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MPROTECT(2) 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 region. The protections (region accessibility) are specified in the prot argument by OR'ing the following values: PROT_EXEC Pages may be executed. PROT_READ Pages may be read. PROT_WRITE Pages may be written. PROT_NONE No permissions. RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS [EACCES] A memory protection violation occurred, or the PROT_EXEC flag was attempted on pages which belong to a filesystem mounted with the NOEXEC flag. [EINVAL] An invalid memory range, or invalid parameters were provided. [ENOMEM] A resource shortage occurred while internally calling uvm_map_protect(9). SEE ALSO madvise(2), mincore(2), msync(2), munmap(2) HISTORY The mprotect() function first appeared in 4.4BSD. NetBSD 7.1.2 April 3, 2011 NetBSD 7.1.2