| /* vi: set sw=4 ts=4: */ |
| /* |
| * Adapted from ash applet code |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Kenneth Almquist. |
| * |
| * Copyright (c) 1989, 1991, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au> |
| * was re-ported from NetBSD and debianized. |
| * |
| * Copyright (c) 2010 Denys Vlasenko |
| * Split from ash.c |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| #include "libbb.h" |
| #include "shell_common.h" |
| #include <sys/resource.h> /* getrlimit */ |
| |
| const char defifsvar[] ALIGN1 = "IFS= \t\n"; |
| |
| |
| int FAST_FUNC is_well_formed_var_name(const char *s, char terminator) |
| { |
| if (!s || !(isalpha(*s) || *s == '_')) |
| return 0; |
| |
| do |
| s++; |
| while (isalnum(*s) || *s == '_'); |
| |
| return *s == terminator; |
| } |
| |
| /* read builtin */ |
| |
| /* Needs to be interruptible: shell must handle traps and shell-special signals |
| * while inside read. To implement this, be sure to not loop on EINTR |
| * and return errno == EINTR reliably. |
| */ |
| //TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL" |
| //string. hush naturally has it, and ash has setvareq(). |
| //Here we can simply store "VAR=" at buffer start and store read data directly |
| //after "=", then pass buffer to setvar() to consume. |
| const char* FAST_FUNC |
| shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val), |
| char **argv, |
| const char *ifs, |
| int read_flags, |
| const char *opt_n, |
| const char *opt_p, |
| const char *opt_t, |
| const char *opt_u |
| ) |
| { |
| unsigned err; |
| unsigned end_ms; /* -t TIMEOUT */ |
| int fd; /* -u FD */ |
| int nchars; /* -n NUM */ |
| char **pp; |
| char *buffer; |
| struct termios tty, old_tty; |
| const char *retval; |
| int bufpos; /* need to be able to hold -1 */ |
| int startword; |
| smallint backslash; |
| |
| errno = err = 0; |
| |
| pp = argv; |
| while (*pp) { |
| if (!is_well_formed_var_name(*pp, '\0')) { |
| /* Mimic bash message */ |
| bb_error_msg("read: '%s': not a valid identifier", *pp); |
| return (const char *)(uintptr_t)1; |
| } |
| pp++; |
| } |
| |
| nchars = 0; /* if != 0, -n is in effect */ |
| if (opt_n) { |
| nchars = bb_strtou(opt_n, NULL, 10); |
| if (nchars < 0 || errno) |
| return "invalid count"; |
| /* note: "-n 0": off (bash 3.2 does this too) */ |
| } |
| end_ms = 0; |
| if (opt_t) { |
| end_ms = bb_strtou(opt_t, NULL, 10); |
| if (errno || end_ms > UINT_MAX / 2048) |
| return "invalid timeout"; |
| end_ms *= 1000; |
| #if 0 /* even bash has no -t N.NNN support */ |
| ts.tv_sec = bb_strtou(opt_t, &p, 10); |
| ts.tv_usec = 0; |
| /* EINVAL means number is ok, but not terminated by NUL */ |
| if (*p == '.' && errno == EINVAL) { |
| char *p2; |
| if (*++p) { |
| int scale; |
| ts.tv_usec = bb_strtou(p, &p2, 10); |
| if (errno) |
| return "invalid timeout"; |
| scale = p2 - p; |
| /* normalize to usec */ |
| if (scale > 6) |
| return "invalid timeout"; |
| while (scale++ < 6) |
| ts.tv_usec *= 10; |
| } |
| } else if (ts.tv_sec < 0 || errno) { |
| return "invalid timeout"; |
