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MPROTECT(2) BSD System Calls Manual MPROTECT(2) NAME mprotect -- control the protection of pages LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/mman.h> int mprotect(const void *addr, size_t len, int prot); DESCRIPTION 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 re- gion. 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. RETURN VALUES 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. ERRORS The mprotect() system call 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 pro- tection to the value specified by the prot argument. SEE ALSO madvise(2), mincore(2), msync(2), munmap(2) HISTORY The mprotect() system call first appeared in 4.4BSD. BSD June 9, 1993 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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