ls.c:(.text+0x2dc): undefined reference to `S_ISSOCK'

Kirkina A. OP (Company: no) #5066028
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if(S_ISDIR(statbuf.st_mode))

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             printf("d");

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        else if(S_ISCHR(statbuf.st_mode))

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            printf("c");

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        else if(S_ISBLK(statbuf.st_mode))

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            printf("b");

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        else if(S_ISREG(statbuf.st_mode))

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            printf("-");

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        else if(S_ISFIFO(statbuf.st_mode))

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            printf("f");

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        else if(S_ISLNK(statbuf.st_mode))

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            printf("l");

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        else if(S_ISSOCK(statbuf.st_mode))

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            printf("s");

I read the manual here 
https://www.gnu.org/software/libc/manual/html_node/Testing-File-Type.html
This code after compilation produces this error, if I comment on the 
line with this error, then the error disappears
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Rolf Magnus Guest #5069675
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Kirkina A. wrote:
>> Compile with
>>
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>> -D_XOPEN_SOURCE=500

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>>

>>
>> man 2 stat
>>
>> should have shown you that.
>
> man 2 stat did not show it.

Seems this has been moved to a separate man page lately. On my linux 
system, this is mentioned in man 2 stat, but the latest version of the 
linux man page project 
(http://man7.org/linux/man-pages/man2/stat.2.html) just says:

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st_mode

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              This field contains the file type and mode.  See inode(7) for

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              further information.


and the inode man page says:

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The definitions of most of the above file type test macros are

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provided if any of the following feature test macros is defined:

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_BSD_SOURCE (in glibc 2.19 and earlier), _SVID_SOURCE (in glibc 2.19

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and earlier), or _DEFAULT_SOURCE (in glibc 2.20 and later).  In

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addition, definitions of all of the above macros except S_IFSOCK and

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S_ISSOCK() are provided if _XOPEN_SOURCE is defined.  The definition

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of S_IFSOCK can also be exposed by defining _XOPEN_SOURCE with a

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value of 500 or greater.
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