| } |
| if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */ |
| return "invalid timeout"; |
| } |
| #endif /* if 0 */ |
| } |
| fd = STDIN_FILENO; |
| if (opt_u) { |
| fd = bb_strtou(opt_u, NULL, 10); |
| if (fd < 0 || errno) |
| return "invalid file descriptor"; |
| } |
| |
| if (opt_p && isatty(fd)) { |
| fputs(opt_p, stderr); |
| fflush_all(); |
| } |
| |
| if (ifs == NULL) |
| ifs = defifs; |
| |
| if (nchars || (read_flags & BUILTIN_READ_SILENT)) { |
| tcgetattr(fd, &tty); |
| old_tty = tty; |
| if (nchars) { |
| tty.c_lflag &= ~ICANON; |
| // Setting it to more than 1 breaks poll(): |
| // it blocks even if there's data. !?? |
| //tty.c_cc[VMIN] = nchars < 256 ? nchars : 255; |
| /* reads would block only if < 1 char is available */ |
| tty.c_cc[VMIN] = 1; |
| /* no timeout (reads block forever) */ |
| tty.c_cc[VTIME] = 0; |
| } |
| if (read_flags & BUILTIN_READ_SILENT) { |
| tty.c_lflag &= ~(ECHO | ECHOK | ECHONL); |
| } |
| /* This forces execution of "restoring" tcgetattr later */ |
| read_flags |= BUILTIN_READ_SILENT; |
| /* if tcgetattr failed, tcsetattr will fail too. |
| * Ignoring, it's harmless. */ |
| tcsetattr(fd, TCSANOW, &tty); |
| } |
| |
| retval = (const char *)(uintptr_t)0; |
| startword = 1; |
| backslash = 0; |
| if (end_ms) /* NB: end_ms stays nonzero: */ |
| end_ms = ((unsigned)monotonic_ms() + end_ms) | 1; |
| buffer = NULL; |
| bufpos = 0; |
| do { |
| char c; |
| struct pollfd pfd[1]; |
| int timeout; |
| |
| if ((bufpos & 0xff) == 0) |
| buffer = xrealloc(buffer, bufpos + 0x101); |
| |
| timeout = -1; |
| if (end_ms) { |
| timeout = end_ms - (unsigned)monotonic_ms(); |
| if (timeout <= 0) { /* already late? */ |
| retval = (const char *)(uintptr_t)1; |
| goto ret; |
| } |
| } |
| |
| /* We must poll even if timeout is -1: |
| * we want to be interrupted if signal arrives, |
| * regardless of SA_RESTART-ness of that signal! |
| */ |
| errno = 0; |
| pfd[0].fd = fd; |
| pfd[0].events = POLLIN; |
| if (poll(pfd, 1, timeout) != 1) { |
| /* timed out, or EINTR */ |
| err = errno; |
| retval = (const char *)(uintptr_t)1; |
| goto ret; |
| } |
| if (read(fd, &buffer[bufpos], 1) != 1) { |
| err = errno; |
| retval = (const char *)(uintptr_t)1; |
| break; |
| } |
| |
| c = buffer[bufpos]; |
| if (c == '\0') |
| continue; |
| if (backslash) { |
| backslash = 0; |
| if (c != '\n') |
| goto put; |
| continue; |
| } |
| if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') { |
| backslash = 1; |
| continue; |
| } |
| if (c == '\n') |
| break; |
| |
| /* $IFS splitting. NOT done if we run "read" |
| * without variable names (bash compat). |
| * Thus, "read" and "read REPLY" are not the same. |
| */ |
| if (argv[0]) { |
| /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */ |
| const char *is_ifs = strchr(ifs, c); |
| if (startword && is_ifs) { |
| if (isspace(c)) |
| continue; |
| /* it is a non-space ifs char */ |
| startword--; |
| if (startword == 1) /* first one? */ |
| continue; /* yes, it is not next word yet */ |
| } |
| startword = 0; |
