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MPROTECT(2) BSD System Calls Manual MPROTECT(2)
mprotect -- control the protection of pages
Standard C Library (libc, -lc)
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.
The protections (region accessibility) are specified in the prot argument by OR'ing the fol-
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.
[EACCES] A memory protection violation occurred, or the PROT_EXEC flag was
attempted on pages which belong to a filesystem mounted with the NOEXEC
[EINVAL] An invalid memory range, or invalid parameters were provided.
[ENOMEM] A resource shortage occurred while internally calling uvm_map_protect(9).
madvise(2), mincore(2), msync(2), munmap(2)
The mprotect() function first appeared in 4.4BSD.
BSD April 3, 2011 BSD
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