue May 4 18:03:50 2010 +0200 -.\" -.\" rlimits: implement prlimit64 syscall -.\" -.\" commit 6a1d5e2c85d06da35cdfd93f1a27675bfdc3ad8c -.\" Author: Jiri Slaby -.\" Date: Wed Mar 24 17:06:58 2010 +0100 -.\" -.\" rlimits: add rlimit64 structure -.\" -The Linux-specific -.BR prlimit () -system call combines and extends the functionality of -.BR setrlimit () -and -.BR getrlimit (). -It can be used to both set and get the resource limits of an arbitrary process. -.P -The -.I resource -argument has the same meaning as for -.BR setrlimit () -and -.BR getrlimit (). -.P -If the -.I new_limit -argument is not NULL, then the -.I rlimit -structure to which it points is used to set new values for -the soft and hard limits for -.IR resource . -If the -.I old_limit -argument is not NULL, then a successful call to -.BR prlimit () -places the previous soft and hard limits for -.I resource -in the -.I rlimit -structure pointed to by -.IR old_limit . -.P -The -.I pid -argument specifies the ID of the process on which the call is to operate. -If -.I pid -is 0, then the call applies to the calling process. -To set or get the resources of a process other than itself, -the caller must have the -.B CAP_SYS_RESOURCE -capability in the user namespace of the process -whose resource limits are being changed, or the -real, effective, and saved set user IDs of the target process -must match the real user ID of the caller -.I and -the real, effective, and saved set group IDs of the target process -must match the real group ID of the caller. -.\" FIXME . this permission check is strange -.\" Asked about this on LKML, 7 Nov 2010 -.\" "Inconsistent credential checking in prlimit() syscall" -.SH RETURN VALUE -On success, these system calls return 0. -On error, \-1 is returned, and -.I errno -is set to indicate the error. -.SH ERRORS -.TP -.B EFAULT -A pointer argument points to a location -outside the accessible address space. -.TP -.B EINVAL -The value specified in -.I resource -is not valid; -or, for -.BR setrlimit () -or -.BR prlimit (): -.I rlim\->rlim_cur -was greater than -.IR rlim\->rlim_max . -.TP -.B EPERM -An unprivileged process tried to raise the hard limit; the -.B CAP_SYS_RESOURCE -capability is required to do this. -.TP -.B EPERM -The caller tried to increase the hard -.B RLIMIT_NOFILE -limit above the maximum defined by -.I /proc/sys/fs/nr_open -(see -.BR proc (5)) -.TP -.B EPERM -.RB ( prlimit ()) -The calling process did not have permission to set limits -for the process specified by -.IR pid . -.TP -.B ESRCH -Could not find a process with the ID specified in -.IR pid . -.SH ATTRIBUTES -For an explanation of the terms used in this section, see -.BR attributes (7). -.TS -allbox; -lbx lb lb -l l l. -Interface Attribute Value -T{ -.na -.nh -.BR getrlimit (), -.BR setrlimit (), -.BR prlimit () -T} Thread safety MT-Safe -.TE -.SH STANDARDS -.TP -.BR getrlimit () -.TQ -.BR setrlimit () -POSIX.1-2008. -.TP -.BR prlimit () -Linux. -.P -.B RLIMIT_MEMLOCK -and -.B RLIMIT_NPROC -derive from BSD and are not specified in POSIX.1; -they are present on the BSDs and Linux, but on few other implementations. -.B RLIMIT_RSS -derives from BSD and is not specified in POSIX.1; -it is nevertheless present on most implementations. -.BR \%RLIMIT_MSGQUEUE , -.BR RLIMIT_NICE , -.BR RLIMIT_RTPRIO , -.BR RLIMIT_RTTIME , -and -.B \%RLIMIT_SIGPENDING -are Linux-specific. -.SH HISTORY -.TP -.BR getrlimit () -.TQ -.BR setrlimit () -POSIX.1-2001, SVr4, 4.3BSD. -.TP -.BR prlimit () -Linux 2.6.36, -glibc 2.13. -.SH NOTES -A child process created via -.BR fork (2) -inherits its parent's