| if (argv[1] != NULL && is_ifs) { |
| buffer[bufpos] = '\0'; |
| bufpos = 0; |
| setvar(*argv, buffer); |
| argv++; |
| /* can we skip one non-space ifs char? (2: yes) */ |
| startword = isspace(c) ? 2 : 1; |
| continue; |
| } |
| } |
| put: |
| bufpos++; |
| } while (--nchars); |
| |
| if (argv[0]) { |
| /* Remove trailing space $IFS chars */ |
| while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL) |
| continue; |
| buffer[bufpos + 1] = '\0'; |
| /* Use the remainder as a value for the next variable */ |
| setvar(*argv, buffer); |
| /* Set the rest to "" */ |
| while (*++argv) |
| setvar(*argv, ""); |
| } else { |
| /* Note: no $IFS removal */ |
| buffer[bufpos] = '\0'; |
| setvar("REPLY", buffer); |
| } |
| |
| ret: |
| free(buffer); |
| if (read_flags & BUILTIN_READ_SILENT) |
| tcsetattr(fd, TCSANOW, &old_tty); |
| |
| errno = err; |
| return retval; |
| } |
| |
| /* ulimit builtin */ |
| |
| struct limits { |
| uint8_t cmd; /* RLIMIT_xxx fit into it */ |
| uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */ |
| char option; |
| const char *name; |
| }; |
| |
| static const struct limits limits_tbl[] = { |
| #ifdef RLIMIT_FSIZE |
| { RLIMIT_FSIZE, 9, 'f', "file size (blocks)" }, |
| #endif |
| #ifdef RLIMIT_CPU |
| { RLIMIT_CPU, 0, 't', "cpu time (seconds)" }, |
| #endif |
| #ifdef RLIMIT_DATA |
| { RLIMIT_DATA, 10, 'd', "data seg size (kb)" }, |
| #endif |
| #ifdef RLIMIT_STACK |
| { RLIMIT_STACK, 10, 's', "stack size (kb)" }, |
| #endif |
| #ifdef RLIMIT_CORE |
| { RLIMIT_CORE, 9, 'c', "core file size (blocks)" }, |
| #endif |
| #ifdef RLIMIT_RSS |
| { RLIMIT_RSS, 10, 'm', "resident set size (kb)" }, |
| #endif |
| #ifdef RLIMIT_MEMLOCK |
| { RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" }, |
| #endif |
| #ifdef RLIMIT_NPROC |
| { RLIMIT_NPROC, 0, 'p', "processes" }, |
| #endif |
| #ifdef RLIMIT_NOFILE |
| { RLIMIT_NOFILE, 0, 'n', "file descriptors" }, |
| #endif |
| #ifdef RLIMIT_AS |
| { RLIMIT_AS, 10, 'v', "address space (kb)" }, |
| #endif |
| #ifdef RLIMIT_LOCKS |
| { RLIMIT_LOCKS, 0, 'w', "locks" }, |
| #endif |
| #ifdef RLIMIT_NICE |
| { RLIMIT_NICE, 0, 'e', "scheduling priority" }, |
| #endif |
| #ifdef RLIMIT_RTPRIO |
| { RLIMIT_RTPRIO, 0, 'r', "real-time priority" }, |
| #endif |
| }; |
| |
| enum { |
| OPT_hard = (1 << 0), |
| OPT_soft = (1 << 1), |
| }; |
| |
| /* "-": treat args as parameters of option with ASCII code 1 */ |
| static const char ulimit_opt_string[] ALIGN1 = "-HSa" |
| #ifdef RLIMIT_FSIZE |
| "f::" |
| #endif |
| #ifdef RLIMIT_CPU |
| "t::" |
| #endif |
| #ifdef RLIMIT_DATA |
| "d::" |
| #endif |
| #ifdef RLIMIT_STACK |
| "s::" |
| #endif |
| #ifdef RLIMIT_CORE |
| "c::" |
| #endif |
| #ifdef RLIMIT_RSS |
| "m::" |
| #endif |
| #ifdef RLIMIT_MEMLOCK |
| "l::" |
| #endif |
| #ifdef RLIMIT_NPROC |
| "p::" |
| #endif |
| #ifdef RLIMIT_NOFILE |
| "n::" |
| #endif |
| #ifdef RLIMIT_AS |
| "v::" |
| #endif |
| #ifdef RLIMIT_LOCKS |
| "w::" |
| #endif |
| #ifdef RLIMIT_NICE |
| "e::" |
| #endif |
| #ifdef RLIMIT_RTPRIO |
| "r::" |
| #endif |
| ; |
| |
