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Full Discussion: I can print ""
Top Forums Programming I can print "" Post 302186878 by DreamWarrior on Friday 18th of April 2008 10:28:27 AM
Old 04-18-2008
Can I ask why you are using the system call from C to write to a file in the first place? You do realize that there exists a slew of API calls that are much more efficient than creating a new process to write a single line of text to a file.

Code:
FILE *fp;

fp = fopen("a.xml", "wt");
fprintf(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
fclose(fp);

Would be much better and you can even continuing writing XML to file instead of closing it.
 

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FCLOSE(3)						     Linux Programmer's Manual							 FCLOSE(3)

NAME
fclose - close a stream SYNOPSIS
#include <stdio.h> int fclose(FILE *fp); DESCRIPTION
The fclose() function will flushes the stream pointed to by fp (writing any buffered output data using fflush(3)) and closes the underlying file descriptor. RETURN VALUE
Upon successful completion 0 is returned. Otherwise, EOF is returned and errno is set to indicate the error. In either case any further access (including another call to fclose()) to the stream results in undefined behavior. ERRORS
EBADF The file descriptor underlying fp is not valid. The fclose() function may also fail and set errno for any of the errors specified for the routines close(2), write(2) or fflush(3). CONFORMING TO
C89, C99. NOTES
Note that fclose() only flushes the user space buffers provided by the C library. To ensure that the data is physically stored on disk the kernel buffers must be flushed too, for example, with sync(2) or fsync(2). SEE ALSO
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2009-02-23 FCLOSE(3)
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