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man-page code doesn't compile with `-std=c99'
- From: Yubin Ruan <ablacktshirt at gmail dot com>
- To: linux-mm at vger dot kernel dot org
- Cc: gcc-help at gcc dot gnu dot org
- Date: Mon, 22 Aug 2016 20:12:04 +0800
- Subject: man-page code doesn't compile with `-std=c99'
- Authentication-results: sourceware.org; auth=none
Hi,
the code below is from linux man-page:
<http://man7.org/linux/man-pages/man2/stat.2.html>
however it doesn't compile against gcc's `-std=c99' flag.
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
struct stat sb;
if (argc != 2) {
fprintf(stderr, "Usage: %s <pathname>\n", argv[0]);
exit(EXIT_FAILURE);
}
if (stat(argv[1], &sb) == -1) {
perror("stat");
exit(EXIT_FAILURE);
}
printf("File type: ");
switch (sb.st_mode & S_IFMT) {
case S_IFBLK: printf("block device\n"); break;
case S_IFCHR: printf("character device\n"); break;
case S_IFDIR: printf("directory\n"); break;
case S_IFIFO: printf("FIFO/pipe\n"); break;
case S_IFLNK: printf("symlink\n"); break;
case S_IFREG: printf("regular file\n"); break;
case S_IFSOCK: printf("socket\n"); break;
default: printf("unknown?\n"); break;
}
printf("I-node number: %ld\n", (long) sb.st_ino);
printf("Mode: %lo (octal)\n",
(unsigned long) sb.st_mode);
printf("Link count: %ld\n", (long) sb.st_nlink);
printf("Ownership: UID=%ld GID=%ld\n",
(long) sb.st_uid, (long) sb.st_gid);
printf("Preferred I/O block size: %ld bytes\n",
(long) sb.st_blksize);
printf("File size: %lld bytes\n",
(long long) sb.st_size);
printf("Blocks allocated: %lld\n",
(long long) sb.st_blocks);
printf("Last status change: %s", ctime(&sb.st_ctime));
printf("Last file access: %s", ctime(&sb.st_atime));
printf("Last file modification: %s", ctime(&sb.st_mtime));
exit(EXIT_SUCCESS);
}
With `gcc -std=c99 test.c -o test' it throw error:
test.c: In function ‘main’:
test.c:24:26: error: ‘S_IFMT’ undeclared (first use in this function)
switch (sb.st_mode & S_IFMT) {
^
test.c:24:26: note: each undeclared identifier is reported only once for each function it appears in
test.c:25:10: error: ‘S_IFBLK’ undeclared (first use in this function)
case S_IFBLK: printf("block device\n"); break;
^
test.c:26:10: error: ‘S_IFCHR’ undeclared (first use in this function)
case S_IFCHR: printf("character device\n"); break;
^
test.c:27:10: error: ‘S_IFDIR’ undeclared (first use in this function)
case S_IFDIR: printf("directory\n"); break;
^
test.c:28:10: error: ‘S_IFIFO’ undeclared (first use in this function)
case S_IFIFO: printf("FIFO/pipe\n"); break;
^
test.c:29:10: error: ‘S_IFLNK’ undeclared (first use in this function)
case S_IFLNK: printf("symlink\n"); break;
^
test.c:30:10: error: ‘S_IFREG’ undeclared (first use in this function)
case S_IFREG: printf("regular file\n"); break;
^
test.c:31:10: error: ‘S_IFSOCK’ undeclared (first use in this function)
case S_IFSOCK: printf("socket\n"); break;
^
But without the "-std=c99" it work fine.
The man page doesn't mention standard issue about these S_IF* flags. Is it a man
page issue or a gcc issue ?
thanks,
ruan