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Fork and Exec

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(1)

A Unix Process

Text Process Status Resources Resources File UNIX kernel Stack Data File

(2)

How Fork Works

Text Process Status Stack Data File File Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); pid = 25

(3)

pid = 26

How Fork Works

UNIX kernel Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25

(4)

pid = 26

How Fork Works

Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(5)

pid = 26

How Fork Works

UNIX kernel Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(6)

pid = 26

How Fork Works

Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(7)

pid = 26

How Fork Works

UNIX kernel Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(8)

pid = 26

How Fork Works

Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(9)

pid = 26

How Fork Works

UNIX kernel Text Process Status Stack Data File File Stack Data Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status pid = 25 cpid = 26 cpid = 0

(10)

How Fork Works

Text Process Status Stack Data File File Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); pid = 25 cpid = 26

(11)

How Fork Works

UNIX kernel Text Process Status Stack Data File File Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); pid = 25 cpid = 26

(12)

How Fork Works

Text Process Status Stack Data File File Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); pid = 25 cpid = 26

(13)

How Fork Works

UNIX kernel Text Process Status Stack Data File File Resources Resources <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); <…> pid = 25 cpid = 26

(14)

pid = 26

How Exec Works

File File Stack Data Resources Resources Text <…>

int cpid = fork( ); if (cpid = = 0) { <child code> exit(0); } <parent code> wait(cpid); Process Status cpid = 0

(15)

pid = 26

How Exec Works

UNIX kernel File File Stack Data Resources Resources Text <…>

int cpid = fork( ); if (cpid = = 0) { exec(“foo”); exit(0); } <parent code> wait(cpid); Process Status cpid = 0 foo

(16)

pid = 26

How Exec Works

File File Stack Data Resources Resources Text <…>

int cpid = fork( ); if (cpid = = 0) { exec(“foo”); exit(0); } <parent code> wait(cpid); Process Status cpid = 0

(17)

pid = 26

How Exec Works

UNIX kernel foo File File Resources Resources

(18)

pid = 26

How Exec Works

Stack Data Text

<line first of foo> <…> <…> <…> exit(0); Process Status File File Resources Resources

(19)

pid = 26

How Exec Works

UNIX kernel

Stack Data Text

<line first of foo> <…> <…> <…> exit(0); Process Status File File Resources Resources

(20)

pid = 26

How Exec Works

Stack Data Text

<line first of foo> <…> <…> <…> exit(0); Process Status File File Resources Resources

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