[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | #include <sys/types.h>
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| 11 | #include <sys/stat.h>
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| 12 | #include <sys/wait.h>
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| 13 | #include <stdio.h>
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| 14 | #include <string.h>
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| 15 | #include <stdlib.h>
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| 16 | #include <unistd.h>
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| 17 | #include <fcntl.h>
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| 18 | #include "busybox.h"
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| 19 |
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| 20 | #ifndef DMALLOC
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| 21 | #ifdef L_xmalloc
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| 22 | void *xmalloc(size_t size)
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| 23 | {
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| 24 | void *ptr = malloc(size);
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| 25 | if (ptr == NULL && size != 0)
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| 26 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 27 | return ptr;
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| 28 | }
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| 29 | #endif
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| 30 |
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| 31 | #ifdef L_xrealloc
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| 32 | void *xrealloc(void *ptr, size_t size)
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| 33 | {
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| 34 | ptr = realloc(ptr, size);
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| 35 | if (ptr == NULL && size != 0)
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| 36 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 37 | return ptr;
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| 38 | }
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| 39 | #endif
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| 40 |
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| 41 | #ifdef L_xzalloc
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| 42 | void *xzalloc(size_t size)
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| 43 | {
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| 44 | void *ptr = xmalloc(size);
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| 45 | memset(ptr, 0, size);
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| 46 | return ptr;
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| 47 | }
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| 48 | #endif
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| 49 |
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| 50 | #ifdef L_xcalloc
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| 51 | void *xcalloc(size_t nmemb, size_t size)
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| 52 | {
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| 53 | void *ptr = calloc(nmemb, size);
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| 54 | if (ptr == NULL && nmemb != 0 && size != 0)
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| 55 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 56 | return ptr;
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| 57 | }
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| 58 | #endif
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| 59 | #endif /* DMALLOC */
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| 60 |
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| 61 | #ifdef L_xstrdup
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| 62 | char * bb_xstrdup (const char *s)
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| 63 | {
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| 64 | char *t;
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| 65 |
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| 66 | if (s == NULL)
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| 67 | return NULL;
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| 68 |
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| 69 | t = strdup (s);
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| 70 |
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| 71 | if (t == NULL)
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| 72 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 73 |
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| 74 | return t;
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| 75 | }
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| 76 | #endif
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| 77 |
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| 78 | #ifdef L_xstrndup
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| 79 | char * bb_xstrndup (const char *s, int n)
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| 80 | {
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| 81 | char *t;
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| 82 |
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| 83 | if (ENABLE_DEBUG && s == NULL)
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| 84 | bb_error_msg_and_die("bb_xstrndup bug");
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| 85 |
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| 86 | t = xmalloc(++n);
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| 87 |
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| 88 | return safe_strncpy(t,s,n);
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| 89 | }
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| 90 | #endif
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| 91 |
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| 92 | #ifdef L_xfopen
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| 93 | FILE *bb_xfopen(const char *path, const char *mode)
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| 94 | {
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| 95 | FILE *fp;
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| 96 | if ((fp = fopen(path, mode)) == NULL)
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| 97 | bb_perror_msg_and_die("%s", path);
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| 98 | return fp;
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| 99 | }
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| 100 | #endif
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| 101 |
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| 102 | #ifdef L_xopen
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| 103 | int bb_xopen(const char *pathname, int flags)
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| 104 | {
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| 105 | return bb_xopen3(pathname, flags, 0777);
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| 106 | }
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| 107 | #endif
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| 108 |
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| 109 | #ifdef L_xopen3
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| 110 | int bb_xopen3(const char *pathname, int flags, int mode)
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| 111 | {
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| 112 | int ret;
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| 113 |
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| 114 | ret = open(pathname, flags, mode);
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| 115 | if (ret < 0) {
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| 116 | bb_perror_msg_and_die("%s", pathname);
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| 117 | }
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| 118 | return ret;
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| 119 | }
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| 120 | #endif
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| 121 |
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| 122 | #ifdef L_xread
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| 123 | ssize_t bb_xread(int fd, void *buf, size_t count)
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| 124 | {
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| 125 | ssize_t size;
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| 126 |
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| 127 | size = read(fd, buf, count);
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| 128 | if (size < 0) {
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| 129 | bb_perror_msg_and_die(bb_msg_read_error);
