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function old new delta shell_builtin_ulimit 494 498 +4 Signed-off-by: Alexander Shishkin <virtuoso@slind.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
461 lines
10 KiB
C
461 lines
10 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Adapted from ash applet code
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
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* was re-ported from NetBSD and debianized.
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*
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* Copyright (c) 2010 Denys Vlasenko
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* Split from ash.c
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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#include "shell_common.h"
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const char defifsvar[] ALIGN1 = "IFS= \t\n";
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int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
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{
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if (!s || !(isalpha(*s) || *s == '_'))
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return 0;
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do
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s++;
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while (isalnum(*s) || *s == '_');
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return *s == terminator;
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}
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/* read builtin */
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//TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL"
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//string. hush naturally has it, and ash has setvareq().
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//Here we can simply store "VAR=" at buffer start and store read data directly
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//after "=", then pass buffer to setvar() to consume.
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const char* FAST_FUNC
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shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
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char **argv,
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const char *ifs,
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int read_flags,
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const char *opt_n,
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const char *opt_p,
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const char *opt_t,
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const char *opt_u
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)
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{
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unsigned end_ms; /* -t TIMEOUT */
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int fd; /* -u FD */
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int nchars; /* -n NUM */
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char **pp;
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char *buffer;
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struct termios tty, old_tty;
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const char *retval;
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int bufpos; /* need to be able to hold -1 */
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int startword;
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smallint backslash;
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pp = argv;
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while (*pp) {
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if (!is_well_formed_var_name(*pp, '\0')) {
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/* Mimic bash message */
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bb_error_msg("read: '%s': not a valid identifier", *pp);
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return (const char *)(uintptr_t)1;
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}
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pp++;
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}
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nchars = 0; /* if != 0, -n is in effect */
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if (opt_n) {
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nchars = bb_strtou(opt_n, NULL, 10);
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if (nchars < 0 || errno)
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return "invalid count";
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/* note: "-n 0": off (bash 3.2 does this too) */
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}
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end_ms = 0;
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if (opt_t) {
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end_ms = bb_strtou(opt_t, NULL, 10);
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if (errno || end_ms > UINT_MAX / 2048)
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return "invalid timeout";
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end_ms *= 1000;
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#if 0 /* even bash has no -t N.NNN support */
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ts.tv_sec = bb_strtou(opt_t, &p, 10);
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ts.tv_usec = 0;
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/* EINVAL means number is ok, but not terminated by NUL */
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if (*p == '.' && errno == EINVAL) {
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char *p2;
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if (*++p) {
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int scale;
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ts.tv_usec = bb_strtou(p, &p2, 10);
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if (errno)
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return "invalid timeout";
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scale = p2 - p;
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/* normalize to usec */
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if (scale > 6)
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return "invalid timeout";
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while (scale++ < 6)
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ts.tv_usec *= 10;
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}
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} else if (ts.tv_sec < 0 || errno) {
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return "invalid timeout";
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}
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if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
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return "invalid timeout";
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}
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#endif /* if 0 */
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}
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fd = STDIN_FILENO;
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if (opt_u) {
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fd = bb_strtou(opt_u, NULL, 10);
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if (fd < 0 || errno)
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return "invalid file descriptor";
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}
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if (opt_p && isatty(fd)) {
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fputs(opt_p, stderr);
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fflush_all();
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}
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if (ifs == NULL)
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ifs = defifs;
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if (nchars || (read_flags & BUILTIN_READ_SILENT)) {
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tcgetattr(fd, &tty);
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old_tty = tty;
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if (nchars) {
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tty.c_lflag &= ~ICANON;
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tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
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}
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if (read_flags & BUILTIN_READ_SILENT) {
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tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
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}
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/* This forces execution of "restoring" tcgetattr later */
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read_flags |= BUILTIN_READ_SILENT;
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/* if tcgetattr failed, tcsetattr will fail too.
