mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-13 10:02:38 +00:00
7adf46f0c6
- Use nitems(mib) instead of hardcoding mib's length - Sort sys/ #includes MFC after: 3 days
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/user.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "libutil.h"
|
|
|
|
struct kinfo_file *
|
|
kinfo_getfile(pid_t pid, int *cntp)
|
|
{
|
|
int mib[4];
|
|
int error;
|
|
int cnt;
|
|
size_t len;
|
|
char *buf, *bp, *eb;
|
|
struct kinfo_file *kif, *kp, *kf;
|
|
|
|
*cntp = 0;
|
|
len = 0;
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC;
|
|
mib[2] = KERN_PROC_FILEDESC;
|
|
mib[3] = pid;
|
|
|
|
error = sysctl(mib, nitems(mib), NULL, &len, NULL, 0);
|
|
if (error)
|
|
return (NULL);
|
|
len = len * 4 / 3;
|
|
buf = malloc(len);
|
|
if (buf == NULL)
|
|
return (NULL);
|
|
error = sysctl(mib, nitems(mib), buf, &len, NULL, 0);
|
|
if (error) {
|
|
free(buf);
|
|
return (NULL);
|
|
}
|
|
/* Pass 1: count items */
|
|
cnt = 0;
|
|
bp = buf;
|
|
eb = buf + len;
|
|
while (bp < eb) {
|
|
kf = (struct kinfo_file *)(uintptr_t)bp;
|
|
if (kf->kf_structsize == 0)
|
|
break;
|
|
bp += kf->kf_structsize;
|
|
cnt++;
|
|
}
|
|
|
|
kif = calloc(cnt, sizeof(*kif));
|
|
if (kif == NULL) {
|
|
free(buf);
|
|
return (NULL);
|
|
}
|
|
bp = buf;
|
|
eb = buf + len;
|
|
kp = kif;
|
|
/* Pass 2: unpack */
|
|
while (bp < eb) {
|
|
kf = (struct kinfo_file *)(uintptr_t)bp;
|
|
if (kf->kf_structsize == 0)
|
|
break;
|
|
/* Copy/expand into pre-zeroed buffer */
|
|
memcpy(kp, kf, kf->kf_structsize);
|
|
/* Advance to next packed record */
|
|
bp += kf->kf_structsize;
|
|
/* Set field size to fixed length, advance */
|
|
kp->kf_structsize = sizeof(*kp);
|
|
kp++;
|
|
}
|
|
free(buf);
|
|
*cntp = cnt;
|
|
return (kif); /* Caller must free() return value */
|
|
}
|