[perl5.git] / mint / errno.h

/* Wrapper around broken system errno.h.  */

#ifndef _PERL_WRAPPER_AROUND_ERRNO_H
# define _PERL_WRAPPER_AROUND_ERRNO_H 1

/* First include the system file.  */
#include_next <errno.h> 

/* Now add the missing stuff.
#ifndef EAGAIN
# define EAGAIN EWOULDBLOCK
#endif

/* This one is problematic.  If you open() a directory with the
   MiNTLib you can't detect from errno if it is really a directory
   or if the file simply doesn't exist.  You'll get ENOENT 
   ("file not found") in either case.
   
   Defining EISDIR as ENOENT is actually a bad idea but works fine
   in general.  In praxi, if code checks for errno == EISDIR it
   will attempt an opendir() call on the file in question and this
   call will also file if the file really can't be found.  But
   you may get compile-time errors if the errno checking is embedded
   in a switch statement ("duplicate case value in switch").
   
   Anyway, here the define works alright.  */
#ifndef EISDIR
# define EISDIR ENOENT
#endif

#endif
Commit	Line	Data
61ae2fbf JH	1	/* Wrapper around broken system errno.h. */
	2
	3	#ifndef _PERL_WRAPPER_AROUND_ERRNO_H
	4	# define _PERL_WRAPPER_AROUND_ERRNO_H 1
	5
	6	/* First include the system file. */
	7	#include_next <errno.h>
	8
	9	/* Now add the missing stuff.
	10	#ifndef EAGAIN
	11	# define EAGAIN EWOULDBLOCK
	12	#endif
	13
	14	/* This one is problematic. If you open() a directory with the
	15	MiNTLib you can't detect from errno if it is really a directory
	16	or if the file simply doesn't exist. You'll get ENOENT
	17	("file not found") in either case.
	18
	19	Defining EISDIR as ENOENT is actually a bad idea but works fine
	20	in general. In praxi, if code checks for errno == EISDIR it
	21	will attempt an opendir() call on the file in question and this
	22	call will also file if the file really can't be found. But
	23	you may get compile-time errors if the errno checking is embedded
	24	in a switch statement ("duplicate case value in switch").
	25
	26	Anyway, here the define works alright. */
	27	#ifndef EISDIR
	28	# define EISDIR ENOENT
	29	#endif
	30
	31	#endif
	32