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76 lines
2.2 KiB
76 lines
2.2 KiB
/* This software was written by Dirk Engling <erdgeist@erdgeist.org> |
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It is considered beerware. Prost. Skol. Cheers or whatever. |
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$id$ */ |
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/* System */ |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/uio.h> |
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/* Libowfat */ |
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/* Opentracker */ |
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#include "ot_iovec.h" |
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void *iovec_increase( int *iovec_entries, struct iovec **iovector, size_t new_alloc ) { |
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void *new_ptr = realloc( *iovector, (1 + *iovec_entries ) * sizeof( struct iovec ) ); |
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if( !new_ptr ) |
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return NULL; |
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*iovector = new_ptr; |
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new_ptr = mmap( NULL, new_alloc, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0 ); |
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if( !new_ptr ) |
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return NULL; |
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((*iovector)[*iovec_entries]).iov_base = new_ptr; |
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((*iovector)[*iovec_entries]).iov_len = new_alloc; |
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++*iovec_entries; |
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return new_ptr; |
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} |
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void iovec_free( int *iovec_entries, struct iovec **iovector ) { |
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int i; |
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for( i=0; i<*iovec_entries; ++i ) |
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munmap( ((*iovector)[i]).iov_base, ((*iovector)[i]).iov_len ); |
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*iovec_entries = 0; |
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} |
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void iovec_fixlast( int *iovec_entries, struct iovec **iovector, void *last_ptr ) { |
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int page_size = getpagesize(); |
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size_t old_alloc, new_alloc, old_pages, new_pages; |
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char * base = (char*)((*iovector)[ *iovec_entries - 1 ]).iov_base; |
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if( !*iovec_entries ) return; |
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old_alloc = ((*iovector)[ *iovec_entries - 1 ]).iov_len; |
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new_alloc = ((char*)last_ptr) - base; |
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old_pages = 1 + old_alloc / page_size; |
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new_pages = 1 + new_alloc / page_size; |
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if( old_pages != new_pages ) |
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munmap( base + new_pages * page_size, old_alloc - new_pages * page_size ); |
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((*iovector)[*iovec_entries - 1 ]).iov_len = new_alloc; |
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} |
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void *iovec_fix_increase_or_free( int *iovec_entries, struct iovec **iovector, void *last_ptr, size_t new_alloc ) { |
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void *new_ptr; |
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iovec_fixlast( iovec_entries, iovector, last_ptr ); |
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if( !( new_ptr = iovec_increase( iovec_entries, iovector, new_alloc ) ) ) |
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iovec_free( iovec_entries, iovector ); |
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return new_ptr; |
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} |
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size_t iovec_length( int *iovec_entries, struct iovec **iovector ) { |
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size_t length = 0; |
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int i; |
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for( i=0; i<*iovec_entries; ++i ) |
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length += ((*iovector)[i]).iov_len; |
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return length; |
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} |
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const char *g_version_iovec_c = "$Source$: $Revision$\n";
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