SYSTEM(3) BSD Programmer's Manual SYSTEM(3)
system - pass a command to the shell
#include <stdlib.h> int system(const char *string);
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).
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).
sh(1), execve(2), waitpid(2), popen(3)
The system() function conforms to ANSI X3.159-1989 ("ANSI C") and IEEE Std 1003.2-1992 ("POSIX.2").
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
Generated on 2013-10-31 22:57:03 by $MirOS: src/scripts/roff2htm,v 1.77 2013/01/01 20:49:09 tg Exp $
These manual pages and other documentation are copyrighted by their respective writers;
their source is available at our CVSweb,
AnonCVS, and other mirrors. The rest is Copyright © 2002‒2013 The MirOS Project, Germany.
This product includes material provided by Thorsten Glaser.
This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.