2 * Shell-like utility functions
4 * Copyright 2004, Broadcom Corporation
7 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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25 #include <sys/types.h>
29 #include <sys/ioctl.h>
31 #include <net/ethernet.h>
36 * Reads file and returns contents
37 * @param fd file descriptor
38 * @return contents of file or NULL if an error occurred
47 buf
= realloc(buf
, count
+ 512);
48 n
= read(fd
, buf
+ count
, 512);
63 * Reads file and returns contents
64 * @param path path to file
65 * @return contents of file or NULL if an error occurred
68 file2str(const char *path
)
72 if ((fd
= open(path
, O_RDONLY
)) == -1) {
81 * Waits for a file descriptor to change status or unblocked signal
82 * @param fd file descriptor
83 * @param timeout seconds to wait before timing out or 0 for no timeout
84 * @return 1 if descriptor changed status or 0 if timed out or -1 on error
87 waitfor(int fd
, int timeout
)
90 struct timeval tv
= { timeout
, 0 };
94 return select(fd
+ 1, &rfds
, NULL
, NULL
, (timeout
> 0) ? &tv
: NULL
);
98 * Concatenates NULL-terminated list of arguments into a single
99 * commmand and executes it
100 * @param argv argument list
101 * @param path NULL, ">output", or ">>output"
102 * @param timeout seconds to wait before timing out or 0 for no timeout
103 * @param ppid NULL to wait for child termination or pointer to pid
104 * @return return value of executed command or errno
107 _eval(char *const argv
[], char *path
, int timeout
, int *ppid
)
117 switch (pid
= fork()) {
122 /* Reset signal handlers set for parent process */
123 for (sig
= 0; sig
< (_NSIG
-1); sig
++)
124 signal(sig
, SIG_DFL
);
127 ioctl(0, TIOCNOTTY
, 0);
129 close(STDOUT_FILENO
);
130 close(STDERR_FILENO
);
133 /* We want to check the board if exist UART? , add by honor 2003-12-04 */
134 if ((fd
= open("/dev/console", O_RDWR
)) < 0) {
135 (void) open("/dev/null", O_RDONLY
);
136 (void) open("/dev/null", O_WRONLY
);
137 (void) open("/dev/null", O_WRONLY
);
141 (void) open("/dev/console", O_RDONLY
);
142 (void) open("/dev/console", O_WRONLY
);
143 (void) open("/dev/console", O_WRONLY
);
146 /* Redirect stdout to <path> */
148 flags
= O_WRONLY
| O_CREAT
;
149 if (!strncmp(path
, ">>", 2)) {
150 /* append to <path> */
153 } else if (!strncmp(path
, ">", 1)) {
154 /* overwrite <path> */
158 if ((fd
= open(path
, flags
, 0644)) < 0)
161 dup2(fd
, STDOUT_FILENO
);
166 /* execute command */
167 for(i
=0 ; argv
[i
] ; i
++)
168 snprintf(buf
+strlen(buf
), sizeof(buf
), "%s ", argv
[i
]);
169 dprintf("cmd=[%s]\n", buf
);
170 setenv("PATH", "/sbin:/bin:/usr/sbin:/usr/bin", 1);
172 execvp(argv
[0], argv
);
175 default: /* parent */
180 waitpid(pid
, &status
, 0);
181 if (WIFEXITED(status
))
182 return WEXITSTATUS(status
);
190 * Concatenates NULL-terminated list of arguments into a single
191 * commmand and executes it
192 * @param argv argument list
193 * @return stdout of executed command or NULL if an error occurred
196 _backtick(char *const argv
[])
204 if (pipe(filedes
) == -1) {
209 switch (pid
= fork()) {
213 close(filedes
[0]); /* close read end of pipe */
214 dup2(filedes
[1], 1); /* redirect stdout to write end of pipe */
215 close(filedes
[1]); /* close write end of pipe */
216 execvp(argv
[0], argv
);
219 default: /* parent */
220 close(filedes
[1]); /* close write end of pipe */
221 buf
= fd2str(filedes
[0]);
222 waitpid(pid
, &status
, 0);
230 * Kills process whose PID is stored in plaintext in pidfile
231 * @param pidfile PID file
232 * @return 0 on success and errno on failure
235 kill_pidfile(char *pidfile
)
237 FILE *fp
= fopen(pidfile
, "r");
240 if (fp
&& fgets(buf
, sizeof(buf
), fp
)) {
241 pid_t pid
= strtoul(buf
, NULL
, 0);
243 return kill(pid
, SIGTERM
);
249 * fread() with automatic retry on syscall interrupt
250 * @param ptr location to store to
251 * @param size size of each element of data
252 * @param nmemb number of elements
253 * @param stream file stream
254 * @return number of items successfully read
257 safe_fread(void *ptr
, size_t size
, size_t nmemb
, FILE *stream
)
263 ret
+= fread((char *)ptr
+ (ret
* size
), size
, nmemb
- ret
, stream
);
264 } while (ret
< nmemb
&& ferror(stream
) && errno
== EINTR
);
270 * fwrite() with automatic retry on syscall interrupt
271 * @param ptr location to read from
272 * @param size size of each element of data
273 * @param nmemb number of elements
274 * @param stream file stream
275 * @return number of items successfully written
278 safe_fwrite(const void *ptr
, size_t size
, size_t nmemb
, FILE *stream
)
284 ret
+= fwrite((char *)ptr
+ (ret
* size
), size
, nmemb
- ret
, stream
);
285 } while (ret
< nmemb
&& ferror(stream
) && errno
== EINTR
);
291 * Convert Ethernet address string representation to binary data
292 * @param a string in xx:xx:xx:xx:xx:xx notation
293 * @param e binary data
294 * @return TRUE if conversion was successful and FALSE otherwise
297 ether_atoe(const char *a
, unsigned char *e
)
299 char *c
= (char *) a
;
302 memset(e
, 0, ETHER_ADDR_LEN
);
304 e
[i
++] = (unsigned char) strtoul(c
, &c
, 16);
305 if (!*c
++ || i
== ETHER_ADDR_LEN
)
308 return (i
== ETHER_ADDR_LEN
);
312 * Convert Ethernet address binary data to string representation
313 * @param e binary data
314 * @param a string in xx:xx:xx:xx:xx:xx notation
318 ether_etoa(const unsigned char *e
, char *a
)
323 for (i
= 0; i
< ETHER_ADDR_LEN
; i
++) {
326 c
+= sprintf(c
, "%02X", e
[i
] & 0xff);
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