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LibC: Use the new pread syscall to implement pread
This new implementation of pread saves two lseek system calls and is thread-safe thanks to it simply forwarding the call to the pread system call.
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1 changed files with 2 additions and 6 deletions
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@ -296,12 +296,8 @@ ssize_t read(int fd, void* buf, size_t count)
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ssize_t pread(int fd, void* buf, size_t count, off_t offset)
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{
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// FIXME: This is not thread safe and should be implemented in the kernel instead.
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off_t old_offset = lseek(fd, 0, SEEK_CUR);
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lseek(fd, offset, SEEK_SET);
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ssize_t nread = read(fd, buf, count);
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lseek(fd, old_offset, SEEK_SET);
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return nread;
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int rc = syscall(SC_pread, fd, buf, count, offset);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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ssize_t write(int fd, const void* buf, size_t count)
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