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* Ignoring, it's harmless. */
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tcsetattr(fd, TCSANOW, &tty);
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}
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retval = (const char *)(uintptr_t)0;
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startword = 1;
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backslash = 0;
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if (end_ms) /* NB: end_ms stays nonzero: */
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end_ms = ((unsigned)monotonic_ms() + end_ms) | 1;
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buffer = NULL;
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bufpos = 0;
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do {
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char c;
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if (end_ms) {
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int timeout;
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struct pollfd pfd[1];
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pfd[0].fd = fd;
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pfd[0].events = POLLIN;
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timeout = end_ms - (unsigned)monotonic_ms();
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if (timeout <= 0 /* already late? */
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|| safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
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) { /* timed out! */
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retval = (const char *)(uintptr_t)1;
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goto ret;
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}
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}
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if ((bufpos & 0xff) == 0)
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buffer = xrealloc(buffer, bufpos + 0x100);
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if (nonblock_safe_read(fd, &buffer[bufpos], 1) != 1) {
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retval = (const char *)(uintptr_t)1;
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break;
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}
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c = buffer[bufpos];
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if (c == '\0')
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continue;
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if (backslash) {
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backslash = 0;
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if (c != '\n')
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goto put;
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continue;
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}
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if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
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backslash = 1;
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continue;
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}
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if (c == '\n')
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break;
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/* $IFS splitting. NOT done if we run "read"
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* without variable names (bash compat).
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* Thus, "read" and "read REPLY" are not the same.
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*/
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if (argv[0]) {
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/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
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const char *is_ifs = strchr(ifs, c);
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if (startword && is_ifs) {
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if (isspace(c))
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continue;
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/* it is a non-space ifs char */
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startword--;
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if (startword == 1) /* first one? */
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continue; /* yes, it is not next word yet */
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}
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startword = 0;
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if (argv[1] != NULL && is_ifs) {
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buffer[bufpos] = '\0';
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bufpos = 0;
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setvar(*argv, buffer);
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argv++;
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/* can we skip one non-space ifs char? (2: yes) */
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startword = isspace(c) ? 2 : 1;
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continue;
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}
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}
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put:
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bufpos++;
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} while (--nchars);
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if (argv[0]) {
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/* Remove trailing space $IFS chars */
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while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
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continue;
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buffer[bufpos + 1] = '\0';
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/* Use the remainder as a value for the next variable */
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setvar(*argv, buffer);
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/* Set the rest to "" */
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while (*++argv)
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setvar(*argv, "");
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} else {
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/* Note: no $IFS removal */
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buffer[bufpos] = '\0';
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setvar("REPLY", buffer);
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}
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ret:
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free(buffer);
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if (read_flags & BUILTIN_READ_SILENT)
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tcsetattr(fd, TCSANOW, &old_tty);
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return retval;
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}
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/* ulimit builtin */
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struct limits {
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uint8_t cmd; /* RLIMIT_xxx fit into it */
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uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
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char option;
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const char *name;
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};
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static const struct limits limits_tbl[] = {
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#ifdef RLIMIT_FSIZE
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{ RLIMIT_FSIZE, 9, 'f', "file size (blocks)" },
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#endif
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#ifdef RLIMIT_CPU
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{ RLIMIT_CPU, 0, 't', "cpu time (seconds)" },
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#endif
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#ifdef RLIMIT_DATA
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{ RLIMIT_DATA, 10, 'd', "data seg size (kb)" },
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#endif
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#ifdef RLIMIT_STACK
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{ RLIMIT_STACK, 10, 's', "stack size (kb)" },
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#endif
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#ifdef RLIMIT_CORE
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{ RLIMIT_CORE, 9, 'c', "core file size (blocks)" },
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#endif
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#ifdef RLIMIT_RSS
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{ RLIMIT_RSS, 10, 'm', "resident set size (kb)" },
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#endif
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#ifdef RLIMIT_MEMLOCK
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{ RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" },
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#endif
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#ifdef RLIMIT_NPROC
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{ RLIMIT_NPROC, 0, 'p', "processes" },
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#endif
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#ifdef RLIMIT_NOFILE
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{ RLIMIT_NOFILE, 0, 'n', "file descriptors" },
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#endif
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#ifdef RLIMIT_AS
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{ RLIMIT_AS, 10, 'v', "address space (kb)" },
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#endif
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#ifdef RLIMIT_LOCKS
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{ RLIMIT_LOCKS, 0, 'w', "locks" },
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#endif
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};
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enum {
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OPT_hard = (1 << 0),
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OPT_soft = (1 << 1),
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};
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/* "-": treat args as parameters of option with ASCII code 1 */
