Date: Sat, 21 May 2005 12:36:05 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-standards@freebsd.org Subject: Read /dev/null differs from POSIX Message-ID: <20050521193605.GB51782@troutmask.apl.washington.edu>
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>From http://www.opengroup.org/onlinepubs/009695399/toc.htm /dev/null -- An infinite data source and data sink. Data written to /dev/null shall be discarded. Reads from /dev/null shall always return end-of-file (EOF). This program #include <stdio.h> int main(void) { int i=0,j; FILE *fp; fp = fopen("/dev/null", "r"); while(fread(&j, sizeof(int), 1, fp) != 1) { i++; if (i == 5) break; } printf("i = %d\n", i); if (j == EOF) printf("EOF\n"); else printf("j = %d\n", j); } prints i = 5 j = 1 Is this historic BSD defacto behavior? -- Steve
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