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Write an output typemap for errno-based functions

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In Python, return status is signalled by exceptions (or lack thereof)
instead of int. Keep the typemap portable for any other languages we may
add in the future.

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
This commit is contained in:
Ryan Lee 2024-09-23 12:45:08 -07:00
parent 50d26beb00
commit a15768b0bf
1 changed files with 22 additions and 3 deletions
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25
libraries/libapparmor/swig/SWIG/libapparmor.i
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@ -123,15 +123,34 @@ extern char *aa_splitcon(char *con, char **mode);
/* apparmor.h */
extern int aa_is_enabled(void);
/* aa_find_mountpoint mnt is an output pointer to a heap-allocated string */
%cstring_output_allocate(char **mnt, free(*$1));
extern int aa_find_mountpoint(char **mnt);
/* These should not receive the VOID_Object typemap */
extern int aa_change_hat(const char *subprofile, unsigned long magic_token);
extern int aa_change_profile(const char *profile);
extern int aa_change_onexec(const char *profile);
extern int aa_change_hatv(const char *subprofiles[], unsigned long token);
extern int aa_stack_profile(const char *profile);
extern int aa_stack_onexec(const char *profile);
/* aa_find_mountpoint mnt is an output pointer to a heap-allocated string */
%cstring_output_allocate(char **mnt, free(*$1));
/* The other errno-based functions should not always be returning the int value:
* - Python exceptions signal success/failure status instead via the %exception
* handler above.
* - Perl (the other binding) has $! for accessing errno but would check the int
* return status first.
*
* The generated C code for (out) resets the return value to None
* before appending the returned data (argout generated by %cstring stuff)
*/
#ifdef SWIGPYTHON
%typemap(out,noblock=1) int {
#if defined(VOID_Object)
$result = VOID_Object;
#endif
}
#endif
extern int aa_find_mountpoint(char **mnt);
extern int aa_getprocattr(pid_t tid, const char *attr, char **label, char **mode);
extern int aa_gettaskcon(pid_t target, char **label, char **mode);
extern int aa_getcon(char **label, char **mode);