1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Adapted from ash applet code
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4 | *
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5 | * This code is derived from software contributed to Berkeley by
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6 | * Kenneth Almquist.
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7 | *
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8 | * Copyright (c) 1989, 1991, 1993, 1994
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9 | * The Regents of the University of California. All rights reserved.
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10 | *
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11 | * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
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12 | * was re-ported from NetBSD and debianized.
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13 | *
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14 | * Copyright (c) 2010 Denys Vlasenko
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15 | * Split from ash.c
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16 | *
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17 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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18 | */
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19 | #include "libbb.h"
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20 | #include "shell_common.h"
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21 |
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22 | const char defifsvar[] ALIGN1 = "IFS= \t\n";
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23 |
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24 |
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25 | int FAST_FUNC is_well_formed_var_name(const char *s, char terminator)
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26 | {
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27 | if (!s || !(isalpha(*s) || *s == '_'))
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28 | return 0;
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29 |
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30 | do
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31 | s++;
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32 | while (isalnum(*s) || *s == '_');
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33 |
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34 | return *s == terminator;
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35 | }
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36 |
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37 | /* read builtin */
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38 |
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39 | //TODO: use more efficient setvar() which takes a pointer to malloced "VAR=VAL"
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40 | //string. hush naturally has it, and ash has setvareq().
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41 | //Here we can simply store "VAR=" at buffer start and store read data directly
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42 | //after "=", then pass buffer to setvar() to consume.
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43 | const char* FAST_FUNC
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44 | shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
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45 | char **argv,
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46 | const char *ifs,
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47 | int read_flags,
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48 | const char *opt_n,
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49 | const char *opt_p,
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50 | const char *opt_t,
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51 | const char *opt_u
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52 | )
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53 | {
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54 | unsigned end_ms; /* -t TIMEOUT */
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55 | int fd; /* -u FD */
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56 | int nchars; /* -n NUM */
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57 | char **pp;
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58 | char *buffer;
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59 | struct termios tty, old_tty;
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60 | const char *retval;
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61 | int bufpos; /* need to be able to hold -1 */
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62 | int startword;
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63 | smallint backslash;
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64 |
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65 | pp = argv;
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66 | while (*pp) {
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67 | if (!is_well_formed_var_name(*pp, '\0')) {
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68 | /* Mimic bash message */
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69 | bb_error_msg("read: '%s': not a valid identifier", *pp);
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70 | return (const char *)(uintptr_t)1;
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71 | }
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72 | pp++;
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73 | }
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74 |
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75 | nchars = 0; /* if != 0, -n is in effect */
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76 | if (opt_n) {
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77 | nchars = bb_strtou(opt_n, NULL, 10);
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78 | if (nchars < 0 || errno)
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79 | return "invalid count";
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80 | /* note: "-n 0": off (bash 3.2 does this too) */
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81 | }
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82 | end_ms = 0;
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83 | if (opt_t) {
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84 | end_ms = bb_strtou(opt_t, NULL, 10);
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85 | if (errno || end_ms > UINT_MAX / 2048)
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86 | return "invalid timeout";
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87 | end_ms *= 1000;
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88 | #if 0 /* even bash has no -t N.NNN support */
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89 | ts.tv_sec = bb_strtou(opt_t, &p, 10);
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90 | ts.tv_usec = 0;
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91 | /* EINVAL means number is ok, but not terminated by NUL */
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92 | if (*p == '.' && errno == EINVAL) {
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93 | char *p2;
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94 | if (*++p) {
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95 | int scale;
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96 | ts.tv_usec = bb_strtou(p, &p2, 10);
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97 | if (errno)
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98 | return "invalid timeout";
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99 | scale = p2 - p;
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100 | /* normalize to usec */
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101 | if (scale > 6)
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102 | return "invalid timeout";
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103 | while (scale++ < 6)
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104 | ts.tv_usec *= 10;
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105 | }
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106 | } else if (ts.tv_sec < 0 || errno) {
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107 | return "invalid timeout";
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108 | }
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109 | if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
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110 | return "invalid timeout";
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111 | }
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112 | #endif /* if 0 */
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113 | }
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114 | fd = STDIN_FILENO;
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115 | if (opt_u) {
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116 | fd = bb_strtou(opt_u, NULL, 10);
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117 | if (fd < 0 || errno)
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118 | return "invalid file descriptor";
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119 | }
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120 |
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121 | if (opt_p && isatty(fd)) {
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122 | fputs(opt_p, stderr);
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123 | fflush_all();
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124 | }
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125 |
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126 | if (ifs == NULL)
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127 | ifs = defifs;
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128 |
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129 | if (nchars || (read_flags & BUILTIN_READ_SILENT)) {
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130 | tcgetattr(fd, &tty);
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131 | old_tty = tty;
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132 | if (nchars) {
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133 | tty.c_lflag &= ~ICANON;
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134 | tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
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135 | }
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136 | if (read_flags & BUILTIN_READ_SILENT) {
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137 | tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
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138 | }
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139 | /* This forces execution of "restoring" tcgetattr later */
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140 | read_flags |= BUILTIN_READ_SILENT;
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141 | /* if tcgetattr failed, tcsetattr will fail too.
