Rich Felker
594c827a22
open is handled specially because it is used from so many places, in so many variants (2 or 3 arguments, setting errno or not, and cancellable or not). trying to do it as a function would not only increase bloat, but would also risk subtle breakage. this is the first step towards supporting "new" archs where linux lacks "old" syscalls.
20 lines
536 B
C
20 lines
536 B
C
#include <sys/mman.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include "syscall.h"
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void *__mmap(void *, size_t, int, int, int, off_t);
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const char unsigned *__map_file(const char *pathname, size_t *size)
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{
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struct stat st;
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const unsigned char *map = MAP_FAILED;
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int fd = __sys_open(pathname, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
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if (fd < 0) return 0;
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if (!__syscall(SYS_fstat, fd, &st))
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map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
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__syscall(SYS_close, fd);
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*size = st.st_size;
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return map == MAP_FAILED ? 0 : map;
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}
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