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51 lines
1.1 KiB
51 lines
1.1 KiB
3 months ago
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/*
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* UCW Library -- Mapping of Files
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*
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* (c) 1999--2012 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/io.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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void *
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mmap_file(const char *name, size_t *len, int writeable)
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{
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int fd = ucw_open(name, writeable ? O_RDWR : O_RDONLY);
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ucw_stat_t st;
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void *x;
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if (fd < 0)
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die("open(%s): %m", name);
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if (ucw_fstat(fd, &st) < 0)
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die("fstat(%s): %m", name);
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if ((uintmax_t)st.st_size > SIZE_MAX)
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die("mmap(%s): File too large", name);
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if (len)
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*len = st.st_size;
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if (st.st_size)
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{
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x = mmap(NULL, st.st_size, writeable ? (PROT_READ | PROT_WRITE) : PROT_READ, MAP_SHARED, fd, 0);
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if (x == MAP_FAILED)
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die("mmap(%s): %m", name);
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}
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else /* For empty file, we can return any non-zero address */
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x = "";
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close(fd);
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return x;
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}
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void
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munmap_file(void *start, size_t len)
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{
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munmap(start, len);
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}
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