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142 | * Ignoring, it's harmless. */
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143 | tcsetattr(fd, TCSANOW, &tty);
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144 | }
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145 |
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146 | retval = (const char *)(uintptr_t)0;
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147 | startword = 1;
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148 | backslash = 0;
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149 | if (end_ms) /* NB: end_ms stays nonzero: */
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150 | end_ms = ((unsigned)monotonic_ms() + end_ms) | 1;
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151 | buffer = NULL;
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152 | bufpos = 0;
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153 | do {
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154 | char c;
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155 |
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156 | if (end_ms) {
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157 | int timeout;
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158 | struct pollfd pfd[1];
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159 |
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160 | pfd[0].fd = fd;
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161 | pfd[0].events = POLLIN;
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162 | timeout = end_ms - (unsigned)monotonic_ms();
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163 | if (timeout <= 0 /* already late? */
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164 | || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
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165 | ) { /* timed out! */
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166 | retval = (const char *)(uintptr_t)1;
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167 | goto ret;
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168 | }
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169 | }
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170 |
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171 | if ((bufpos & 0xff) == 0)
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172 | buffer = xrealloc(buffer, bufpos + 0x100);
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173 | if (nonblock_safe_read(fd, &buffer[bufpos], 1) != 1) {
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174 | retval = (const char *)(uintptr_t)1;
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175 | break;
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176 | }
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177 | c = buffer[bufpos];
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178 | if (c == '\0')
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179 | continue;
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180 | if (backslash) {
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181 | backslash = 0;
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182 | if (c != '\n')
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183 | goto put;
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184 | continue;
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185 | }
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186 | if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
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187 | backslash = 1;
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188 | continue;
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189 | }
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190 | if (c == '\n')
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191 | break;
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192 |
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193 | /* $IFS splitting. NOT done if we run "read"
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194 | * without variable names (bash compat).
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195 | * Thus, "read" and "read REPLY" are not the same.
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196 | */
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197 | if (argv[0]) {
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198 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
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199 | const char *is_ifs = strchr(ifs, c);
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200 | if (startword && is_ifs) {
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201 | if (isspace(c))
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202 | continue;
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203 | /* it is a non-space ifs char */
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204 | startword--;
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205 | if (startword == 1) /* first one? */
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206 | continue; /* yes, it is not next word yet */
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207 | }
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208 | startword = 0;
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209 | if (argv[1] != NULL && is_ifs) {
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210 | buffer[bufpos] = '\0';
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211 | bufpos = 0;
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212 | setvar(*argv, buffer);
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213 | argv++;
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214 | /* can we skip one non-space ifs char? (2: yes) */
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215 | startword = isspace(c) ? 2 : 1;
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216 | continue;
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217 | }
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218 | }
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219 | put:
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220 | bufpos++;
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221 | } while (--nchars);
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222 |
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223 | if (argv[0]) {
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224 | /* Remove trailing space $IFS chars */
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225 | while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
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226 | continue;
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227 | buffer[bufpos + 1] = '\0';
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228 | /* Use the remainder as a value for the next variable */
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229 | setvar(*argv, buffer);
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230 | /* Set the rest to "" */
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231 | while (*++argv)
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232 | setvar(*argv, "");
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233 | } else {
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234 | /* Note: no $IFS removal */
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235 | buffer[bufpos] = '\0';
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236 | setvar("REPLY", buffer);
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237 | }
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238 |
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239 | ret:
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240 | free(buffer);
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241 | if (read_flags & BUILTIN_READ_SILENT)
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242 | tcsetattr(fd, TCSANOW, &old_tty);
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243 | return retval;
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244 | }
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245 |
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246 | /* ulimit builtin */
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247 |
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248 | struct limits {
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249 | uint8_t cmd; /* RLIMIT_xxx fit into it */
