115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
// #include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define MAX_PATH_LENGTH 100
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#define MAX_DIR_DEPTH 4
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int main(int argc, char const *argv[]) {
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if (mkdir("/SOME", 0777) == -1) {
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perror("Failed to create directory under /some");
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return 1;
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}
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// Create a directory under /SOME/RAMFS
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if (mkdir("/SOME/RAMFS", 0777) == -1) {
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perror("Failed to create directory under /SOME/RAMFS");
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return 1;
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}
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// Mount the first ramfs at /SOME/RAMFS
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if (mount("", "/SOME/RAMFS", "ramfs", 0, NULL) == -1) {
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perror("Failed to mount ramfs at /SOME/RAMFS");
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return 1;
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}
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if (mkdir("/SOME/RAMFS/some", 0777) == -1) {
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perror("Failed to create directory under /SOME/RAMFS/some");
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return 1;
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}
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puts("Success mkdir /SOME/RAMFS/some");
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// Create a directory under /SOME/RAMFS/some/another
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if (mkdir("/SOME/RAMFS/some/another", 0777) == -1) {
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perror("Failed to create directory under /SOME/RAMFS/some/another");
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return 1;
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}
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puts("Success mkdir /SOME/RAMFS/some/another");
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if (mount("", "/SOME/RAMFS/some/another", "ramfs", 0, NULL) == -1) {
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perror("Failed to mount ramfs at /SOME/RAMFS/some/another");
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return 1;
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}
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puts("Success mount on /SOME/RAMFS/some/another");
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if (mkdir("/SOME/RAMFS/some/another/just_another", 0777) == -1) {
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perror("Failed to create directory under /SOME/RAMFS/some/another");
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return 1;
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}
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puts("Success mkdir /SOME/RAMFS/some/another/just_another");
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if (mount("", "/SOME/RAMFS/some/another/just_another", "ramfs", 0, NULL) ==
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-1) {
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perror("Failed to mount ramfs at /SOME/RAMFS/some/another");
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return 1;
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}
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puts("Success mount on /SOME/RAMFS/some/another/just_another");
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// Write files under /SOME/RAMFS and /SOME/RAMFS/some/another
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FILE *file1 = fopen("/SOME/RAMFS/file1.txt", "w");
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if (file1 == NULL) {
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perror("Failed to open /SOME/RAMFS/file1.txt");
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return 1;
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}
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fprintf(file1, "This is file1.txt\n");
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fclose(file1);
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FILE *file2 = fopen("/SOME/RAMFS/some/another/file2.txt", "w");
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if (file2 == NULL) {
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perror("Failed to open /SOME/RAMFS/some/another/file2.txt");
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return 1;
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}
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fprintf(file2, "This is file2.txt\n");
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fclose(file2);
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FILE *file3 = fopen("/SOME/RAMFS/some/another/just_another/file3.txt", "w+");
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if (file3 == NULL) {
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perror("Failed to open /SOME/RAMFS/some/another/just_another/file3.txt");
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return 1;
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}
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fprintf(file3, "Multi mount behave well.\n");
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// print file3.txt
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char buffer[100];
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fseek(file3, 0, SEEK_SET);
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fread(buffer, 1, 100, file3);
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printf("file3.txt content: %s\n", buffer);
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fclose(file3);
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// test umount with flags ( use umount2 )
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if (umount("/SOME/RAMFS/some/another/just_another") == -1) {
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perror("Failed to umount ramfs at /SOME/RAMFS/some/another/just_another");
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return 1;
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}
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puts("Successful umount /SOME/RAMFS/some/another/just_another");
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// delete just_another
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if (rmdir("/SOME/RAMFS/some/another/just_another") == -1) {
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perror("Failed to delete /SOME/RAMFS/some/another/just_another");
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return 1;
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}
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return 0;
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} |