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SYSTEM(3)	       FreeBSD 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.

FreeBSD	11.1			 June 4, 1993			  FreeBSD 11.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS

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