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#include <sys/types.h>
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2
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <limits.h>
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static int
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convert_int(int *val, char *str)
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{
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long lval;
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if (str == NULL || !isdigit(*str))
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return (-1);
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lval = strtol(str, &str, 10);
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if (*str != '\0' || lval > INT_MAX)
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return (-2);
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*val = (int)lval;
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return (0);
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}
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void
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lock_cmd_usage(void) {
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printf("Usage: lock r|R|w|W|u|U start len filename\n");
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}
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void
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test_cmd_usage(void) {
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printf("Usage: test r|w|u start len filename\n");
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}
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int
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locktest_cmd(int argc, char *argv[])
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{
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int f;
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struct flock fl;
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int cmd;
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int t;
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void (*usage_fnc)(void);
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if (argc < 1)
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return -1;
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if (strcmp(argv[0], "lock") == 0) {
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usage_fnc = lock_cmd_usage;
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cmd = F_SETLK;
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} else if (strcmp(argv[0], "test") == 0) {
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usage_fnc = test_cmd_usage;
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cmd = F_GETLK;
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} else {
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return -1;
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}
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if (argc != 5 || strlen(argv[1]) != 1) {
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usage_fnc();
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return -1;
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}
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f = open(argv[4], O_RDWR | O_CREAT, 0777);
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if (f == -1) {
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printf("open failed\n");
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return -1;
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}
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switch (argv[1][0]) {
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case 'r':
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case 'w':
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case 'u': break;
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case 'R':
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case 'W':
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case 'U':
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if (cmd == F_SETLK) {
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cmd = F_SETLKW;
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break;
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}
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default: usage_fnc(); return -1;
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}
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switch (argv[1][0]) {
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case 'r':
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case 'R': fl.l_type = F_RDLCK; break;
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case 'w':
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case 'W': fl.l_type = F_WRLCK; break;
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case 'u':
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case 'U': fl.l_type = F_UNLCK; break;
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default: usage_fnc(); return -1;
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}
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fl.l_whence = SEEK_SET;
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if (convert_int(&t, argv[2]) != 0) {
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usage_fnc(); return -1;
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}
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fl.l_start = t;
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if (convert_int(&t, argv[3]) != 0) {
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usage_fnc(); return -1;
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}
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fl.l_len = t;
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if (fcntl(f, cmd, &fl) == -1) {
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printf("fcntl failed\n");
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return 0;
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}
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if (cmd == F_GETLK) {
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char *s;
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switch (fl.l_type) {
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case F_WRLCK: s = "F_WRLCK"; break;
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case F_RDLCK: s = "F_RDLCK"; break;
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case F_UNLCK: s = "F_UNLCK"; break;
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default: s = "unknown"; break;
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}
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printf("F_GETLK: %s %ld %ld\n", s, fl.l_start, fl.l_len);
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}
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return 0;
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}
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int
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sleep_cmd(int argc, char *argv[])
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{
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int sec;
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if (argc != 2 || convert_int(&sec, argv[1]) != 0)
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return -1;
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(void) sleep(sec);
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return 0;
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}
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void
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parse_cmd(char *s)
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{
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char *argv[5];
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int argc = 0;
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int r = -1;
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145
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for (;;) {
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while (*s != '\0' && !isgraph(*s))
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*s++ = '\0';
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if (*s == '\0')
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break;
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argv[argc++] = s;
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while (*s != '\0' && isgraph(*s))
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s++;
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}
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if (argv == 0)
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return;
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161
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if (strcmp(argv[0], "lock") == 0)
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r = locktest_cmd(argc, argv);
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else if (strcmp(argv[0], "test") == 0)
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r = locktest_cmd(argc, argv);
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else if (strcmp(argv[0], "sleep") == 0)
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r = sleep_cmd(argc, argv);
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168
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if (r != 0)
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printf("syntax error\n");
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}
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int
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main(int argc, char *argv[])
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175
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{
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char *line;
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177
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size_t len;
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178
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for (;;) {
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line = NULL;
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len = 0;
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printf("> ");
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fflush(stdout);
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if (getline(&line, &len, stdin) == -1)
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break;
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186
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parse_cmd(line);
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free(line);
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189
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}
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190
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return 0;
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192
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}
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