README
¶
go-sysconf
sysconf for Go, without using cgo or external binaries (e.g. getconf).
Supported operating systems: Linux, Darwin, DragonflyBSD, FreeBSD, NetBSD, OpenBSD, Solaris.
All POSIX.1 and POSIX.2 variables are supported, see References for a complete list.
Additionally, the following non-standard variables are supported on some operating systems:
| Variable | Supported on |
|---|---|
SC_PHYS_PAGES |
Linux, Darwin, FreeBSD, NetBSD, OpenBSD, Solaris |
SC_AVPHYS_PAGES |
Linux, OpenBSD, Solaris |
SC_NPROCESSORS_CONF |
Linux, Darwin, FreeBSD, NetBSD, OpenBSD, Solaris |
SC_NPROCESSORS_ONLN |
Linux, Darwin, FreeBSD, NetBSD, OpenBSD, Solaris |
SC_UIO_MAXIOV |
Linux |
Usage
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
Documentation
¶
Overview ¶
Package sysconf implements the sysconf(3) function and provides the associated SC_* constants to query system configuration values.
Index ¶
Examples ¶
Constants ¶
View Source
const ( SC_AIO_LISTIO_MAX = 0x17 SC_AIO_MAX = 0x18 SC_AIO_PRIO_DELTA_MAX = 0x19 SC_ARG_MAX = 0x0 SC_ATEXIT_MAX = 0x57 SC_BC_BASE_MAX = 0x24 SC_BC_DIM_MAX = 0x25 SC_BC_SCALE_MAX = 0x26 SC_BC_STRING_MAX = 0x27 SC_CHILD_MAX = 0x1 SC_CLK_TCK = 0x2 SC_COLL_WEIGHTS_MAX = 0x28 SC_DELAYTIMER_MAX = 0x1a SC_EXPR_NEST_MAX = 0x2a SC_GETGR_R_SIZE_MAX = 0x45 SC_GETPW_R_SIZE_MAX = 0x46 SC_HOST_NAME_MAX = 0xb4 SC_IOV_MAX = 0x3c SC_LINE_MAX = 0x2b SC_LOGIN_NAME_MAX = 0x47 SC_MQ_OPEN_MAX = 0x1b SC_MQ_PRIO_MAX = 0x1c SC_NGROUPS_MAX = 0x3 SC_OPEN_MAX = 0x4 SC_PAGE_SIZE = 0x1e SC_PAGESIZE = 0x1e SC_THREAD_DESTRUCTOR_ITERATIONS = 0x49 SC_THREAD_KEYS_MAX = 0x4a SC_THREAD_STACK_MIN = 0x4b SC_THREAD_THREADS_MAX = 0x4c SC_RE_DUP_MAX = 0x2c SC_RTSIG_MAX = 0x1f SC_SEM_NSEMS_MAX = 0x20 SC_SEM_VALUE_MAX = 0x21 SC_SIGQUEUE_MAX = 0x22 SC_STREAM_MAX = 0x5 SC_SYMLOOP_MAX = 0xad SC_TIMER_MAX = 0x23 SC_TTY_NAME_MAX = 0x48 SC_TZNAME_MAX = 0x6 SC_ADVISORY_INFO = 0x84 SC_ASYNCHRONOUS_IO = 0xc SC_BARRIERS = 0x85 SC_CLOCK_SELECTION = 0x89 SC_CPUTIME = 0x8a SC_FSYNC = 0xf SC_IPV6 = 0xeb SC_JOB_CONTROL = 0x7 SC_MAPPED_FILES = 0x10 SC_MEMLOCK = 0x11 SC_MEMLOCK_RANGE = 0x12 SC_MEMORY_PROTECTION = 0x13 SC_MESSAGE_PASSING = 0x14 SC_MONOTONIC_CLOCK = 0x95 SC_PRIORITIZED_IO = 0xd SC_PRIORITY_SCHEDULING = 0xa SC_RAW_SOCKETS = 0xec SC_READER_WRITER_LOCKS = 0x99 SC_REALTIME_SIGNALS = 0x9 SC_REGEXP = 0x9b SC_SAVED_IDS = 0x8 SC_SEMAPHORES = 0x15 SC_SHARED_MEMORY_OBJECTS = 0x16 SC_SHELL = 0x9d SC_SPAWN = 0x9f SC_SPIN_LOCKS = 0x9a SC_SPORADIC_SERVER = 0xa0 SC_SS_REPL_MAX = 0xf1 SC_SYNCHRONIZED_IO = 0xe SC_THREAD_ATTR_STACKADDR = 0x4d SC_THREAD_ATTR_STACKSIZE = 0x4e SC_THREAD_CPUTIME = 0x8b SC_THREAD_PRIO_INHERIT = 0x50 SC_THREAD_PRIO_PROTECT = 0x51 SC_THREAD_PRIORITY_SCHEDULING = 0x4f SC_THREAD_PROCESS_SHARED = 0x52 SC_THREAD_ROBUST_PRIO_INHERIT = 0xf7 SC_THREAD_ROBUST_PRIO_PROTECT = 0xf8 SC_THREAD_SAFE_FUNCTIONS = 0x44 SC_THREAD_SPORADIC_SERVER = 0xa1 SC_THREADS = 0x43 SC_TIMEOUTS = 0xa4 SC_TIMERS = 0xb SC_TRACE = 0xb5 SC_TRACE_EVENT_FILTER = 0xb6 SC_TRACE_EVENT_NAME_MAX = 0xf2 SC_TRACE_INHERIT = 0xb7 SC_TRACE_LOG = 0xb8 SC_TRACE_NAME_MAX = 0xf3 SC_TRACE_SYS_MAX = 0xf4 SC_TRACE_USER_EVENT_MAX = 0xf5 SC_TYPED_MEMORY_OBJECTS = 0xa5 SC_VERSION = 0x1d SC_V7_ILP32_OFF32 = 0xed SC_V7_ILP32_OFFBIG = 0xee SC_V7_LP64_OFF64 = 0xef SC_V7_LPBIG_OFFBIG = 0xf0 SC_V6_ILP32_OFF32 = 0xb0 SC_V6_ILP32_OFFBIG = 0xb1 SC_V6_LP64_OFF64 = 0xb2 SC_V6_LPBIG_OFFBIG = 0xb3 SC_2_C_BIND = 0x2f SC_2_C_DEV = 0x30 SC_2_C_VERSION = 0x60 SC_2_CHAR_TERM = 0x5f SC_2_FORT_DEV = 0x31 SC_2_FORT_RUN = 0x32 SC_2_LOCALEDEF = 0x34 SC_2_PBS = 0xa8 SC_2_PBS_ACCOUNTING = 0xa9 SC_2_PBS_CHECKPOINT = 0xaf SC_2_PBS_LOCATE = 0xaa SC_2_PBS_MESSAGE = 0xab SC_2_PBS_TRACK = 0xac SC_2_SW_DEV = 0x33 SC_2_UPE = 0x61 SC_2_VERSION = 0x2e SC_XOPEN_CRYPT = 0x5c SC_XOPEN_ENH_I18N = 0x5d SC_XOPEN_REALTIME = 0x82 SC_XOPEN_REALTIME_THREADS = 0x83 SC_XOPEN_SHM = 0x5e SC_XOPEN_STREAMS = 0xf6 SC_XOPEN_UNIX = 0x5b SC_XOPEN_VERSION = 0x59 SC_XOPEN_XCU_VERSION = 0x5a SC_PHYS_PAGES = 0x55 SC_AVPHYS_PAGES = 0x56 SC_NPROCESSORS_CONF = 0x53 SC_NPROCESSORS_ONLN = 0x54 SC_UIO_MAXIOV = 0x3c )
Variables ¶
This section is empty.
Functions ¶
func Sysconf ¶
Sysconf returns the value of a sysconf(3) runtime system parameter. The name parameter should be a SC_* constant define in this package. The implementation is GOOS-specific and certain SC_* constants might not be defined for all GOOSes.
Example (Clktck) ¶
clktck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
if err != nil {
fmt.Fprintf(os.Stderr, "Sysconf: %v\n", err)
}
fmt.Printf("sysconf(SC_CLK_TCK) = %v\n", clktck)
Output:
Example (InvalidParameter) ¶
_, err := sysconf.Sysconf(-1) fmt.Print(err)
Output: invalid parameter value
Types ¶
This section is empty.
Source Files
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Directories
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