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Top Forums Programming read, write & STDOUT_FILENO.... Post 24511 by M3xican on Friday 12th of July 2002 07:42:18 PM
Old 07-12-2002
Question read, write & STDOUT_FILENO....

hi guys, I'have a question 4 u.

Why this code give me the right output (an integer on the stdout):

Code:
read(fd,&mpid,sizeof(pid_t));
printf("%d\n",mpid);

Instead this code give me only a blank line:

Code:
read(fd,&mpid,sizeof(pid_t));
write(STDOUT_FILENO,&mpid,sizeof(pid_t));

?????

The "fd" file descriptor points to a fifo, but I think this isn't important cause I've got the same problem if i try reading from a normal file.
 

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putws(3C)                                                  Standard C Library Functions                                                  putws(3C)

NAME
putws - convert a string of Process Code characters to EUC characters SYNOPSIS
#include <stdio.h> #include <widec.h> int putws(wchar_t *s); DESCRIPTION
The putws() function converts the Process Code string (terminated by a (wchar_t)NULL) pointed to by s, to an Extended Unix Code (EUC) string followed by a NEWLINE character, and writes it to the standard output stream stdout. It does not write the terminal null character. RETURN VALUES
The putws() function returns the number of Process Code characters transformed and written. It returns EOF if it attempts to write to a file that has not been opened for writing. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
ferror(3C), fopen(3C), fread(3C), getws(3C), printf(3C), putwc(3C), attributes(5) SunOS 5.10 22 Apr 1997 putws(3C)
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