├── .gitignore
├── getlogin
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── getlogin
    │               └── Getlogin.java
├── getpid
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── getpid
    │               └── Getpid.java
├── gettimeofday
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── gettimeofday
    │               └── Gettimeofday.java
├── pom.xml
├── qsort
    ├── pom.xml
    └── src
    │   └── main
    │       └── java
    │           └── qsort
    │               └── Qsort.java
└── uname
    ├── pom.xml
    └── src
        └── main
            └── java
                └── uname
                    └── GetUname.java


/.gitignore:
--------------------------------------------------------------------------------
1 | *.orig$
2 | *.rej$
3 | *.class$
4 | *~
5 | .idea
6 | *.iml
7 | target
8 | 


--------------------------------------------------------------------------------
/getlogin/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |   <parent>
 4 |     <artifactId>jnr-ffi-example</artifactId>
 5 |     <groupId>jnr.ffi.example</groupId>
 6 |     <version>1.0</version>
 7 |   </parent>
 8 |   <modelVersion>4.0.0</modelVersion>
 9 | 
10 |   <groupId>getlogin</groupId>
11 |   <artifactId>getlogin</artifactId>
12 |   <packaging>jar</packaging>
13 | 
14 |   <name>getlogin</name>
15 |   <url>http://maven.apache.org</url>
16 | 
17 |   <properties>
18 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
19 |   </properties>
20 |   <build>
21 |     <plugins>
22 |       <plugin>
23 |         <artifactId>maven-assembly-plugin</artifactId>
24 |         <configuration>
25 |           <descriptorRefs>
26 |             <descriptorRef>jar-with-dependencies</descriptorRef>
27 |           </descriptorRefs>
28 |           <archive>
29 |             <manifest>
30 |               <mainClass>getlogin.Getlogin</mainClass>
31 |             </manifest>
32 |           </archive>
33 |         </configuration>
34 |         <executions>
35 |           <execution>
36 |             <id>simple-command</id>
37 |             <phase>package</phase>
38 |             <goals>
39 |               <goal>attached</goal>
40 |             </goals>
41 |           </execution>
42 |         </executions>
43 |       </plugin>
44 |     </plugins>
45 |   </build>
46 | </project>
47 | 


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/getlogin/src/main/java/getlogin/Getlogin.java:
--------------------------------------------------------------------------------
 1 | package getlogin;
 2 | 
 3 | import jnr.ffi.LibraryLoader;
 4 | 
 5 | /**
 6 |  * Gets the login name of the current user
 7 |  */
 8 | public class Getlogin {
 9 |     public interface LibC  {
10 |         public String getlogin();
11 |     }
12 | 
13 |     public static void main( String[] args ) {
14 |         LibC libc = LibraryLoader.create(LibC.class).load("c");
15 | 
16 |         System.out.println("login=" + libc.getlogin());
17 |     }
18 | }
19 | 


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/getpid/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |   <parent>
 4 |     <artifactId>jnr-ffi-example</artifactId>
 5 |     <groupId>jnr.ffi.example</groupId>
 6 |     <version>1.0</version>
 7 |   </parent>
 8 |   <modelVersion>4.0.0</modelVersion>
 9 | 
10 |   <artifactId>getpid</artifactId>
11 |   <packaging>jar</packaging>
12 | 
13 |   <name>getpid</name>
14 |   <url>http://maven.apache.org</url>
15 | 
16 |   <properties>
17 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
18 |   </properties>
19 | 
20 |   <build>
21 |     <plugins>
22 |       <plugin>
23 |         <groupId>org.codehaus.mojo</groupId>
24 |         <artifactId>appassembler-maven-plugin</artifactId>
25 |         <version>1.1.1</version>
26 |         <configuration>
27 |           <!-- set alternative assemble directory -->
28 |           <assembleDirectory>${project.build.directory}</assembleDirectory>
29 |           <programs>
30 |             <program>
31 |               <mainClass>getpid.Getpid</mainClass>
32 |               <name>getpid</name>
33 |             </program>
34 |           </programs>
35 |         </configuration>
36 |         <!-- append appassembler:assemble to the package phase -->
37 |         <executions>
38 |           <execution>
39 |             <phase>package</phase>
40 |             <goals>
41 |               <goal>assemble</goal>
42 |             </goals>
43 |           </execution>
44 |         </executions>
45 |       </plugin>
46 |       <plugin>
47 |         <artifactId>maven-assembly-plugin</artifactId>
48 |         <configuration>
49 |           <descriptorRefs>
50 |             <descriptorRef>jar-with-dependencies</descriptorRef>
51 |           </descriptorRefs>
52 |           <archive>
53 |             <manifest>
54 |               <mainClass>getpid.Getpid</mainClass>
55 |             </manifest>
56 |           </archive>
57 |         </configuration>
58 |         <executions>
59 |           <execution>
60 |             <id>simple-command</id>
61 |             <phase>package</phase>
62 |             <goals>
63 |               <goal>attached</goal>
64 |             </goals>
65 |           </execution>
66 |         </executions>
67 |       </plugin>
68 |     </plugins>
69 |   </build>
70 | </project>
71 | 