resource limits. -Resource limits are preserved across -.BR execve (2). -.P -Resource limits are per-process attributes that are shared -by all of the threads in a process. -.P -Lowering the soft limit for a resource below the process's -current consumption of that resource will succeed -(but will prevent the process from further increasing -its consumption of the resource). -.P -One can set the resource limits of the shell using the built-in -.I ulimit -command -.RI ( limit -in -.BR csh (1)). -The shell's resource limits are inherited by the processes that -it creates to execute commands. -.P -Since Linux 2.6.24, the resource limits of any process can be inspected via -.IR /proc/ pid /limits ; -see -.BR proc (5). -.P -Ancient systems provided a -.BR vlimit () -function with a similar purpose to -.BR setrlimit (). -For backward compatibility, glibc also provides -.BR vlimit (). -All new applications should be written using -.BR setrlimit (). -.SS C library/kernel ABI differences -Since glibc 2.13, the glibc -.BR getrlimit () -and -.BR setrlimit () -wrapper functions no longer invoke the corresponding system calls, -but instead employ -.BR prlimit (), -for the reasons described in BUGS. -.P -The name of the glibc wrapper function is -.BR prlimit (); -the underlying system call is -.BR prlimit64 (). -.SH BUGS -In older Linux kernels, the -.B SIGXCPU -and -.B SIGKILL -signals delivered when a process encountered the soft and hard -.B RLIMIT_CPU -limits were delivered one (CPU) second later than they should have been. -This was fixed in Linux 2.6.8. -.P -In Linux 2.6.x kernels before Linux 2.6.17, a -.B RLIMIT_CPU -limit of 0 is wrongly treated as "no limit" (like -.BR RLIM_INFINITY ). -Since Linux 2.6.17, setting a limit of 0 does have an effect, -but is actually treated as a limit of 1 second. -.\" see http://marc.theaimsgroup.com/?l=linux-kernel&m=114008066530167&w=2 -.P -A kernel bug means that -.\" See https://lwn.net/Articles/145008/ -.B RLIMIT_RTPRIO -does not work in Linux 2.6.12; the problem is fixed in Linux 2.6.13. -.P -In Linux 2.6.12, there was an off-by-one mismatch -between the priority ranges returned by -.BR getpriority (2) -and -.BR RLIMIT_NICE . -This had the effect that the actual ceiling for the nice value -was calculated as -.IR "19\ \-\ rlim_cur" . -This was fixed in Linux 2.6.13. -.\" see http://marc.theaimsgroup.com/?l=linux-kernel&m=112256338703880&w=2 -.P -Since Linux 2.6.12, -.\" The relevant patch, sent to LKML, seems to be -.\" http://thread.gmane.org/gmane.linux.kernel/273462 -.\" From: Roland McGrath redhat.com> -.\" Subject: [PATCH 7/7] make RLIMIT_CPU/SIGXCPU per-process -.\" Date: 2005-01-23 23:27:46 GMT -if a process reaches its soft -.B RLIMIT_CPU -limit and has a handler installed for -.BR SIGXCPU , -then, in addition to invoking the signal handler, -the kernel increases the soft limit by one second. -This behavior repeats if the process continues to consume CPU time, -until the hard limit is reached, -at which point the process is killed. -Other implementations -.\" Tested Solaris 10, FreeBSD 9, OpenBSD 5.0 -do not change the -.B RLIMIT_CPU -soft limit in this manner, -and the Linux behavior is probably not standards conformant; -portable applications should avoid relying on this Linux-specific behavior. -.\" FIXME . https://bugzilla.kernel.org/show_bug.cgi?id=50951 -The Linux-specific -.B RLIMIT_RTTIME -limit exhibits the same behavior when the soft limit is encountered. -.P -Kernels before Linux 2.4.22 did not diagnose the error -.B EINVAL -for -.BR setrlimit () -when -.I rlim\->rlim_cur -was greater than -.IR rlim\->rlim_max . -.