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tools/env: Serialize calls to fw_*env 

Use a lock file at /var/lock/fw_printenv.lock.
Avoids seriously confusing the MTD driver.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger 2012-10-03 09:38:49 +00:00 committed by Tom Rini
parent d9acae1a88
commit e4a223f04d
1 changed files with 37 additions and 22 deletions
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59
tools/env/fw_env_main.c vendored
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@ -39,10 +39,13 @@
* variable "name"
*/
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <sys/file.h>
#include <unistd.h>
#include "fw_env.h"
#define CMD_PRINTENV "fw_printenv"
@ -81,13 +84,27 @@ void usage(void)
);
}
int
main(int argc, char *argv[])
int main(int argc, char *argv[])
{
char *p;
char *cmdname = *argv;
char *script_file = NULL;
int c;
const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
int lockfd = -1;
int retval = EXIT_SUCCESS;
lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC);
if (-1 == lockfd) {
fprintf(stderr, "Error opening lock file %s\n", lockname);
return EXIT_FAILURE;
}
if (-1 == flock(lockfd, LOCK_EX)) {
fprintf(stderr, "Error locking file %s\n", lockname);
close(lockfd);
return EXIT_FAILURE;
}
if ((p = strrchr (cmdname, '/')) != NULL) {
cmdname = p + 1;
@ -104,38 +121,36 @@ main(int argc, char *argv[])
break;
case 'h':
usage();
return EXIT_SUCCESS;
goto exit;
default: /* '?' */
fprintf(stderr, "Try `%s --help' for more information."
"\n", cmdname);
return EXIT_FAILURE;
retval = EXIT_FAILURE;
goto exit;
}
}
if (strcmp(cmdname, CMD_PRINTENV) == 0) {
if (fw_printenv (argc, argv) != 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
if (fw_printenv(argc, argv) != 0)
retval = EXIT_FAILURE;
} else if (strcmp(cmdname, CMD_SETENV) == 0) {
if (!script_file) {
if (fw_setenv(argc, argv) != 0)
return EXIT_FAILURE;
retval = EXIT_FAILURE;
} else {
if (fw_parse_script(script_file) != 0)
return EXIT_FAILURE;
retval = EXIT_FAILURE;
}
return EXIT_SUCCESS;
} else {
fprintf(stderr,
"Identity crisis - may be called as `" CMD_PRINTENV
"' or as `" CMD_SETENV "' but not as `%s'\n",
cmdname);
retval = EXIT_FAILURE;
}
fprintf (stderr,
"Identity crisis - may be called as `" CMD_PRINTENV
"' or as `" CMD_SETENV "' but not as `%s'\n",
cmdname);
return EXIT_FAILURE;
exit:
flock(lockfd, LOCK_UN);
close(lockfd);
return retval;
}