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Polyfill sysinfo() a ilttle bit on BSDs

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This commit is contained in:
Justine Tunney 2022-08-18 15:43:03 -07:00
parent 897e33ccc4
commit 75832f7379
6 changed files with 103 additions and 12 deletions
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65
libc/calls/sysinfo.c
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@ -16,36 +16,77 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/sysinfo.h"
#include "libc/calls/struct/sysinfo.internal.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timeval.h"
#include "libc/calls/struct/vmmeter-meta.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/macros.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
#define CTL_KERN 1
#define CTL_HW 6
#define KERN_BOOTTIME 21
#define HW_PHYSMEM 5
static int64_t GetUptime(void) {
if (IsNetbsd()) return 0; // TODO(jart): Why?
struct timeval x;
size_t n = sizeof(x);
int mib[] = {CTL_KERN, KERN_BOOTTIME};
if (sysctl(mib, ARRAYLEN(mib), &x, &n, 0, 0) == -1) return 0;
return _timespec_real().tv_sec - x.tv_sec;
}
static int64_t GetPhysmem(void) {
uint64_t x;
size_t n = sizeof(x);
int mib[] = {CTL_HW, HW_PHYSMEM};
if (sysctl(mib, ARRAYLEN(mib), &x, &n, 0, 0) == -1) return 0;
return x;
}
static int sys_sysinfo_bsd(struct sysinfo *info) {
info->uptime = GetUptime();
info->totalram = GetPhysmem();
return 0;
}
/**
* Returns amount of system ram, cores, etc.
*
* Only the `totalram` field is supported on all platforms right now.
* Support is best on Linux. Fields will be set to zero when they're not
* known.
*
* @return 0 on success or -1 w/ errno
* @error ENOSYS, EFAULT
* @error EFAULT
*/
int sysinfo(struct sysinfo *info) {
int rc;
if (IsAsan()) {
if (info && !__asan_is_valid(info, sizeof(*info))) {
return efault();
struct sysinfo x = {0};
if (IsAsan() && info && !__asan_is_valid(info, sizeof(*info))) {
rc = efault();
} else if (!IsWindows()) {
if (IsLinux()) {
rc = sys_sysinfo(&x);
} else {
rc = sys_sysinfo_bsd(&x);
}
}
bzero(info, sizeof(*info));
if (!IsWindows()) {
rc = sys_sysinfo(info);
} else {
rc = sys_sysinfo_nt(info);
rc = sys_sysinfo_nt(&x);
}
if (rc != -1) {
info->procs = MAX(1, info->procs);
info->mem_unit = MAX(1, info->mem_unit);
info->totalram = MAX((8 * 1024 * 1024) / info->mem_unit, info->totalram);
x.procs = MAX(1, x.procs);
x.mem_unit = MAX(1, x.mem_unit);
x.totalram = MAX((8 * 1024 * 1024) / x.mem_unit, x.totalram);
memcpy(info, &x, sizeof(x));
}
STRACE("sysinfo(%p) → %d% m", info, rc);
return rc;
}