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helpers: implement getPPIDof on BSDs (#972) 

Get PPID from `struct kinfo_proc` via sysctl for the specified PID.
Adjusted for minor differences between each BSD kernel.
This commit is contained in:
Jan Beich 2022-11-07 20:26:23 +00:00 committed by GitHub
parent 1a55fb4170
commit 5d5066570c
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1 changed files with 45 additions and 0 deletions
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45
src/helpers/MiscFunctions.cpp
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@ -5,6 +5,31 @@
#include <sys/utsname.h>
#include <iomanip>
#if defined(__DragonFly__) || defined(__FreeBSD__) || \
defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
# include <sys/sysctl.h>
# if defined(__DragonFly__)
# include <sys/kinfo.h> // struct kinfo_proc
# elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
# include <sys/user.h> // struct kinfo_proc
# endif
# if defined(__NetBSD__)
# undef KERN_PROC
# define KERN_PROC KERN_PROC2
# define KINFO_PROC struct kinfo_proc2
# else
# define KINFO_PROC struct kinfo_proc
# endif
# if defined(__DragonFly__)
# define KP_PPID(kp) kp.kp_ppid
# elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
# define KP_PPID(kp) kp.ki_ppid
# else
# define KP_PPID(kp) kp.p_ppid
# endif
#endif
static const float transforms[][9] = {{
1.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
@ -369,6 +394,25 @@ void matrixProjection(float mat[9], int w, int h, wl_output_transform tr) {
}
int64_t getPPIDof(int64_t pid) {
#if defined(KERN_PROC_PID)
int mib[] = {
CTL_KERN,
KERN_PROC,
KERN_PROC_PID,
(int)pid,
# if defined(__NetBSD__) || defined(__OpenBSD__)
sizeof(KINFO_PROC),
1,
# endif
};
u_int miblen = sizeof(mib) / sizeof(mib[0]);
KINFO_PROC kp;
size_t sz = sizeof(KINFO_PROC);
if (sysctl(mib, miblen, &kp, &sz, NULL, 0) != -1)
return KP_PPID(kp);
return 0;
#else
std::string dir = "/proc/" + std::to_string(pid) + "/status";
FILE* infile;
@ -401,4 +445,5 @@ int64_t getPPIDof(int64_t pid) {
} catch (std::exception& e) {
return 0;
}
#endif
}