03-12-2013
Hidden strcmp in glibc
In glibc in file strcmp I see a definition of strcmp function and below it there is a macro "libc_hidden_builtin_def (strcmp)".
This macro "libc_hidden_builtin_def (strcmp)" looks to be defining some platform(x32-64, i386) specific implementation of strcmp.
Question is when is this libc_hidden_builtin_def (strcmp) gets enabled, called and used?
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LEARN ABOUT OPENDARWIN
strcmp
STRCMP(3) Linux Programmer's Manual STRCMP(3)
NAME
strcmp, strncmp - compare two strings
SYNOPSIS
#include <string.h>
int strcmp(const char *s1, const char *s2);
int strncmp(const char *s1, const char *s2, size_t n);
DESCRIPTION
The strcmp() function compares the two strings s1 and s2. It returns an integer less than, equal to, or greater than zero if s1 is found,
respectively, to be less than, to match, or be greater than s2.
The strncmp() function is similar, except it compares only the first (at most) n bytes of s1 and s2.
RETURN VALUE
The strcmp() and strncmp() functions return an integer less than, equal to, or greater than zero if s1 (or the first n bytes thereof) is
found, respectively, to be less than, to match, or be greater than s2.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+--------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------+---------------+---------+
|strcmp(), strncmp() | Thread safety | MT-Safe |
+--------------------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
SEE ALSO
bcmp(3), memcmp(3), strcasecmp(3), strcoll(3), string(3), strncasecmp(3), strverscmp(3), wcscmp(3), wcsncmp(3)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2015-08-08 STRCMP(3)