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package sysinfo
import "base:intrinsics"
import "base:runtime"
import "core:strconv"
import "core:strings"
import "core:sys/linux"
@(private)
version_string_buf: [1024]u8
@(init, private)
init_os_version :: proc "contextless" () {
context = runtime.default_context()
os_version.platform = .Linux
b := strings.builder_from_bytes(version_string_buf[:])
// Try to parse `/etc/os-release` for `PRETTY_NAME="Ubuntu 20.04.3 LTS`
pretty_parse: {
fd, errno := linux.open("/etc/os-release", {})
if errno != .NONE {
strings.write_string(&b, "Unknown Linux Distro")
break pretty_parse
}
defer {
cerrno := linux.close(fd)
assert(cerrno == .NONE, "Failed to close the file descriptor")
}
os_release_buf: [2048]u8
n, read_errno := linux.read(fd, os_release_buf[:])
if read_errno != .NONE {
strings.write_string(&b, "Unknown Linux Distro")
break pretty_parse
}
release := string(os_release_buf[:n])
// Search the line in the file until we find "PRETTY_NAME="
NEEDLE :: "PRETTY_NAME=\""
_, _, post := strings.partition(release, NEEDLE)
if len(post) > 0 {
end := strings.index_any(post, "\"\n")
if end > -1 && post[end] == '"' {
strings.write_string(&b, post[:end])
}
}
if strings.builder_len(b) == 0 {
strings.write_string(&b, "Unknown Linux Distro")
}
}
// Grab kernel info using `uname()` syscall, https://linux.die.net/man/2/uname
uts: linux.UTS_Name
uname_errno := linux.uname(&uts)
assert(uname_errno == .NONE, "This should never happen!")
// Append the system name (typically "Linux") and kernel release (looks like 6.5.2-arch1-1)
strings.write_string(&b, ", ")
strings.write_string(&b, string(cstring(&uts.sysname[0])))
strings.write_rune(&b, ' ')
release_i := strings.builder_len(b)
strings.write_string(&b, string(cstring(&uts.release[0])))
release_str := string(b.buf[release_i:])
os_version.as_string = strings.to_string(b)
// Parse the Linux version out of the release string
version_loop: {
version_num, _, version_suffix := strings.partition(release_str, "-")
os_version.version = version_suffix
i: int
for part in strings.split_iterator(&version_num, ".") {
defer i += 1
dst: ^int
switch i {
case 0: dst = &os_version.major
case 1: dst = &os_version.minor
case 2: dst = &os_version.patch
case: break version_loop
}
num, ok := strconv.parse_int(part)
if !ok { break version_loop }
dst^ = num
}
}
}
@(init, private)
init_ram :: proc "contextless" () {
// Retrieve RAM info using `sysinfo`
sys_info: linux.Sys_Info
errno := linux.sysinfo(&sys_info)
assert_contextless(errno == .NONE, "Good luck to whoever's debugging this, something's seriously cucked up!")
ram = RAM{
total_ram = int(sys_info.totalram) * int(sys_info.mem_unit),
free_ram = int(sys_info.freeram) * int(sys_info.mem_unit),
total_swap = int(sys_info.totalswap) * int(sys_info.mem_unit),
free_swap = int(sys_info.freeswap) * int(sys_info.mem_unit),
}
}
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