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| 130 | }
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| 131 | return(size);
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| 132 | }
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| 133 | #endif
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| 134 |
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| 135 | #ifdef L_xread_all
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| 136 | void bb_xread_all(int fd, void *buf, size_t count)
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| 137 | {
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| 138 | ssize_t size;
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| 139 |
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| 140 | while (count) {
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| 141 | if ((size = bb_xread(fd, buf, count)) == 0) { /* EOF */
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| 142 | bb_error_msg_and_die("Short read");
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| 143 | }
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| 144 | count -= size;
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| 145 | buf = ((char *) buf) + size;
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| 146 | }
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| 147 | return;
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| 148 | }
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| 149 | #endif
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| 150 |
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| 151 | #ifdef L_xread_char
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| 152 | unsigned char bb_xread_char(int fd)
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| 153 | {
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| 154 | char tmp;
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| 155 |
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| 156 | bb_xread_all(fd, &tmp, 1);
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| 157 |
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| 158 | return(tmp);
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| 159 | }
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| 160 | #endif
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| 161 |
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| 162 | #ifdef L_xferror
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| 163 | void bb_xferror(FILE *fp, const char *fn)
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| 164 | {
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| 165 | if (ferror(fp)) {
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| 166 | bb_error_msg_and_die("%s", fn);
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| 167 | }
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| 168 | }
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| 169 | #endif
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| 170 |
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| 171 | #ifdef L_xferror_stdout
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| 172 | void bb_xferror_stdout(void)
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| 173 | {
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| 174 | bb_xferror(stdout, bb_msg_standard_output);
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| 175 | }
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| 176 | #endif
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| 177 |
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| 178 | #ifdef L_xfflush_stdout
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| 179 | void bb_xfflush_stdout(void)
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| 180 | {
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| 181 | if (fflush(stdout)) {
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| 182 | bb_perror_msg_and_die(bb_msg_standard_output);
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| 183 | }
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| 184 | }
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| 185 | #endif
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| 186 |
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| 187 | #ifdef L_spawn
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| 188 | // This does a fork/exec in one call, using vfork().
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| 189 | pid_t bb_spawn(char **argv)
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| 190 | {
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| 191 | static int failed;
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| 192 | pid_t pid;
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| 193 | void *app = find_applet_by_name(argv[0]);
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| 194 |
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| 195 | // Be nice to nommu machines.
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| 196 | failed = 0;
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| 197 | pid = vfork();
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| 198 | if (pid < 0) return pid;
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| 199 | if (!pid) {
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| 200 | execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
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| 201 |
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| 202 | // We're sharing a stack with blocked parent, let parent know we failed
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| 203 | // and then exit to unblock parent (but don't run atexit() stuff, which
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| 204 | // would screw up parent.)
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| 205 |
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| 206 | failed = -1;
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| 207 | _exit(0);
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| 208 | }
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| 209 | return failed ? failed : pid;
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| 210 | }
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| 211 | #endif
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| 212 |
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| 213 | #ifdef L_xspawn
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| 214 | pid_t bb_xspawn(char **argv)
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| 215 | {
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| 216 | pid_t pid = bb_spawn(argv);
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| 217 | if (pid < 0) bb_perror_msg_and_die("%s", *argv);
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| 218 | return pid;
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| 219 | }
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| 220 | #endif
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| 221 |
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| 222 | #ifdef L_wait4
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| 223 | int wait4pid(int pid)
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| 224 | {
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| 225 | int status;
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| 226 |
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| 227 | if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
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| 228 | if (WIFEXITED(status)) return WEXITSTATUS(status);
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| 229 | if (WIFSIGNALED(status)) return WTERMSIG(status);
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| 230 | return 0;
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| 231 | }
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| 232 | #endif
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| 233 |
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| 234 | #ifdef L_setuid
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| 235 | void xsetgid(gid_t gid)
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| 236 | {
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| 237 | if (setgid(gid)) bb_error_msg_and_die("setgid");
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| 238 | }
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| 239 |
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| 240 | void xsetuid(uid_t uid)
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| 241 | {
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| 242 | if (setuid(uid)) bb_error_msg_and_die("setuid");
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| 243 | }
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| 244 | #endif
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