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explain why we use mmap instead of malloc

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Denis Vlasenko 2007-12-02 07:18:29 +00:00
parent 8723a94c25
commit 8003e266ed
1 changed files with 2 additions and 0 deletions
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libbb/copyfd.c
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@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
char *buffer; char *buffer;
int buffer_size; int buffer_size;
/* We want page-aligned buffer, just in case kernel is clever
* and can do page-aligned io more efficiently */
buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024, buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
PROT_READ | PROT_WRITE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, MAP_PRIVATE | MAP_ANON,