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#include <stdlib.h>
int
system(const char *string)
DESCRIPTION
The system() function hands the argument string to the command inter-
preter sh(1). The calling process waits for the shell to finish execut-
ing the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.
If string is a NULL pointer, system() will return non-zero. Otherwise,
system() returns the termination status of the shell in the format speci-
fied by waitpid(2).
RETURN VALUES
If a child process cannot be created, or the termination status of the
shell cannot be obtained, system() returns -1 and sets errno to indicate
the error. If execution of the shell fails, system() returns the termi-
nation status for a program that terminates with a call of exit(127).
SEE ALSO
sh(1), execve(2), waitpid(2), popen(3)
STANDARDS
The system() function conforms to ANSI C3.159-1989 (``ANSI C'') and .
BSD Experimental June 29, 1991 1
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