NAME

stkprotect − set permissions of stack

SYNOPSIS

#include <sys/types.h>
#include <sys/mman.h>

int stkprotect(unsigned perm);

DESCRIPTION

This function sets the permissions of the stack.  Perm must be either PROT_READ|PROT_WRITE or PROT_READ|PROT_WRITE|PROT_EXEC. 

Upon successful completion of an exec(2) function, a process’s stack shall have PROT_READ|PROT_WRITE permissions.  A new process created via fork(2) shall inherit the stack permissions of its parent process. 

Under the following conditions, stkprotect fails and sets errno to:

EINVAL perm is invalid. 

DIAGNOSTICS

Upon successful completion a value of 0 is returned.  Otherwise, a value of −1 is returned and errno is set to indicate the error. 

SEE ALSO

csync(2), exec(2), fork(2), mmap(2)