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https://github.com/git/git.git
synced 2024-12-18 06:14:59 +08:00
bf1e6da791
in f48000fc ("Yank writing-back support from gitfakemmap.", 2005-10-08)
support for writting back changes was removed but the specific prot
flag that would be used was not checked for
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
41 lines
711 B
C
41 lines
711 B
C
#include "../git-compat-util.h"
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void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
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{
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size_t n = 0;
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if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ)
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die("Invalid usage of mmap when built with NO_MMAP");
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start = xmalloc(length);
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if (start == NULL) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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while (n < length) {
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ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n);
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if (count == 0) {
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memset((char *)start+n, 0, length-n);
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break;
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}
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if (count < 0) {
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free(start);
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errno = EACCES;
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return MAP_FAILED;
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}
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n += count;
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}
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return start;
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}
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int git_munmap(void *start, size_t length)
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{
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free(start);
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return 0;
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}
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