SYSTEM(3) Library Functions Manual SYSTEM(3)NAME
system - issue a shell command
SYNOPSIS
system(string)
char *string;
DESCRIPTION
System causes the string to be given to sh(1) as input as if the string had been typed as a command at a terminal. The current process
waits until the shell has completed, then returns the exit status of the shell.
SEE ALSO popen(3), exec(2), wait(2)DIAGNOSTICS
Exit status 127 indicates the shell couldn't be executed.
SYSTEM(3)
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SYSTEM(3) BSD 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 interpreter 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 is available, or zero if none is available. Other-
wise, system() returns 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 indi-
cate the error. If execution of the shell fails, system() returns the termination status for a program that terminates with a call of
exit(127).
SEE ALSO sh(1), execve(2), waitpid(2), popen(3), shquote(3)STANDARDS
The system() function conforms to ANSI X3.159-1989 (``ANSI C89'') 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.
BSD August 2, 2007 BSD
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