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250 | uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
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251 | char option;
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252 | const char *name;
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253 | };
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254 |
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255 | static const struct limits limits_tbl[] = {
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256 | #ifdef RLIMIT_FSIZE
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257 | { RLIMIT_FSIZE, 9, 'f', "file size (blocks)" },
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258 | #endif
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259 | #ifdef RLIMIT_CPU
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260 | { RLIMIT_CPU, 0, 't', "cpu time (seconds)" },
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261 | #endif
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262 | #ifdef RLIMIT_DATA
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263 | { RLIMIT_DATA, 10, 'd', "data seg size (kb)" },
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264 | #endif
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265 | #ifdef RLIMIT_STACK
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266 | { RLIMIT_STACK, 10, 's', "stack size (kb)" },
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267 | #endif
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268 | #ifdef RLIMIT_CORE
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269 | { RLIMIT_CORE, 9, 'c', "core file size (blocks)" },
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270 | #endif
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271 | #ifdef RLIMIT_RSS
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272 | { RLIMIT_RSS, 10, 'm', "resident set size (kb)" },
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273 | #endif
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274 | #ifdef RLIMIT_MEMLOCK
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275 | { RLIMIT_MEMLOCK, 10, 'l', "locked memory (kb)" },
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276 | #endif
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277 | #ifdef RLIMIT_NPROC
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278 | { RLIMIT_NPROC, 0, 'p', "processes" },
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279 | #endif
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280 | #ifdef RLIMIT_NOFILE
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281 | { RLIMIT_NOFILE, 0, 'n', "file descriptors" },
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282 | #endif
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283 | #ifdef RLIMIT_AS
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284 | { RLIMIT_AS, 10, 'v', "address space (kb)" },
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285 | #endif
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286 | #ifdef RLIMIT_LOCKS
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287 | { RLIMIT_LOCKS, 0, 'w', "locks" },
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288 | #endif
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289 | };
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290 |
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291 | enum {
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292 | OPT_hard = (1 << 0),
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293 | OPT_soft = (1 << 1),
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294 | };
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295 |
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296 | /* "-": treat args as parameters of option with ASCII code 1 */
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297 | static const char ulimit_opt_string[] = "-HSa"
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298 | #ifdef RLIMIT_FSIZE
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299 | "f::"
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300 | #endif
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301 | #ifdef RLIMIT_CPU
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302 | "t::"
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303 | #endif
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304 | #ifdef RLIMIT_DATA
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305 | "d::"
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306 | #endif
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307 | #ifdef RLIMIT_STACK
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308 | "s::"
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309 | #endif
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310 | #ifdef RLIMIT_CORE
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311 | "c::"
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312 | #endif
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313 | #ifdef RLIMIT_RSS
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314 | "m::"
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315 | #endif
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316 | #ifdef RLIMIT_MEMLOCK
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317 | "l::"
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318 | #endif
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319 | #ifdef RLIMIT_NPROC
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320 | "p::"
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321 | #endif
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322 | #ifdef RLIMIT_NOFILE
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323 | "n::"
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324 | #endif
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325 | #ifdef RLIMIT_AS
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326 | "v::"
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327 | #endif
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328 | #ifdef RLIMIT_LOCKS
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329 | "w::"
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330 | #endif
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331 | ;
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332 |
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333 | static void printlim(unsigned opts, const struct rlimit *limit,
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334 | const struct limits *l)
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335 | {
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336 | rlim_t val;
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337 |
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338 | val = limit->rlim_max;
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339 | if (!(opts & OPT_hard))
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340 | val = limit->rlim_cur;
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341 |
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342 | if (val == RLIM_INFINITY)
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343 | printf("unlimited\n");
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344 | else {
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345 | val >>= l->factor_shift;
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346 | printf("%llu\n", (long long) val);
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347 | }
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348 | }
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349 |
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350 | int FAST_FUNC
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351 | shell_builtin_ulimit(char **argv)
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352 | {
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353 | unsigned opts;
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354 | unsigned argc;
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355 |
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356 | /* We can't use getopt32: need to handle commands like
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357 | * ulimit 123 -c2 -l 456
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358 | */
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359 |
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360 | /* In case getopt was already called:
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361 | * reset the libc getopt() function, which keeps internal state.
