40 lines
711 B
C
40 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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