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Write custom SWIG typemap for pid_t

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Surprisingly, SWIG did not pick up the "typedef int pid_t" from the C headers.
As such, we need to provide our own wrapper. We don't just replicate the typdef
because we still support systems that have 16-bit PIDs.

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
This commit is contained in:
Ryan Lee 2024-10-03 17:22:40 -07:00
parent 2ce217b873
commit d199c2ae33
1 changed files with 22 additions and 0 deletions
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22
libraries/libapparmor/swig/SWIG/libapparmor.i
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@ -276,6 +276,28 @@ extern int aa_stack_onexec(const char *profile);
}
#endif
/*
* We can't use "typedef int pid_t" because we still support systems
* with 16-bit PIDs and SWIG can't find sys/types.h
*
* Capture the passed-in value as an intmax_t because pid_t is guaranteed
* to be a signed integer
*/
%typemap(in,noblock=1,fragment="SWIG_AsVal_long") pid_t (int conv_pid, intmax_t pid_large) {
conv_pid = SWIG_AsVal_long($input, &pid_large);
if (!SWIG_IsOK(conv_pid)) {
%argument_fail(conv_pid, "pid_t", $symname, $argnum);
}
/*
* Cast the long to a pid_t and then cast back to check for overflow
* Technically this is implementation-defined behaviour but we should be fine
*/
$1 = (pid_t) pid_large;
if ((intmax_t) $1 != pid_large) {
SWIG_exception_fail(SWIG_OverflowError, "pid_t is too large");
}
}
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);