A tool called sysfinder can be used to locate a syscall in a specific Glibc version starting from a given symbol. It gathers data using Radare 2 and displays a list of the syscalls along with sample routes to reach them.
Syscall finder
-s specifies the symbol where the search starts
-f specifies library path
-p print profiler data
-t print terse data
-h this help
usage: ./sysfinder -f libc.so.6 -s sym.malloc
A simple usage requires specifying both the Glibc binary file (currently ARM and x86 are supported) and a symbol for starting the search.
To use the tool, the symbol must be stated using the Radare format, which is the 'nm' symbol followed by the word'sym.'
The option -t for terse output allows printing only the syscall list and omitting the path samples list.
The option -p is for profiling, not meant to be used in any context different from developing.