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/getpid/src/main/java/getpid/Getpid.java:
--------------------------------------------------------------------------------
 1 | package getpid;
 2 | 
 3 | import jnr.ffi.*;
 4 | import jnr.ffi.types.pid_t;
 5 | 
 6 | /**
 7 |  * Gets the process ID of the current process, and that of its parent.
 8 |  */
 9 | public class Getpid {
10 |     public interface LibC  {
11 |         public @pid_t long getpid();
12 |         public @pid_t long getppid();
13 |     }
14 | 
15 |     public static void main(String[] args) {
16 |         LibC libc = LibraryLoader.create(LibC.class).load("c");
17 | 
18 |         System.out.println("pid=" + libc.getpid() + " parent pid=" + libc.getppid());
19 |     }
20 | }
21 | 


--------------------------------------------------------------------------------
/gettimeofday/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |   <parent>
 4 |     <artifactId>jnr-ffi-example</artifactId>
 5 |     <groupId>jnr.ffi.example</groupId>
 6 |     <version>1.0</version>
 7 |   </parent>
 8 |   <modelVersion>4.0.0</modelVersion>
 9 | 
10 |   <artifactId>gettimeofday</artifactId>
11 |   <packaging>jar</packaging>
12 | 
13 |   <name>gettimeofday</name>
14 |   <url>http://maven.apache.org</url>
15 | 
16 |   <properties>
17 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
18 |   </properties>
19 | 
20 |   <build>
21 |     <plugins>
22 |       <plugin>
23 |         <artifactId>maven-assembly-plugin</artifactId>
24 |         <configuration>
25 |           <descriptorRefs>
26 |             <descriptorRef>jar-with-dependencies</descriptorRef>
27 |           </descriptorRefs>
28 |           <archive>
29 |             <manifest>
30 |               <mainClass>gettimeofday.Gettimeofday</mainClass>
31 |             </manifest>
32 |           </archive>
33 |         </configuration>
34 |         <executions>
35 |           <execution>
36 |             <id>simple-command</id>
37 |             <phase>package</phase>
38 |             <goals>
39 |               <goal>attached</goal>
40 |             </goals>
41 |           </execution>
42 |         </executions>
43 |       </plugin>
44 |     </plugins>
45 |   </build>
46 | </project>
47 | 


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/gettimeofday/src/main/java/gettimeofday/Gettimeofday.java:
--------------------------------------------------------------------------------
 1 | package gettimeofday;
 2 | 
 3 | import jnr.ffi.*;
 4 | import jnr.ffi.Runtime;
 5 | import jnr.ffi.annotations.Out;
 6 | import jnr.ffi.annotations.Transient;
 7 | 
 8 | /**
 9 |  * Retrieves the current system time using gettimeofday(3)
10 |  */
11 | public class Gettimeofday {
12 |     public static final class Timeval extends Struct {
13 |         public final time_t tv_sec = new time_t();
14 |         public final Unsigned32 tv_usec = new Unsigned32();
15 | 
16 |         public Timeval(Runtime runtime) {
17 |             super(runtime);
18 |         }
19 |     }
20 | 
21 |     public interface LibC  {
22 |         public int gettimeofday(@Out @Transient Timeval tv, Pointer unused);
23 |     }
24 | 
25 |     public static void main( String[] args ) {
26 |         LibC libc = LibraryLoader.create(LibC.class).load("c");
27 |         Runtime runtime = Runtime.getRuntime(libc);
28 | 
29 |         Timeval tv = new Timeval(runtime);
30 |         libc.gettimeofday(tv, null);
31 |         System.out.println("gettimeofday tv.tv_sec=" + tv.tv_sec.get() + " tv.tv_usec=" + tv.tv_usec.get());
32 |     }
33 | }
34 | 


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project xmlns="http://maven.apache.org/POM/4.0.0"
 3 |          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5 |     <modelVersion>4.0.0</modelVersion>
 6 | 
 7 |     <groupId>jnr.ffi.example</groupId>
 8 |     <artifactId>jnr-ffi-example</artifactId>
 9 |   <packaging>pom</packaging>
10 |   <version>1.0</version>
11 |   <modules>
12 |     <module>qsort</module>
13 |     <module>gettimeofday</module>
14 |     <module>getpid</module>
15 |     <module>getlogin</module>
16 |     <module>uname</module>
17 |   </modules>
18 |   <dependencies>
19 |       <dependency>
20 |         <groupId>junit</groupId>
21 |         <artifactId>junit</artifactId>
22 |         <version>4.8.2</version>
23 |       </dependency>
24 |     <dependency>
25 |         <groupId>com.github.jnr</groupId>
26 |         <artifactId>jnr-ffi</artifactId>
27 |         <version>2.0.9</version>
28 |     </dependency>
29 |   </dependencies>
30 | 
31 | </project>
32 | 


