Manpage of SYSTEM
SYSTEM
Section: NEWLIB (3)
Updated: 2005 Feb 23
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NAME
1.36 `system'--execute command string
SYNOPSIS
#include <stdlib.h>
int system(char *S);
int _system_r(void *REENT, char *S);
DESCRIPTION
Use `system' to pass a command string `*S' to `/bin/sh' on your system,
and wait for it to finish executing.
Use "`system(NULL)'" to test whether your system has `/bin/sh'
available.
The alternate function `_system_r' is a reentrant version. The
extra argument REENT is a pointer to a reentrancy structure.
RETURNS
`system(NULL)' returns a non-zero value if `/bin/sh' is available, and
`0' if it is not.
With a command argument, the result of `system' is the exit status
returned by `/bin/sh'.
PORTABILITY
ANSI C requires `system', but leaves the nature and effects of a
command processor undefined. ANSI C does, however, specify that
`system(NULL)' return zero or nonzero to report on the existence of a
command processor.
POSIX.2 requires `system', and requires that it invoke a `sh'.
Where `sh' is found is left unspecified.
Supporting OS subroutines required: `_exit', `_execve', `_fork_r',
`_wait_r'.
SEE ALSO
system
is part of the
libc
library.
The full documentation for
libc
is maintained as a Texinfo manual. If
info
and
libc
are properly installed at your site, the command
-
info libc
will give you access to the complete manual.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURNS
-
- PORTABILITY
-
- SEE ALSO
-
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Time: 21:25:32 GMT, May 16, 2005
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