Re: Cannot compile with _FILE_OFFSET_BITS = 64


"Scott.zhou" <rwxrxrx@xxxxxxxxx> wrote in message
news:fla6k1$j8h$1@xxxxxxxxxxxxxxxx
10 #define _FILE_OFFSET_BITS 64
11
12 int main(void) {
13 int fd;
14
15 if ((fd = open("file.hole", O_WRONLY | O_CREAT, 0664)) < 0) {
16 perror("open:");
17 exit(-1);
18 }
19
20 if (write(fd, "a", 1) != 1) {
21 perror("write:");
22 exit(-1);
23 }
24
25 if (lseek(fd, 4*1024*1024*1024, SEEK_SET) == -1) { // integer
overflow
No automatic conversion to 64 bit type is done by compiler. So make it
explicit by making one of the constants as 64 bit type. This makes entire
expression 64 bit.

=> 4*1024*1024*1024LL // 64 Bit constant made by LL suffix.


.

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