\" d3561f78fd379a7110e46c87964ba7aa4120235c -.P -Linux doesn't return an error when an attempt to set -.B RLIMIT_CPU -has failed, for compatibility reasons. -.\" -.SS Representation of \[dq]large\[dq] resource limit values on 32-bit platforms -The glibc -.BR getrlimit () -and -.BR setrlimit () -wrapper functions use a 64-bit -.I rlim_t -data type, even on 32-bit platforms. -However, the -.I rlim_t -data type used in the -.BR getrlimit () -and -.BR setrlimit () -system calls is a (32-bit) -.IR "unsigned long" . -.\" Linux still uses long for limits internally: -.\" c022a0acad534fd5f5d5f17280f6d4d135e74e81 -.\" kernel/sys.c:do_prlimit() still uses struct rlimit which -.\" uses kernel_ulong_t for its members, i.e. 32-bit on 32-bit kernel. -Furthermore, in Linux, -the kernel represents resource limits on 32-bit platforms as -.IR "unsigned long" . -However, a 32-bit data type is not wide enough. -.\" https://bugzilla.kernel.org/show_bug.cgi?id=5042 -.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=12201 -The most pertinent limit here is -.BR \%RLIMIT_FSIZE , -which specifies the maximum size to which a file can grow: -to be useful, this limit must be represented using a type -that is as wide as the type used to -represent file offsets\[em]that is, as wide as a 64-bit -.B off_t -(assuming a program compiled with -.IR _FILE_OFFSET_BITS=64 ). -.P -To work around this kernel limitation, -if a program tried to set a resource limit to a value larger than -can be represented in a 32-bit -.IR "unsigned long" , -then the glibc -.BR setrlimit () -wrapper function silently converted the limit value to -.BR RLIM_INFINITY . -In other words, the requested resource limit setting was silently ignored. -.P -Since glibc 2.13, -.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=12201 -glibc works around the limitations of the -.BR \%getrlimit () -and -.BR setrlimit () -system calls by implementing -.BR setrlimit () -and -.BR \%getrlimit () -as wrapper functions that call -.BR prlimit (). -.SH EXAMPLES -The program below demonstrates the use of -.BR prlimit (). -.P -.\" SRC BEGIN (getrlimit.c) -.EX -#define _GNU_SOURCE -#define _FILE_OFFSET_BITS 64 -#include -#include -#include -#include -#include -#include -\& -int -main(int argc, char *argv[]) -{ - pid_t pid; - struct rlimit old, new; - struct rlimit *newp; -\& - if (!(argc == 2 || argc == 4)) { - fprintf(stderr, "Usage: %s [ " - "]\en", argv[0]); - exit(EXIT_FAILURE); - } -\& - pid = atoi(argv[1]); /* PID of target process */ -\& - newp = NULL; - if (argc == 4) { - new.rlim_cur = atoi(argv[2]); - new.rlim_max = atoi(argv[3]); - newp = &new; - } -\& - /* Set CPU time limit of target process; retrieve and display - previous limit */ -\& - if (prlimit(pid, RLIMIT_CPU, newp, &old) == \-1) - err(EXIT_FAILURE, "prlimit\-1"); - printf("Previous limits: soft=%jd; hard=%jd\en", - (intmax_t) old.rlim_cur, (intmax_t) old.rlim_max); -\& - /* Retrieve and display new CPU time limit */ -\& - if (prlimit(pid, RLIMIT_CPU, NULL, &old) == \-1) - err(EXIT_FAILURE, "prlimit\-2"); - printf("New limits: soft=%jd; hard=%jd\en", - (intmax_t) old.rlim_cur, (intmax_t) old.rlim_max); -\& - exit(EXIT_SUCCESS); -} -.EE -.\" SRC END -.SH SEE ALSO -.BR prlimit (1), -.BR dup (2), -.BR fcntl (2), -.BR fork (2), -.BR getrusage (2), -.BR mlock (2), -.BR mmap (2), -.BR open (2), -.BR quotactl (2), -.BR sbrk (2), -.BR shmctl (2), -.BR malloc (3), -.BR sigqueue (3), -.BR ulimit (3), -.BR core (5), -.BR capabilities (7), -.BR cgroups (7), -.BR credentials (7), -.BR signal (7) -- cgit v1.2.3