system man page on MirBSD

system man page on MirBSD

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SYSTEM(3)		   BSD Programmer's Manual		     SYSTEM(3)

NAME
     system - pass a command to the shell

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 executing
     the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.

     If string is NULL, system() will return non-zero. Otherwise, system() re-
     turns the termination status of the shell in the format specified 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 termina-
     tion 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 X3.159-1989 ("ANSI C") and IEEE
     Std 1003.2-1992 ("POSIX.2").

CAVEATS
     Never supply the system() function with a command containing any part of
     an unsanitized user-supplied string. Shell meta-characters present will
     be honored by the sh(1) command interpreter.

MirOS BSD #10-current		June 29, 1991				     1

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