--------------------------------------------------------------------------------
/qsort/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |   <parent>
 4 |     <artifactId>jnr-ffi-example</artifactId>
 5 |     <groupId>jnr.ffi.example</groupId>
 6 |     <version>1.0</version>
 7 |   </parent>
 8 |   <modelVersion>4.0.0</modelVersion>
 9 | 
10 |   <artifactId>qsort</artifactId>
11 |   <packaging>jar</packaging>
12 | 
13 |   <name>qsort</name>
14 |   <url>http://maven.apache.org</url>
15 |   <build>
16 |     <plugins>
17 |       <plugin>
18 |         <artifactId>maven-assembly-plugin</artifactId>
19 |         <configuration>
20 |           <descriptorRefs>
21 |             <descriptorRef>jar-with-dependencies</descriptorRef>
22 |           </descriptorRefs>
23 |           <archive>
24 |             <manifest>
25 |               <mainClass>qsort.Qsort</mainClass>
26 |             </manifest>
27 |           </archive>
28 |         </configuration>
29 |         <executions>
30 |           <execution>
31 |             <id>simple-command</id>
32 |             <phase>package</phase>
33 |             <goals>
34 |               <goal>attached</goal>
35 |             </goals>
36 |           </execution>
37 |         </executions>
38 |       </plugin>
39 |     </plugins>
40 |   </build>
41 | 
42 |   <properties>
43 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
44 |   </properties>
45 | 
46 | </project>
47 | 


--------------------------------------------------------------------------------
/qsort/src/main/java/qsort/Qsort.java:
--------------------------------------------------------------------------------
 1 | package qsort;
 2 | 
 3 | 
 4 | import jnr.ffi.LibraryLoader;
 5 | import jnr.ffi.Memory;
 6 | import jnr.ffi.Pointer;
 7 | import jnr.ffi.Runtime;
 8 | import jnr.ffi.annotations.Delegate;
 9 | import jnr.ffi.types.size_t;
10 | 
11 | import java.nio.Buffer;
12 | import java.nio.ByteBuffer;
13 | import java.nio.ByteOrder;
14 | import java.nio.IntBuffer;
15 | 
16 | /**
17 |  * Hello world!
18 |  *
19 |  */
20 | public class Qsort {
21 | 
22 |     public static interface Compare {
23 |         @Delegate public int compare(Pointer p1, Pointer p2);
24 |     }
25 | 
26 |     public static final class IntCompare implements Compare {
27 |         public int compare(Pointer p1, Pointer p2) {
28 |             int i1 = p1.getInt(0);
29 |             int i2 = p2.getInt(0);
30 | 
31 |             return i1 < i2 ? -1 : i1 > i2 ? 1 : 0;
32 |         }
33 |     }
34 | 
35 |     public interface LibC {
36 |         public int qsort(int[] data, @size_t int count, @size_t int width, Compare compare);
37 |         public int qsort(Pointer data, @size_t long count, @size_t int width, Compare compare);
38 |         public int qsort(Buffer data, @size_t long count, @size_t int width, Compare compare);
39 |     }
40 | 
41 |     public static void main(String[] args) {
42 | 
43 |         LibC libc = LibraryLoader.create(LibC.class).load("c");
44 | 
45 |         int[] numbers = { 2, 1 };
46 |         System.out.println("qsort using java int[] array");
47 |         System.out.println("before, numbers[0]=" + numbers[0] + " numbers[1]=" + numbers[1]);
48 |         libc.qsort(numbers, 2, 4, new IntCompare());
49 |         System.out.println("after, numbers[0]=" + numbers[0] + " numbers[1]=" + numbers[1]);
50 |         System.out.append('\n');
51 | 
52 |         System.out.println("sort using native memory");
53 |         Pointer memory = Memory.allocate(Runtime.getRuntime(libc), 8);
54 |         memory.putInt(0, 4);
55 |         memory.putInt(4, 3); // offset is in bytes
56 |         System.out.println("before, memory[0]=" + memory.getInt(0) + " memory[1]=" + memory.getInt(4));
57 |         libc.qsort(memory, 2, 4, new IntCompare());
58 |         System.out.println("after, memory[0]=" + memory.getInt(0) + " memory[1]=" + memory.getInt(4));
59 | 
60 |         System.out.append('\n');
61 |         System.out.println("qsort using NIO buffer");
62 |         IntBuffer intBuffer = ByteBuffer.allocateDirect(8).order(ByteOrder.nativeOrder()).asIntBuffer();
63 |         intBuffer.put(0, 6);
64 |         intBuffer.put(1, 5); // offset is in units of int elements
65 | 
66 |         System.out.println("before, buffer[0]=" + intBuffer.get(0) + " buffer[1]=" + intBuffer.get(1));
67 |         libc.qsort(intBuffer, 2, 4, new IntCompare());
68 |         System.out.println("after, buffer[0]=" + intBuffer.get(0) + " buffer[1]=" + intBuffer.get(1));
69 | 
70 |     }
71 | }
72 | 


