system(3) BSD Library Functions Manual system(3)
system -- pass a command to the shell
Standard C Library (libc, -lc)
#include <stdlib.h> int system(const char *command);
The system() function hands the argument command 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 command is a NULL pointer, system() will return non-zero if the com- mand interpreter sh(1) is available, and zero if it is not.
The system() function returns the exit status of the shell as returned by waitpid(2), or -1 if an error occurred when invoking fork(2) or waitpid(2). A return value of 127 means the execution of the shell failed.
The system() function conforms to ISO/IEC 9899:1990 (``ISO C90'') and is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD June 4, 1993 BSD
Mac OS X 10.8 - Generated Fri Aug 31 15:46:27 CDT 2012