| static void printlim(unsigned opts, const struct rlimit *limit, |
| const struct limits *l) |
| { |
| rlim_t val; |
| |
| val = limit->rlim_max; |
| if (!(opts & OPT_hard)) |
| val = limit->rlim_cur; |
| |
| if (val == RLIM_INFINITY) |
| puts("unlimited"); |
| else { |
| val >>= l->factor_shift; |
| printf("%llu\n", (long long) val); |
| } |
| } |
| |
| int FAST_FUNC |
| shell_builtin_ulimit(char **argv) |
| { |
| unsigned opts; |
| unsigned argc; |
| |
| /* We can't use getopt32: need to handle commands like |
| * ulimit 123 -c2 -l 456 |
| */ |
| |
| /* In case getopt was already called: |
| * reset the libc getopt() function, which keeps internal state. |
| */ |
| #ifdef __GLIBC__ |
| optind = 0; |
| #else /* BSD style */ |
| optind = 1; |
| /* optreset = 1; */ |
| #endif |
| /* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */ |
| |
| argc = 1; |
| while (argv[argc]) |
| argc++; |
| |
| opts = 0; |
| while (1) { |
| struct rlimit limit; |
| const struct limits *l; |
| int opt_char = getopt(argc, argv, ulimit_opt_string); |
| |
| if (opt_char == -1) |
| break; |
| if (opt_char == 'H') { |
| opts |= OPT_hard; |
| continue; |
| } |
| if (opt_char == 'S') { |
| opts |= OPT_soft; |
| continue; |
| } |
| |
| if (opt_char == 'a') { |
| for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) { |
| getrlimit(l->cmd, &limit); |
| printf("-%c: %-30s ", l->option, l->name); |
| printlim(opts, &limit, l); |
| } |
| continue; |
| } |
| |
| if (opt_char == 1) |
| opt_char = 'f'; |
| for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) { |
| if (opt_char == l->option) { |
| char *val_str; |
| |
| getrlimit(l->cmd, &limit); |
| |
| val_str = optarg; |
| if (!val_str && argv[optind] && argv[optind][0] != '-') |
| val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */ |
| if (val_str) { |
| rlim_t val; |
| |
| if (strcmp(val_str, "unlimited") == 0) |
| val = RLIM_INFINITY; |
| else { |
| if (sizeof(val) == sizeof(int)) |
| val = bb_strtou(val_str, NULL, 10); |
| else if (sizeof(val) == sizeof(long)) |
| val = bb_strtoul(val_str, NULL, 10); |
| else |
| val = bb_strtoull(val_str, NULL, 10); |
| if (errno) { |
| bb_error_msg("invalid number '%s'", val_str); |
| return EXIT_FAILURE; |
| } |
| val <<= l->factor_shift; |
| } |
| //bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val); |
| /* from man bash: "If neither -H nor -S |
| * is specified, both the soft and hard |
| * limits are set. */ |
| if (!opts) |
| opts = OPT_hard + OPT_soft; |
| if (opts & OPT_hard) |
| limit.rlim_max = val; |
| if (opts & OPT_soft) |
| limit.rlim_cur = val; |
| //bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max); |
| if (setrlimit(l->cmd, &limit) < 0) { |
| bb_perror_msg("error setting limit"); |
| return EXIT_FAILURE; |
| } |
| } else { |
| printlim(opts, &limit, l); |
| } |
| break; |
| } |
| } /* for (every possible opt) */ |
| |
| if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) { |
| /* bad option. getopt already complained. */ |
| break; |
| } |
| } /* while (there are options) */ |
| |
| return 0; |
| } |