system
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/system.html
Gnulib module: system-posix
Portability problems fixed by Gnulib:
WIFSIGNALED, WIFEXITED, WIFSTOPPED,
WTERMSIG, WEXITSTATUS, WNOHANG, WUNTRACED,
WSTOPSIG are not defined in <stdlib.h> (only in
<sys/wait.h>) on some platforms:
MirBSD 10.
Portability problems not fixed by Gnulib:
system function is cmd.exe, not /bin/sh. Accordingly,
the rules for quoting shell arguments containing spaces, quote or other special
characters are different.