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FUNCTION |
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<>---execute command string |
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INDEX |
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system |
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INDEX |
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_system_r |
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ANSI_SYNOPSIS |
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#include |
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int system(char *<[s]>); |
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int _system_r(void *<[reent]>, char *<[s]>); |
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TRAD_SYNOPSIS |
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#include |
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int system(<[s]>) |
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char *<[s]>; |
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int _system_r(<[reent]>, <[s]>) |
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char *<[reent]>; |
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char *<[s]>; |
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DESCRIPTION |
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Use <> to pass a command string <<*<[s]>>> to <> on |
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your system, and wait for it to finish executing. |
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Use ``<>'' to test whether your system has <> |
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available. |
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The alternate function <<_system_r>> is a reentrant version. The |
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extra argument <[reent]> is a pointer to a reentrancy structure. |
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RETURNS |
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<> returns a non-zero value if <> is available, and |
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<<0>> if it is not. |
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With a command argument, the result of <> is the exit status |
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returned by <>. |
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PORTABILITY |
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ANSI C requires <>, but leaves the nature and effects of a |
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command processor undefined. ANSI C does, however, specify that |
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<> return zero or nonzero to report on the existence of |
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a command processor. |
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POSIX.2 requires <>, and requires that it invoke a <>. |
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Where <> is found is left unspecified. |
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Supporting OS subroutines required: <<_exit>>, <<_execve>>, <<_fork_r>>, |
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<<_wait_r>>. |
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*/ |
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#include <_ansi.h> |
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#include |
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#include |
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#include |
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#include |
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#include <_syslist.h> |
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#include |
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int |
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_DEFUN(_system_r, (ptr, s), |
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struct _reent *ptr _AND |
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_CONST char *s) |
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{ |
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if (s == NULL) |
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return 0; |
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errno = ENOSYS; |
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return -1; |
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} |
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#ifndef _REENT_ONLY |
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int |
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_DEFUN(system, (s), |
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_CONST char *s) |
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{ |
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return _system_r (_REENT, s); |
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} |
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#endif |