_dos_freemem() in c

_dos_freemem() Frees a previously allocated DOS memory block
Declaration:
unsigned _dos_freemem(unsigned segx);
Remarks:
_dos_freemem frees a memory block allocated by a previous call to _dos_allocmem.
segx is the segment address of the block.
Return Value:
On success, both functions return 0 On error,_dos_freemem returns the DOS error code and sets errno to
ENOMEM (Bad memory pointer) freemem returns -1 and sets errno to ENOMEM (Insufficient memory)

Program

#include <dos.h> #include <stdio.h> int main(void) {   unsigned int size, segp, err, maxb;   size = 64; /* (64 x 16) = 1024 bytes */   err = _dos_allocmem(size, &segp);   if (err == 0)     printf("Allocated memory at segment: %x\n", segp);   else {     perror("Unable to allocate block");     printf("Maximum no. of paragraphs available is %u\n", segp);     return 1;   }   if (_dos_setblock(size * 2, segp, &maxb) == 0)     printf("Expanded memory block at segment: %X\n", segp);   else {     perror("Unable to expand block");     printf("Maximum no. of paragraphs available is %u\n", maxb);   }   _dos_freemem(segp);   return 0; }

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