opentest.c revision dd03e47358368bbba26eed8d727d4703a1c8807a 
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
26int 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