Blame src/internal/slibtool_mapfile_impl.c
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "slibtool_mapfile_impl.h"
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static void slbt_munmap(void * addr, size_t size)
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{
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if (addr) {
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munmap(addr,size);
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}
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}
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struct slbt_map_info * slbt_map_file(
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int fdat,
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const char * path,
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uint32_t flags)
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{
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int fd;
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void * addr;
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struct stat st;
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uint32_t oflag;
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uint32_t mprot;
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struct slbt_map_info * mapinfo;
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if ((flags & SLBT_MAP_INPUT) && (flags & SLBT_MAP_OUTPUT)) {
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oflag = O_RDWR;
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mprot = PROT_READ|PROT_WRITE;
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} else if (flags & SLBT_MAP_INPUT) {
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oflag = O_RDONLY;
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mprot = PROT_READ;
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} else if (flags & SLBT_MAP_OUTPUT) {
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oflag = O_WRONLY;
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mprot = PROT_WRITE;
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} else {
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errno = EINVAL;
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return 0;
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}
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if ((fd = openat(fdat,path,oflag,0)) < 0)
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return 0;
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if (fstat(fd,&st) < 0) {
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close(fd);
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return 0;
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}
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addr = st.st_size
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? mmap(0,st.st_size,mprot,MAP_SHARED,fd,0)
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: 0;
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if (addr == MAP_FAILED) {
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close(fd);
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return 0;
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}
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if (!(mapinfo = malloc(sizeof(*mapinfo)))) {
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close(fd);
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slbt_munmap(addr,st.st_size);
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return 0;
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}
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close(fd);
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mapinfo->addr = addr;
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mapinfo->size = st.st_size;
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return mapinfo;
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}
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void slbt_unmap_file(struct slbt_map_info * mapinfo)
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{
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slbt_munmap(mapinfo->addr,mapinfo->size);
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free(mapinfo);
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}
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