source: azure_iot_hub/trunk/musl-1.1.18/src/time/__map_file.c@ 388

Last change on this file since 388 was 388, checked in by coas-nagasima, 5 years ago

Azure IoT Hub Device C SDK を使ったサンプルの追加
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-csrc
File size: 542 bytes
Line 
1#include <sys/mman.h>
2#include <fcntl.h>
3#include <sys/stat.h>
4#include "syscall.h"
5
6void *__mmap(void *, size_t, int, int, int, off_t);
7
8const char unsigned *__map_file(const char *pathname, size_t *size)
9{
10 struct stat st;
11 const unsigned char *map = MAP_FAILED;
12 int fd = __sys_open(pathname, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
13 if (fd < 0) return 0;
14 if (!__syscall(SYS_fstat, fd, &st)) {
15 map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
16 *size = st.st_size;
17 }
18 __syscall(SYS_close, fd);
19 return map == MAP_FAILED ? 0 : map;
20}
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