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util: mimic KCMP_FILE via KERN_FILE on DragonFly and FreeBSD

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Iterate over all file descriptors and compare their kernel addresses.

Reviewed-by: Emmanuel Vadot <manu@FreeBSD.org>
Reviewed-by: Val Packett <val@packett.cool>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6881>
This commit is contained in:
Jan Beich 2020-09-28 05:14:52 +00:00 • committed by Marge Bot
parent e12b68aab5
commit 2b76284635
1 changed files with 44 additions and 0 deletions
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44
src/util/os_file.c
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@ -206,6 +206,24 @@ os_read_file(const char *filename, size_t *size)
#endif
#if DETECT_OS_DRAGONFLY || DETECT_OS_FREEBSD
#include "macros.h" /* ARRAY_SIZE */
#include <sys/sysctl.h>
#if DETECT_OS_DRAGONFLY
#include <sys/kinfo.h>
typedef void *kvaddr_t;
#elif DETECT_OS_FREEBSD
#include <sys/file.h>
#define kinfo_file xfile
#define f_pid xf_pid
#define f_fd xf_fd
#define f_file xf_file
#endif
#endif /* DETECT_OS_DRAGONFLY || DETECT_OS_FREEBSD */
int
os_same_file_description(int fd1, int fd2)
{
@ -219,6 +237,32 @@ os_same_file_description(int fd1, int fd2)
#ifdef SYS_kcmp
return syscall(SYS_kcmp, pid, pid, KCMP_FILE, fd1, fd2);
#elif DETECT_OS_DRAGONFLY || DETECT_OS_FREEBSD
int mib[] = { CTL_KERN, KERN_FILE };
size_t len;
if (sysctl(mib, ARRAY_SIZE(mib), NULL, &len, NULL, 0))
return -1;
struct kinfo_file *kf = malloc(len);
if (sysctl(mib, ARRAY_SIZE(mib), kf, &len, NULL, 0))
return -1;
size_t count = len / sizeof(*kf);
pid_t pid = getpid();
kvaddr_t fd1_kfile = 0, fd2_kfile = 0;
for (size_t i = 0; i < count; i++) {
if (pid != kf[i].f_pid)
continue;
if (fd1 == kf[i].f_fd)
fd1_kfile = kf[i].f_file;
if (fd2 == kf[i].f_fd)
fd2_kfile = kf[i].f_file;
}
free(kf);
if (fd1_kfile == 0 || fd2_kfile == 0)
return -1;
return (fd1_kfile < fd2_kfile) | ((fd1_kfile > fd2_kfile) << 1);
#else
/* Otherwise we can't tell */
return -1;