1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <fcntl.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 #include <sys/time.h>
24 #include <sys/resource.h>
25
main(int argc,char * argv[])26 int main(int argc, char *argv[])
27 {
28 int i;
29 int nfiles;
30 int *fds;
31 char *dir;
32 struct stat statbuf;
33 char name[16];
34 struct rlimit rlim;
35
36 if (argc != 3) {
37 fprintf(stderr, "Usage: opentest <directory> <num_files>\n");
38 exit(1);
39 }
40
41 dir = argv[1];
42
43 nfiles = atoi(argv[2]);
44 if ((nfiles <= 0) || (nfiles > 65536)) {
45 fprintf(stderr, "num_files must be between 1 and 65536\n");
46 exit(1);
47 }
48
49 if (stat(dir, &statbuf)) {
50 fprintf(stderr, "Cannot stat %s\n", dir);
51 exit(1);
52 }
53
54 if (! S_ISDIR(statbuf.st_mode)) {
55 fprintf(stderr, "%s is not a directory!\n", dir);
56 exit(1);
57 }
58
59 if (access(dir, R_OK | W_OK)) {
60 fprintf(stderr, "No access to %s\n", dir);
61 exit(1);
62 }
63
64 fds = malloc(nfiles * sizeof(int));
65 if (fds == 0) {
66 fprintf(stderr, "Unable to malloc array of %d fds\n", nfiles);
67 exit(1);
68 }
69
70 if (chdir(dir)) {
71 fprintf(stderr, "Cannot chdir to %s\n", dir);
72 exit(1);
73 }
74
75 rlim.rlim_cur = nfiles + 10;
76 rlim.rlim_max = nfiles + 10;
77 if (setrlimit(RLIMIT_NOFILE, &rlim)) {
78 fprintf(stderr, "Unable to raise RLIMIT_NOFILE to %ld\n", rlim.rlim_cur);
79 exit(1);
80 }
81
82 for (i = 0; i < nfiles; i++) {
83 snprintf(name, sizeof(name), "%d", i);
84 fds[i] = open(name, O_WRONLY | O_CREAT, 0666);
85 if (fds[i] < 0) {
86 fprintf(stderr, "Unable to open %d fd\n", i);
87 exit(1);
88 }
89 }
90
91 /* Rely upon exit to cleanup! */
92 exit(0);
93 }
94
95
96