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__builtin_types_compatible_p(3) [netbsd man page]

__BUILTIN_TYPES_COMPATIBLE_P(3) 			   BSD Library Functions Manual 			   __BUILTIN_TYPES_COMPATIBLE_P(3)

NAME
__builtin_types_compatible_p -- GNU extension to check equivalent types SYNOPSIS
int __builtin_types_compatible_p(type_a, type_b); DESCRIPTION
The __builtin_types_compatible_p() is a GNU extension for determining whether two types are equivalent. If type_a is equivalent to type_b, a value 1 is returned. Otherwise __builtin_types_compatible_p() returns 0. The following remarks should be taken into account. 1. The architecture-specific size of the two types does not have an impact on the result. For example, sizeof(char *) and sizeof(int) result the same value on i386, but the types naturally are not equivalent. 2. Type qualifiers are ignored. The function returns the same value for long and const long. 3. The amount of pointer indirection affects the result. For example, double * is not equivalent to double **. 4. Two types defined with typedef are equivalent if and only if their underlying types are equivalent. 5. The enum type is a special case in that two enum types are not considered equivalent. EXAMPLES
The following example combines __builtin_types_compatible_p() and the typeof(3) construct: #define __COMPARE_TYPES(v, t) __builtin_types_compatible_p(__typeof__(v), t) ... if (__COMPARE_TYPES(p, double) != 0) err(EX_DATAERR, "invalid type"); SEE ALSO
gcc(1), __builtin_constant_p(3), typeof(3) CAVEATS
This is a non-standard, compiler-specific extension. BSD
December 21, 2010 BSD

Check Out this Related Man Page

ACL_EQUIV_MODE(3)					   BSD Library Functions Manual 					 ACL_EQUIV_MODE(3)

NAME
acl_equiv_mode -- check for an equivalent ACL LIBRARY
Linux Access Control Lists library (libacl, -lacl). SYNOPSIS
#include <sys/types.h> #include <acl/libacl.h> int acl_equiv_mode(acl_t acl, mode_t *mode_p); DESCRIPTION
The acl_equiv_mode() function checks if the ACL pointed to by the argument acl contains only the required ACL entries of tag types ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER, and contains no permissions other that ACL_READ, ACL_WRITE or ACL_EXECUTE. If the ACL has this form, it can can be fully represented with the traditional file permission bits, and is considered equivalent with the traditional file per- mission bits. If acl is an equivalent ACL and the pointer mode_p is not NULL, the value pointed to by mode_p is set to the value that defines the same owner, group and other permissions as contained in the ACL. RETURN VALUE
On success, this function returns the value 0 if acl is an equivalent ACL, and the value 1 if acl is not an equivalent ACL. On error, the value -1 is returned, and errno is set appropriately. ERRORS
If any of the following conditions occur, the acl_equiv_mode() function returns the value -1 and sets errno to the corresponding value: [EINVAL] The argument acl is not a valid pointer to an ACL. STANDARDS
This is a non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std 1003.1e draft 17 ("POSIX.1e", aban- doned). SEE ALSO
acl_from_mode(3), acl(5) AUTHOR
Written by Andreas Gruenbacher <a.gruenbacher@bestbits.at>. Linux ACL March 23, 2002 Linux ACL
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