1185493Speter#include <sys/cdefs.h> 2185493Speter__FBSDID("$FreeBSD$"); 3185493Speter 4186512Srwatson#include <sys/param.h> 5185493Speter#include <sys/user.h> 6185493Speter#include <sys/sysctl.h> 7185493Speter#include <stdlib.h> 8185493Speter#include <string.h> 9185493Speter 10185493Speter#include "libutil.h" 11185493Speter 12185493Speterstruct kinfo_file * 13185493Speterkinfo_getfile(pid_t pid, int *cntp) 14185493Speter{ 15185493Speter int mib[4]; 16185493Speter int error; 17185493Speter int cnt; 18185493Speter size_t len; 19185493Speter char *buf, *bp, *eb; 20185493Speter struct kinfo_file *kif, *kp, *kf; 21185493Speter 22186314Smarcus *cntp = 0; 23185493Speter len = 0; 24185493Speter mib[0] = CTL_KERN; 25185493Speter mib[1] = KERN_PROC; 26185493Speter mib[2] = KERN_PROC_FILEDESC; 27185493Speter mib[3] = pid; 28185493Speter 29185493Speter error = sysctl(mib, 4, NULL, &len, NULL, 0); 30185493Speter if (error) 31186314Smarcus return (NULL); 32185493Speter len = len * 4 / 3; 33185493Speter buf = malloc(len); 34185493Speter if (buf == NULL) 35186314Smarcus return (NULL); 36185493Speter error = sysctl(mib, 4, buf, &len, NULL, 0); 37185493Speter if (error) { 38185493Speter free(buf); 39186314Smarcus return (NULL); 40185493Speter } 41185493Speter /* Pass 1: count items */ 42185493Speter cnt = 0; 43185493Speter bp = buf; 44185493Speter eb = buf + len; 45185493Speter while (bp < eb) { 46185553Speter kf = (struct kinfo_file *)(uintptr_t)bp; 47185493Speter bp += kf->kf_structsize; 48185493Speter cnt++; 49185493Speter } 50185493Speter 51185493Speter kif = calloc(cnt, sizeof(*kif)); 52185493Speter if (kif == NULL) { 53185493Speter free(buf); 54186314Smarcus return (NULL); 55185493Speter } 56185493Speter bp = buf; 57185493Speter eb = buf + len; 58185493Speter kp = kif; 59185493Speter /* Pass 2: unpack */ 60185493Speter while (bp < eb) { 61185553Speter kf = (struct kinfo_file *)(uintptr_t)bp; 62185493Speter /* Copy/expand into pre-zeroed buffer */ 63185493Speter memcpy(kp, kf, kf->kf_structsize); 64185493Speter /* Advance to next packed record */ 65185493Speter bp += kf->kf_structsize; 66185493Speter /* Set field size to fixed length, advance */ 67185493Speter kp->kf_structsize = sizeof(*kp); 68185493Speter kp++; 69185493Speter } 70185493Speter free(buf); 71185493Speter *cntp = cnt; 72185493Speter return (kif); /* Caller must free() return value */ 73185493Speter} 74