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MPROTECT(2) FreeBSD 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(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. FreeBSD 13.0 August 3, 2016 FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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