MPROTECT(2) BSD Programmer's Manual MPROTECT(2)
mprotect - control the protection of pages
#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 re- gion. 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.
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
madvise(2), mincore(2), msync(2), munmap(2)
The mprotect() function first appeared in 4.4BSD. MirOS BSD #10-current June 9, 1993 1
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