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// Tests that opening the current directory, reading its entries
// rewinding and reading its entries again gives the same entries both times.
//
// https://github.com/mpartel/bindfs/issues/41
#ifdef __linux__
#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <unistd.h>
#define BUF_SIZE 4096
int main()
{
int fd = open(".", O_RDONLY | O_DIRECTORY);
if (fd == -1) {
perror("failed to open '.'");
return 1;
}
char buf1[BUF_SIZE];
char buf2[BUF_SIZE];
memset(buf1, 0, BUF_SIZE);
memset(buf2, 0, BUF_SIZE);
int amt_read1 = syscall(SYS_getdents, fd, buf1, BUF_SIZE);
if (amt_read1 <= 0) {
fprintf(stderr, "amt_read1=%d\n", amt_read1);
close(fd);
return 1;
}
off_t seek_res = lseek(fd, 0, SEEK_SET);
if (seek_res == (off_t)-1) {
perror("failed to lseek to 0");
close(fd);
return 1;
}
int amt_read2 = syscall(SYS_getdents, fd, buf2, BUF_SIZE);
if (amt_read2 <= 0) {
fprintf(stderr, "amt_read2=%d\n", amt_read2);
close(fd);
return 1;
}
if (amt_read1 != amt_read2) {
fprintf(stderr,
"First read gave %d bytes, second read gave %d bytes.\n",
amt_read1, amt_read2);
close(fd);
return 1;
}
if (memcmp(buf1, buf2, BUF_SIZE) != 0) {
fprintf(stderr, "First and second read results differ.\n");
close(fd);
return 1;
}
close(fd);
return 0;
}
#else // #ifdef __linux__
int main()
{
printf("This test (probably) only compiles on Linux.\n");
printf("Skipping by just returning successfully.\n");
return 0;
}
#endif // #ifdef __linux__
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