1 #include <sys/cdefs.h> 2 __FBSDID("$FreeBSD$"); 3 4 #include <sys/param.h> 5 #include <sys/user.h> 6 #include <sys/sysctl.h> 7 #include <stdlib.h> 8 #include <string.h> 9 10 #include "libutil.h" 11 12 struct kinfo_vmentry * 13 kinfo_getvmmap(pid_t pid, int *cntp) 14 { 15 int mib[4]; 16 int error; 17 int cnt; 18 size_t len; 19 char *buf, *bp, *eb; 20 struct kinfo_vmentry *kiv, *kp, *kv; 21 22 *cntp = 0; 23 len = 0; 24 mib[0] = CTL_KERN; 25 mib[1] = KERN_PROC; 26 mib[2] = KERN_PROC_VMMAP; 27 mib[3] = pid; 28 29 error = sysctl(mib, 4, NULL, &len, NULL, 0); 30 if (error) 31 return (NULL); 32 len = len * 4 / 3; 33 buf = malloc(len); 34 if (buf == NULL) 35 return (NULL); 36 error = sysctl(mib, 4, buf, &len, NULL, 0); 37 if (error) { 38 free(buf); 39 return (NULL); 40 } 41 /* Pass 1: count items */ 42 cnt = 0; 43 bp = buf; 44 eb = buf + len; 45 while (bp < eb) { 46 kv = (struct kinfo_vmentry *)(uintptr_t)bp; 47 bp += kv->kve_structsize; 48 cnt++; 49 } 50 51 kiv = calloc(cnt, sizeof(*kiv)); 52 if (kiv == NULL) { 53 free(buf); 54 return (NULL); 55 } 56 bp = buf; 57 eb = buf + len; 58 kp = kiv; 59 /* Pass 2: unpack */ 60 while (bp < eb) { 61 kv = (struct kinfo_vmentry *)(uintptr_t)bp; 62 /* Copy/expand into pre-zeroed buffer */ 63 memcpy(kp, kv, kv->kve_structsize); 64 /* Advance to next packed record */ 65 bp += kv->kve_structsize; 66 /* Set field size to fixed length, advance */ 67 kp->kve_structsize = sizeof(*kp); 68 kp++; 69 } 70 free(buf); 71 *cntp = cnt; 72 return (kiv); /* Caller must free() return value */ 73 } 74