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# go-sysconf
[](https://pkg.go.dev/github.com/tklauser/go-sysconf)
[](https://github.com/tklauser/go-sysconf/actions?query=workflow%3ATests)
`sysconf` for Go, without using cgo or external binaries (e.g. getconf).
Supported operating systems: Linux, macOS, DragonflyBSD, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos.
All POSIX.1 and POSIX.2 variables are supported, see [References](#references) for a complete list.
Additionally, the following non-standard variables are supported on some operating systems:
| Variable | Supported on |
|---|---|
| `SC_PHYS_PAGES` | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
| `SC_AVPHYS_PAGES` | Linux, OpenBSD, Solaris/Illumos |
| `SC_NPROCESSORS_CONF` | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
| `SC_NPROCESSORS_ONLN` | Linux, macOS, FreeBSD, NetBSD, OpenBSD, Solaris/Illumos |
| `SC_UIO_MAXIOV` | Linux |
## Usage
```Go
package main
import (
"fmt"
"github.com/tklauser/go-sysconf"
)
func main() {
// get clock ticks, this will return the same as C.sysconf(C._SC_CLK_TCK)
clktck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
if err == nil {
fmt.Printf("SC_CLK_TCK: %v\n", clktck)
}
}
```
## References
* [POSIX documenation for `sysconf`](http://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html)
* [Linux manpage for `sysconf(3)`](http://man7.org/linux/man-pages/man3/sysconf.3.html)
* [glibc constants for `sysconf` parameters](https://www.gnu.org/software/libc/manual/html_node/Constants-for-Sysconf.html)
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