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check if a com port exists by C code

How can we check if a com port exists by C code?
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I don't know how to check using c, but they should be under /dev listed as ttys0-ttys3
com ports are character devices.  As a character device is initialized, its device driver registers itself with the linux kernel by adding an entry into the chrdevs vector of device_struct data structure.  You can call a device and tread it exaclty like a file.  operation on a character device include iseek,read,write,readdir,select,ioctl .... etc.
you can use the open function with O_RDONLY, O_WRONLY, or O_RDWR
do a man on open to get details and header files needed.
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