111 lines
2.1 KiB
C
111 lines
2.1 KiB
C
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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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#ifdef HAVE_STDIO_EXT_H
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#include <stdio_ext.h>
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#endif
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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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#ifndef CLOSE_EXIT_CODE
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# define CLOSE_EXIT_CODE EXIT_FAILURE
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#endif
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static inline int
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close_stream(FILE * stream)
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{
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#ifdef HAVE___FPENDING
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const int some_pending = (__fpending(stream) != 0);
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#endif
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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 && (
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#ifdef HAVE___FPENDING
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some_pending ||
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#endif
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errno != EBADF))) {
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if (!fclose_fail && !(errno == EPIPE))
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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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static inline int
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flush_standard_stream(FILE *stream)
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{
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int fd;
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errno = 0;
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if (ferror(stream) != 0 || fflush(stream) != 0)
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goto error;
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/*
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* Calling fflush is not sufficient on some filesystems
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* like e.g. NFS, which may defer the actual flush until
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* close. Calling fsync would help solve this, but would
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* probably result in a performance hit. Thus, we work
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* around this issue by calling close on a dup'd file
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* descriptor from the stream.
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*/
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if ((fd = fileno(stream)) < 0 || (fd = dup(fd)) < 0 || close(fd) != 0)
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goto error;
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return 0;
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error:
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return (errno == EBADF) ? 0 : EOF;
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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 (flush_standard_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(CLOSE_EXIT_CODE);
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}
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if (flush_standard_stream(stderr) != 0)
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_exit(CLOSE_EXIT_CODE);
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}
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static inline void
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close_stdout_atexit(void)
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{
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/*
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* Note that close stdout at exit disables ASAN to report memory leaks
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*/
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#if !HAS_FEATURE_ADDRESS_SANITIZER
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atexit(close_stdout);
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#endif
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}
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#ifndef HAVE_FSYNC
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static inline int
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fsync(int fd __attribute__((__unused__)))
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{
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return 0;
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}
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#endif
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static inline int
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close_fd(int fd)
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{
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const int fsync_fail = (fsync(fd) != 0);
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const int close_fail = (close(fd) != 0);
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if (fsync_fail || close_fail)
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return EOF;
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return 0;
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}
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#endif /* UTIL_LINUX_CLOSESTREAM_H */
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