assembly - sys_read call linux error values -


i new assembly programming.i have written assembly program read characters input file buffer , convert upper-case letter , generate output file.i have used int80h service read character input file.i want add functionality check error values returned sys_read call incase fails read character input file.how that?what register contain error values , values show error?

my recollection (it's been awhile since did system-call-level programming) sys_read returns either number of characters read, 0 if @ end of file, or error code less 0 in case of error, , that return value passed via usual %eax register (%rax on x86-64, think).


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