glibc/libio/pclose.c

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#include "libioP.h"
#include "stdio.h"
#include <errno.h>
int
pclose(fp)
FILE *fp;
{
#if 0
/* Does not actually test that stream was created by popen(). Instead,
it depends on the filebuf::sys_close() virtual to Do The Right Thing. */
if (fp is not a proc_file)
return -1;
#endif
return _IO_fclose(fp);
}