Hello,
Using O_DIRECT flag, read() failed and errno is EINVAL. kernel 2.4.22 Filesystem Ext3 mount on /home What's wrong ? Thanks
Yves Crespin
#gcc -Wall -D_GNU_SOURCE direct.c -o direct #cp direct d #./direct d #open failed [d] 040402 0666 errno 22 #
/* --- start code --- */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h>
#define O_BINARY 0
int main(int argc,char *argv[])
{
struct stat sbuf;
char buf[8192];
int openFlags;
int fd;
int nb;
int size;if (argc!=2){
printf("Missing file name\n");
exit(2);
}
openFlags = O_RDWR|O_BINARY|O_NOCTTY;
openFlags |= O_DIRECT; /* Not POSIX */
fd = open(argv[1],openFlags,0666);
if (fd==-1){
printf("open failed [%s] %#o %#o errno %d\n",argv[1],openFlags,0666,errno);
exit(1);
}
if (fstat(fd,&sbuf)<0){
printf("fstat failed\n");
exit(1);
}
size = sbuf.st_blksize;
if (size > sizeof(buf)){
printf("Page size too big\n");
exit(3);
}
if (size > sbuf.st_size){
printf("File too small\n");
exit(3);
}
nb = read(fd,buf,size);
if (nb != size){
printf("read failed fd %d size %d nb %d errno %d\n",fd,size,nb,errno);
exit(1);
}
if (close(fd)){
printf("close failed\n");
exit(1);
}
return 0;
}
/* --- end code --- */
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