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126 lines
4.5 KiB
126 lines
4.5 KiB
/* ulimit.c - Modify resource limits
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*
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* Copyright 2015 Rob Landley <rob@landley.net>
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*
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* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ulimit.html
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* And man prlimit(2).
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*
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* Deviations from posix: The units on -f are supposed to be 512 byte
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* "blocks" (no other options are specified, and even hard drives don't
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* do that anymore). Bash uses 1024 byte blocks, so they don't care either.
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* We consistently use bytes everywhere we can.
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*
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* Deviations from bash: Sizes are in bytes (instead of -p 512 and -f 1024).
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* Bash's -p value has been wrong since 2010 (git 35f3d14dbbc5).
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* The kernel implementation of RLIMIT_LOCKS (-x) was removed from Linux in
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* 2003. Bash never implemented -b (it's in the help but unrecognized at
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* runtime). We support -P to affect processes other than us.
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USE_ULIMIT(NEWTOY(ulimit, ">1P#<1SHavutsrRqpnmlifedc[-SH][!apvutsrRqnmlifedc]", TOYFLAG_USR|TOYFLAG_BIN))
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USE_ULIMIT(OLDTOY(prlimit, ulimit, TOYFLAG_USR|TOYFLAG_BIN))
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config ULIMIT
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bool "ulimit"
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default y
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depends on TOYBOX_PRLIMIT
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help
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usage: ulimit [-P PID] [-SHRacdefilmnpqrstuv] [LIMIT]
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Print or set resource limits for process number PID. If no LIMIT specified
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(or read-only -ap selected) display current value (sizes in bytes).
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Default is ulimit -P $PPID -Sf" (show soft filesize of your shell).
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-P PID to affect (default $PPID) -a Show all limits
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-S Set/show soft limit -H Set/show hard (maximum) limit
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-c Core file size (blocks) -d Process data segment (KiB)
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-e Max scheduling priority -f File size (KiB)
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-i Pending signal count -l Locked memory (KiB)
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-m Resident Set Size (KiB) -n Number of open files
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-p Pipe buffer (512 bytes) -q POSIX message queues
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-r Max realtime priority -R Realtime latency (us)
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-s Stack size (KiB) -t Total CPU time (s)
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-u Maximum processes (this UID) -v Virtual memory size (KiB)
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*/
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#define FOR_ulimit
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#include "toys.h"
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GLOBALS(
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long P;
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)
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// This is a linux kernel syscall added in 2.6.36 (git c022a0acad53) which
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// glibc only exports a wrapper prototype for if you #define _FSF_HURD_RULZE.
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int prlimit(pid_t pid, int resource, const struct rlimit *new_limit,
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struct rlimit *old_limit);
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// I'd like to sort the RLIMIT values 0-15, but mips, alpha and sparc
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// override the asm-generic values for 5-9, and alphabetical order is nice for
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// humans anyway.
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void ulimit_main(void)
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{
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struct rlimit rr;
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int i;
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// map and desc are in the same order as flags.
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// The Linux kernel implementation of RLIMIT_LOCKS (-x) was removed in 2003.
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char *flags="cdefilmnpqRrstuv";
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char map[] = {RLIMIT_CORE, RLIMIT_DATA, RLIMIT_NICE,
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RLIMIT_FSIZE, RLIMIT_SIGPENDING, RLIMIT_MEMLOCK,
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RLIMIT_RSS, RLIMIT_NOFILE, 0, RLIMIT_MSGQUEUE,
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RLIMIT_RTTIME, RLIMIT_RTPRIO, RLIMIT_STACK, RLIMIT_CPU, RLIMIT_NPROC,
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RLIMIT_AS};
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char *desc[]={"core dump size (blocks)", "data size (KiB)", "max nice",
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"file size (blocks)", "pending signals", "locked memory (KiB)",
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"RSS (KiB)", "open files", "pipe size (512 bytes)", "message queues",
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"RT time (us)", "RT priority", "stack (KiB)", "cpu time (s)", "processes",
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"address space (KiB)"};
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if (!(toys.optflags&(FLAG_H-1))) toys.optflags |= FLAG_f;
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if ((FLAG(a)||FLAG(p)) && toys.optc) error_exit("can't set -ap");
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// Fetch data
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if (!FLAG(P)) TT.P = getppid();
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for (i=0; i<sizeof(map); i++) {
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int get = toys.optflags&(FLAG_a|(1<<i));
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if (get && prlimit(TT.P, map[i], 0, &rr)) perror_exit("-%c", flags[i]);
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if (!toys.optc) {
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if (FLAG(a)) printf("-%c: %-25s ", flags[i], desc[i]);
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if (get) {
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if ((1<<i)&FLAG_p) {
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if (FLAG(H))
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xreadfile("/proc/sys/fs/pipe-max-size", toybuf, sizeof(toybuf));
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else {
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int pp[2];
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xpipe(pp);
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sprintf(toybuf, "%d\n", fcntl(*pp, F_GETPIPE_SZ));
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}
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printf("%s", toybuf);
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} else {
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rlim_t rl = FLAG(H) ? rr.rlim_max : rr.rlim_cur;
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if (rl == RLIM_INFINITY) printf("unlimited\n");
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else printf("%ld\n", (long)rl);
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}
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}
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}
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if (toys.optflags&(1<<i)) break;
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}
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if (FLAG(a)||FLAG(p)) return;
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if (toys.optc) {
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rlim_t val;
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if (tolower(**toys.optargs) == 'u') val = RLIM_INFINITY;
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else val = atolx_range(*toys.optargs, 0, LONG_MAX);
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if (FLAG(H)) rr.rlim_max = val;
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else rr.rlim_cur = val;
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if (prlimit(TT.P, map[i], &rr, 0)) perror_exit(0);
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}
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}
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