Current File : //usr/share/systemtap/tapset/linux/syscall_table.stp
# This is syscall_table tapset providing namely syscall_name() and syscall_num()
# functions. It uses architecture specific data contained in other arch
# specific tapsets. Helper scripts/dump-syscalls.sh is used to generate those.
function syscall_name(num) {
%( CONFIG_COMPAT == "y" %?
if (@__compat_task)
return __syscall_32_num2name[num]
%)
%( CONFIG_64BIT == "y" %?
return __syscall_64_num2name[num]
%:
return __syscall_32_num2name[num]
%)
}
# Systemtap is benevolent when an associative array is being queried for an
# unexisting key. If we call e.g. __syscall_64_name2num["unexisting_syscall"],
# the result is zero. But at the same time zero is a valid syscall number, so
# we really need to return some other value in this case to indicate that
# syscall with given name doesn't exist. Let's use following
# @return_sanitized macro.
#
# The other way round, when evaluating e.g. __syscall_64_num2name[-123], stap
# is benevolent too - we'll get an empty string. But that is sufficiently
# unique, so we are good at this front.
@define return_sanitized(indexable, key)
%(
if (@key in @indexable)
return @indexable[@key]
else
return -1
%)
function syscall_num(name) {
%( CONFIG_COMPAT == "y" %?
if (@__compat_task)
@return_sanitized(__syscall_32_name2num, name)
%)
%( CONFIG_64BIT == "y" %?
@return_sanitized(__syscall_64_name2num, name)
%:
@return_sanitized(__syscall_32_name2num, name)
%)
}
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