sys_unix.c File Reference

This handles abstract system level calls. More...

#include "config.h"
#include <sys/time.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "misc.h"
#include "sys_generic.h"
#include "debuglog.h"

Go to the source code of this file.

Macros
#define	_GNU_SOURCE   /* for secure_getenv(3) */

Functions
INTERNAL int	SYS_Sleep (int iTimeVal)
	Makes the current process sleep for some seconds.
INTERNAL int	SYS_USleep (int iTimeVal)
	Makes the current process sleep for some microseconds.
INTERNAL int	SYS_RandomInt (void)
	Generate a pseudo random number.
INTERNAL void	SYS_InitRandom (void)
	Initialize the random generator.
INTERNAL const char *	SYS_GetEnv (const char *name)
	(More) secure version of getenv(3)

Detailed Description

This handles abstract system level calls.

Definition in file sys_unix.c.

Macro Definition Documentation

_GNU_SOURCE

#define _GNU_SOURCE   /* for secure_getenv(3) */

Definition at line 41 of file sys_unix.c.

Function Documentation

SYS_GetEnv()

INTERNAL const char * SYS_GetEnv

(

const char *

name

)

(More) secure version of getenv(3)

Parameters

[in]

name

variable environment name

Returns

value of the environment variable called "name"

Definition at line 168 of file sys_unix.c.

SYS_InitRandom()

INTERNAL void SYS_InitRandom

(

void

)

Initialize the random generator.

Definition at line 140 of file sys_unix.c.

SYS_RandomInt()

INTERNAL int SYS_RandomInt

(

void

)

Generate a pseudo random number.

Returns

a non-negative random number

Remarks

the range is at least up to 2^31.

this is a CSPRNG when getrandom() is available, LCG otherwise.

Warning

SYS_InitRandom() should be called (once) before using this function.

not thread safe when system lacks getrandom() syscall.

not cryptographically secure when system lacks getrandom() syscall.

if interrupted by a signal, this function may return 0.

Definition at line 108 of file sys_unix.c.

SYS_Sleep()

INTERNAL int SYS_Sleep

(

int

iTimeVal

)

Makes the current process sleep for some seconds.

Parameters

[in]

iTimeVal

Number of seconds to sleep.

Definition at line 62 of file sys_unix.c.

SYS_USleep()

INTERNAL int SYS_USleep

(

int

iTimeVal

)

Makes the current process sleep for some microseconds.

Parameters

[in]

iTimeVal

Number of microseconds to sleep.

Definition at line 80 of file sys_unix.c.