int
system(
const char *string
)
)
function
hands the argument
string
to the command interpreter
sh(1).
The calling process waits for the shell to finish executing the command,
ignoring
SIGINT
and
SIGQUIT
,
and blocking
SIGCHLD
.
If
string
is a
NULL
pointer,
system()
will return non-zero, if the command interpreter is available, or zero if none
is available.
Otherwise,
system(
)
returns the termination status of the shell in the format specified by
waitpid(2).
)
returns -1 and sets
errno
to indicate the error.
If execution of the shell fails,
system(
)
returns the termination status for a program that terminates with a call of
exit(
127
).
)
function
conforms to
ANSI X3.159-1989 (``ANSI C89'')
and
IEEE Std 1003.2-1992 (``POSIX.2'') .
)
function with a command containing any part of an unsanitized user-supplied
string.
Shell meta-characters present will be honored by the
sh(1)
command interpreter.