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static const char ulimit_opt_string[] = "-HSa"
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#ifdef RLIMIT_FSIZE
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"f::"
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#endif
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#ifdef RLIMIT_CPU
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"t::"
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#endif
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#ifdef RLIMIT_DATA
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"d::"
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#endif
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#ifdef RLIMIT_STACK
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"s::"
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#endif
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#ifdef RLIMIT_CORE
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"c::"
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#endif
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#ifdef RLIMIT_RSS
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"m::"
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#endif
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#ifdef RLIMIT_MEMLOCK
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"l::"
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#endif
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#ifdef RLIMIT_NPROC
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"p::"
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#endif
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#ifdef RLIMIT_NOFILE
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"n::"
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#endif
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#ifdef RLIMIT_AS
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"v::"
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#endif
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#ifdef RLIMIT_LOCKS
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"w::"
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#endif
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;
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static void printlim(unsigned opts, const struct rlimit *limit,
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const struct limits *l)
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{
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rlim_t val;
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val = limit->rlim_max;
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if (!(opts & OPT_hard))
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val = limit->rlim_cur;
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if (val == RLIM_INFINITY)
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printf("unlimited\n");
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else {
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val >>= l->factor_shift;
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printf("%llu\n", (long long) val);
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}
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}
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int FAST_FUNC
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shell_builtin_ulimit(char **argv)
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{
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unsigned opts;
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unsigned argc;
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/* We can't use getopt32: need to handle commands like
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* ulimit 123 -c2 -l 456
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*/
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/* In case getopt was already called:
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* reset the libc getopt() function, which keeps internal state.
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*/
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#ifdef __GLIBC__
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optind = 0;
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#else /* BSD style */
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optind = 1;
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/* optreset = 1; */
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#endif
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/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
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argc = 1;
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while (argv[argc])
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argc++;
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opts = 0;
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while (1) {
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struct rlimit limit;
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const struct limits *l;
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int opt_char = getopt(argc, argv, ulimit_opt_string);
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if (opt_char == -1)
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break;
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if (opt_char == 'H') {
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opts |= OPT_hard;
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continue;
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}
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if (opt_char == 'S') {
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opts |= OPT_soft;
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continue;
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}
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if (opt_char == 'a') {
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for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
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getrlimit(l->cmd, &limit);
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printf("-%c: %-30s ", l->option, l->name);
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printlim(opts, &limit, l);
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}
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continue;
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}
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if (opt_char == 1)
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opt_char = 'f';
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for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
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if (opt_char == l->option) {
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char *val_str;
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getrlimit(l->cmd, &limit);
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val_str = optarg;
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if (!val_str && argv[optind] && argv[optind][0] != '-')
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val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */
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if (val_str) {
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rlim_t val;
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if (strcmp(val_str, "unlimited") == 0)
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val = RLIM_INFINITY;
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else {
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if (sizeof(val) == sizeof(int))
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val = bb_strtou(val_str, NULL, 10);
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else if (sizeof(val) == sizeof(long))
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val = bb_strtoul(val_str, NULL, 10);
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else
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val = bb_strtoull(val_str, NULL, 10);
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if (errno) {
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bb_error_msg("bad number");
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return EXIT_FAILURE;
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}
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val <<= l->factor_shift;
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}
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//bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
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/* from man bash: "If neither -H nor -S
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* is specified, both the soft and hard
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* limits are set. */
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if (!opts)
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opts = OPT_hard + OPT_soft;
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if (opts & OPT_hard)
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limit.rlim_max = val;
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if (opts & OPT_soft)
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limit.rlim_cur = val;
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//bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
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if (setrlimit(l->cmd, &limit) < 0) {
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bb_perror_msg("error setting limit");
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return EXIT_FAILURE;
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}
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} else {
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printlim(opts, &limit, l);
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}
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break;
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}
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} /* for (every possible opt) */
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if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
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/* bad option. getopt already complained. */
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break;
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}
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} /* while (there are options) */
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return 0;
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}
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