DragonFly On-Line Manual Pages


SYSTEM(3)	      DragonFly Library Functions Manual	     SYSTEM(3)

NAME

system -- pass a command to the shell

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#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 if the command interpreter sh(1) is available, and zero if it is not.

RETURN VALUES

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.

SEE ALSO

sh(1), execve(2), fork(2), waitpid(2), popen(3)

STANDARDS

The system() function conforms to ISO/IEC 9899:1990 (``ISO C90'') and is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. DragonFly 3.9 June 4, 1993 DragonFly 3.9