Where's the man page for the `sizeof` C function?
sizeof isn't a function. it's an operator: http://en.wikipedia.org/wiki/Sizeof
You can use man -wK 'sizeof' | sort -u
to find the articles that contain sizeof
, but that'll return a lot of results. However notice that every article about something will have that thing as a bareword surrounded by spaces, we'll search for the article like this zgrep -P '\ssizeof\s' /usr/share/man/man3/*
. But searching in section 3 doesn't give any useful information, so I'll search in section 7
$ zgrep -P '\ssizeof\s' /usr/share/man/man7/*
/usr/share/man/man7/inotify.7.gz: len = read(fd, buf, sizeof buf);
/usr/share/man/man7/operator.7.gz:! ~ ++ \-\- + \- (type) * & sizeof right to left
As you can see, the sizeof
is mentioned in the operator man page, because it's not a function but an operator and it works even without parentheses for identifiers like sizeof buf
above
OPERATOR(7) Linux Programmer's Manual OPERATOR(7)
NAME top
operator - C operator precedence and order of evaluation
DESCRIPTION top
This manual page lists C operators and their precedence in
evaluation.
Operator Associativity
() [] -> . left to right
! ~ ++ -- + - (type) * & sizeof right to left
* / % left to right
+ - left to right
<< >> left to right
< <= > >= left to right
== != left to right
& left to right
^ left to right
| left to right
&& left to right
|| left to right
?: right to left
= += -= *= /= %= <<= >>= &= ^= |= right to left
, left to right
http://man7.org/linux/man-pages/man7/operator.7.html