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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:47:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:47:53 +0000 |
commit | c8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch) | |
tree | 24e09d9f84dec336720cf393e156089ca2835791 /compat/mmap.c | |
parent | Initial commit. (diff) | |
download | git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.tar.xz git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.zip |
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compat/mmap.c')
-rw-r--r-- | compat/mmap.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/compat/mmap.c b/compat/mmap.c new file mode 100644 index 0000000..2fe1c77 --- /dev/null +++ b/compat/mmap.c @@ -0,0 +1,45 @@ +#include "../git-compat-util.h" + +void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) +{ + size_t n = 0; + + if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ) + die("Invalid usage of mmap when built with NO_MMAP"); + + if (length == 0) { + errno = EINVAL; + return MAP_FAILED; + } + + start = malloc(length); + if (!start) { + errno = ENOMEM; + return MAP_FAILED; + } + + while (n < length) { + ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n); + + if (count == 0) { + memset((char *)start+n, 0, length-n); + break; + } + + if (count < 0) { + free(start); + errno = EACCES; + return MAP_FAILED; + } + + n += count; + } + + return start; +} + +int git_munmap(void *start, size_t length) +{ + free(start); + return 0; +} |