==== MFSH_SEGALLOC - Allocate a segment ====

**Purpose**

Allocate memory.   

**Calling Sequence**

<code c>
int far pascal MFSH_SEGALLOC(usFlag, cbSeg, pusSel)

unsigned short usFlag;
unsigned long cbSeg;
unsigned short far * pusSel;
</code>

**Where**

//usFlag// is set to 1 if the memory must be below the 1-meg boundary or 0 if its location does not matter.   

//cbSeg// contains the length of the segment.   

//pusSel// is a pointer to a word in which the helper returns the selector of the segment. 

**Returns**

If no error is detected, a zero error code is returned. If an error is detected, one of the following error codes is returned:   

  * ERROR_NOT_ENOUGH_MEMORY -- too much memory is allocated. 
  * ERROR_PROTECTION_VIOLATION -- the supplied address is invalid. 
  * ERROR_INVALID_PARAMETER -- either the supplied flag or length is invalid. 

**Remarks**

This function allocates memory with the following attributes:   

  * Allocated from the GDT
  * Non-swappable 

Memory not allocated specifically below the 1-Meg boundary may be given to the FSD by passing the selectors through //pMiniFSD// (see //MFS_INIT// and //FS_INIT//).