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MPROTECT(2)              DragonFly System Calls Manual             MPROTECT(2)


mprotect -- control the protection of pages


Standard C Library (libc, -lc)


#include <sys/types.h> #include <sys/mman.h> int mprotect(void *addr, size_t len, int prot);


The mprotect() system call changes the specified pages to have protection prot. Not all implementations will guarantee protection on a page basis; the granularity of protection changes may be as large as an entire region. A region is the virtual address space defined by the start and end addresses of a struct vm_map_entry. Currently these protection bits are known, which can be combined, OR'd together: PROT_NONE No permissions at all. PROT_READ The pages can be read. PROT_WRITE The pages can be written. PROT_EXEC The pages can be executed.


The mprotect() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.


The mprotect() function will fail if: [EINVAL] The virtual address range specified by the addr and len arguments is not valid. [EACCES] The calling process was not allowed to change the protection to the value specified by the prot argument.


madvise(2), mincore(2), msync(2), munmap(2)


The mprotect() function first appeared in 4.4BSD. DragonFly 4.3 January 31, 2010 DragonFly 4.3

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