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mvalid(2) System Calls Manual mvalid(2) NAME mvalid - Checks memory region for validity SYNOPSIS #include <sys/types.h> #include <sys/mman.h> int mvalid ( caddr_t addr, size_t len, int prot ); PARAMETERS Specifies the address of the region whose validity is to be checked. Specifies length in bytes of the region specified by the addr parame- ter. Specifies the desired access protection for the region. DESCRIPTION The mvalid() function checks the validity of a memory region. A region is considered to be valid if accesses of the requested type are allowed to all addresses in the region. The sys/mman.h header file defines the following access options: The mapped region can be read. The mapped region can be written. The mapped region can be executed. The prot parameter can be any combination of PROT_READ, PROT_WRITE, and PROT_EXEC ORed together. RETURN VALUES The mvalid() function returns 0 (zero) if accesses requiring the speci- fied protection are allowed to all addresses within the specified range of addresses. Otherwise, the mvalid() function returns -1 and sets er- rno to indicate the error. ERRORS If the mvalid() function fails, errno may be set to one of the follow- ing values: The range specified by [addr, addr + len) is invalid for the process' address space, or the range specifies one or more unmapped pages, or one or more pages of the range disallows accesses of the specified protection. The prot parameter is invalid, or the addr para- meter is not a multiple of the page size as returned by sysconf(_SC_PAGE_SIZE). RELATED INFORMATION Functions: mmap(2), mprotect(2), sysconf(3) delim off mvalid(2)