include: add stream error checking facility
The close_stream() is copied from GNU lib. Inspiration to do this is talk by Jim Meyering - Goodbye World! The perils of relying on output streams in C. Reference: http://www.irill.org/events/ghm-gnu-hackers-meeting/videos/jim-meyering-goodbye-world-the-perils-of-relying-on-output-streams-in-c Signed-off-by: Sami Kerola <kerolasa@iki.fi>
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@ -7,6 +7,7 @@ dist_noinst_HEADERS = \
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c.h \
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canonicalize.h \
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carefulputc.h \
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closestream.h \
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cpuset.h \
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crc32.h \
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env.h \
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@ -0,0 +1,41 @@
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#ifndef UTIL_LINUX_CLOSESTREAM_H
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#define UTIL_LINUX_CLOSESTREAM_H
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <unistd.h>
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#include "c.h"
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#include "nls.h"
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static inline int
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close_stream(FILE * stream)
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{
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const int some_pending = (__fpending(stream) != 0);
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const int prev_fail = (ferror(stream) != 0);
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const int fclose_fail = (fclose(stream) != 0);
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if (prev_fail || (fclose_fail && (some_pending || errno != EBADF))) {
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if (!fclose_fail)
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errno = 0;
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return EOF;
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}
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return 0;
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}
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/* Meant to be used atexit(close_stdout); */
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static inline void
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close_stdout(void)
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{
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if (close_stream(stdout) != 0 && !(errno == EPIPE)) {
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if (errno)
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warn(_("write error"));
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else
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warnx(_("write error"));
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_exit(EXIT_FAILURE);
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}
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if (close_stream(stderr) != 0)
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_exit(EXIT_FAILURE);
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}
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#endif /* UTIL_LINUX_CLOSESTREAM_H */
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