--------------------------------------------------------------------------------
/uname/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |   <parent>
 4 |     <artifactId>jnr-ffi-example</artifactId>
 5 |     <groupId>jnr.ffi.example</groupId>
 6 |     <version>1.0</version>
 7 |   </parent>
 8 |   <modelVersion>4.0.0</modelVersion>
 9 | 
10 |   <groupId>uname</groupId>
11 |   <artifactId>uname</artifactId>
12 |   <packaging>jar</packaging>
13 | 
14 |   <name>uname</name>
15 |   <url>http://maven.apache.org</url>
16 | 
17 |   <properties>
18 |     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
19 |   </properties>
20 |   <build>
21 |     <plugins>
22 |       <plugin>
23 |         <artifactId>maven-assembly-plugin</artifactId>
24 |         <configuration>
25 |           <descriptorRefs>
26 |             <descriptorRef>jar-with-dependencies</descriptorRef>
27 |           </descriptorRefs>
28 |           <archive>
29 |             <manifest>
30 |               <mainClass>uname.GetUname</mainClass>
31 |             </manifest>
32 |           </archive>
33 |         </configuration>
34 |         <executions>
35 |           <execution>
36 |             <id>simple-command</id>
37 |             <phase>package</phase>
38 |             <goals>
39 |               <goal>attached</goal>
40 |             </goals>
41 |           </execution>
42 |         </executions>
43 |       </plugin>
44 |     </plugins>
45 |   </build>
46 | </project>
47 | 


--------------------------------------------------------------------------------
/uname/src/main/java/uname/GetUname.java:
--------------------------------------------------------------------------------
 1 | package uname;
 2 | 
 3 | import jnr.ffi.LibraryLoader;
 4 | import jnr.ffi.Runtime;
 5 | import jnr.ffi.Struct;
 6 | import jnr.ffi.annotations.Out;
 7 | import jnr.ffi.annotations.Transient;
 8 | 
 9 | public class GetUname {
10 | 	private static final int _UTS_NAME_LENGTH_ = 65;
11 | 
12 | 	/*
13 | 	 *
14 | 	 * struct utsname {
15 |          *     char sysname[];    // Operating system name (e.g., "Linux")
16 |          *     char nodename[];   // Name within "some implementation-defined network"
17 |          *     char release[];    // Operating system release (e.g., "2.6.28")
18 |          *     char version[];    // Operating system version
19 |          *     char machine[];    // Hardware identifier
20 |          * #ifdef _GNU_SOURCE
21 |          *     char domainname[]; // NIS or YP domain name
22 |          *  #endif
23 |          *  };
24 | 	 *
25 | 	 * */
26 | 	static final class UtsNameStruct extends Struct {
27 |         	public final String sysname = new AsciiString(_UTS_NAME_LENGTH_);
28 |         	public final String nodename = new AsciiString(_UTS_NAME_LENGTH_);
29 |         	public final String release = new AsciiString(_UTS_NAME_LENGTH_);
30 |         	public final String version = new AsciiString(_UTS_NAME_LENGTH_);
31 |         	public final String machine = new AsciiString(_UTS_NAME_LENGTH_);
32 | 
33 |         	public UtsNameStruct(Runtime runtime) {
34 |             		super(runtime);
35 |        		}
36 |     	}
37 | 
38 | 	public interface LibC  {
39 | 		public int uname(@Out @Transient UtsNameStruct nameStruct);
40 | 	}
41 | 
42 | 	public static void main(String[] args) {
43 | 		LibC libc = LibraryLoader.create(LibC.class).load("libc.so.6");
44 | 		Runtime runtime = Runtime.getRuntime(libc);
45 | 		UtsNameStruct nameStruct = new UtsNameStruct(runtime);
46 | 		System.out.println(libc.uname(nameStruct));
47 | 		System.out.println(nameStruct.nodename);
48 | 		System.out.println(nameStruct.sysname);
49 | 		System.out.println(nameStruct.release);
50 | 		System.out.println(nameStruct.version);
51 | 		System.out.println(nameStruct.machine);
52 | 	}
53 | }
54 | 


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