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362 | */
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363 | #ifdef __GLIBC__
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364 | optind = 0;
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365 | #else /* BSD style */
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366 | optind = 1;
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367 | /* optreset = 1; */
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368 | #endif
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369 | /* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
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370 |
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371 | argc = 1;
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372 | while (argv[argc])
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373 | argc++;
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374 |
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375 | opts = 0;
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376 | while (1) {
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377 | struct rlimit limit;
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378 | const struct limits *l;
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379 | int opt_char = getopt(argc, argv, ulimit_opt_string);
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380 |
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381 | if (opt_char == -1)
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382 | break;
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383 | if (opt_char == 'H') {
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384 | opts |= OPT_hard;
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385 | continue;
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386 | }
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387 | if (opt_char == 'S') {
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388 | opts |= OPT_soft;
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389 | continue;
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390 | }
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391 |
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392 | if (opt_char == 'a') {
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393 | for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
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394 | getrlimit(l->cmd, &limit);
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395 | printf("-%c: %-30s ", l->option, l->name);
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396 | printlim(opts, &limit, l);
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397 | }
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398 | continue;
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399 | }
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400 |
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401 | if (opt_char == 1)
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402 | opt_char = 'f';
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403 | for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
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404 | if (opt_char == l->option) {
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405 | char *val_str;
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406 |
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407 | getrlimit(l->cmd, &limit);
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408 |
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409 | val_str = optarg;
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410 | if (!val_str && argv[optind] && argv[optind][0] != '-')
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411 | val_str = argv[optind++]; /* ++ skips NN in "-c NN" case */
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412 | if (val_str) {
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413 | rlim_t val;
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414 |
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415 | if (strcmp(val_str, "unlimited") == 0)
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416 | val = RLIM_INFINITY;
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417 | else {
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418 | if (sizeof(val) == sizeof(int))
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419 | val = bb_strtou(val_str, NULL, 10);
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420 | else if (sizeof(val) == sizeof(long))
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421 | val = bb_strtoul(val_str, NULL, 10);
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422 | else
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423 | val = bb_strtoull(val_str, NULL, 10);
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424 | if (errno) {
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425 | bb_error_msg("invalid number '%s'", val_str);
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426 | return EXIT_FAILURE;
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427 | }
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428 | val <<= l->factor_shift;
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429 | }
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430 | //bb_error_msg("opt %c val_str:'%s' val:%lld", opt_char, val_str, (long long)val);
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431 | /* from man bash: "If neither -H nor -S
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432 | * is specified, both the soft and hard
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433 | * limits are set. */
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434 | if (!opts)
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435 | opts = OPT_hard + OPT_soft;
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436 | if (opts & OPT_hard)
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437 | limit.rlim_max = val;
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438 | if (opts & OPT_soft)
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439 | limit.rlim_cur = val;
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440 | //bb_error_msg("setrlimit(%d, %lld, %lld)", l->cmd, (long long)limit.rlim_cur, (long long)limit.rlim_max);
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441 | if (setrlimit(l->cmd, &limit) < 0) {
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442 | bb_perror_msg("error setting limit");
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443 | return EXIT_FAILURE;
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444 | }
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445 | } else {
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446 | printlim(opts, &limit, l);
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447 | }
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448 | break;
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449 | }
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450 | } /* for (every possible opt) */
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451 |
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452 | if (l == &limits_tbl[ARRAY_SIZE(limits_tbl)]) {
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453 | /* bad option. getopt already complained. */
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454 | break;
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455 | }
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456 |
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457 | } /* while (there are options) */
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458 |
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459 | return 0;
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460 | }
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