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They are much more widely used on POSIX operating systems (which
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They are much more widely used on POSIX operating systems (which
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should define all of those listed here), which also support a
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should define all of those listed here), which also support a
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\code{kill} system call to send a signal to a process, most often to
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\code{kill} system call to send a signal to a process, most often to
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terminate it. Function \code{pskill} provides a wrapper: it silently
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terminate it. Function \code{pskill} provides a wrapper: it silently
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ignores invalid values of its arguments, including zero or negative pids.
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ignores invalid values of its arguments, including zero or negative pids.
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In normal use on a Unix-alike, \kbd{Ctrl-C} sends \code{SIGINT},
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In normal use on a Unix-alike, \kbd{Ctrl-C} sends \code{SIGINT},
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\kbd{Ctrl-\\} sends \code{SIGQUIT} and \kbd{Ctrl-Z} sends
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\kbd{Ctrl-\\} sends \code{SIGQUIT} and \kbd{Ctrl-Z} sends
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\code{SIGTSTP}: that and \code{SIGSTOP} suspend a process which can be
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\code{SIGTSTP}: that and \code{SIGSTOP} suspend a process which can be
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resumed by \code{SIGCONT}.
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resumed by \code{SIGCONT}.
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The signals are small integers, but the actual numeric values are not
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The signals are small integers, but the actual numeric values are not
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standardized (and most do differ between OSes). The \code{SIG*}
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standardized (and most do differ between OSes). The \code{SIG*}
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objects contain the appropriate integer values for the current platform
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objects contain the appropriate integer values for the current platform
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(or \code{NA_INTEGER_} if the signal is not defined).
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(or \code{NA_INTEGER_} if the signal is not defined).
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