FIFO难道不会引发SIGPIPE吗？ - Chinaunix

NOTES
When a process tries to write to a FIFO that is not opened for read on
the other side, the process is sent a SIGPIPE signal.
FIFO special files can be created by mkfifo(3), and are specially indi-
cated in ls -l.
SEE ALSO
mkfifo(3), mkfifo(1), pipe(2), socketpair(2), open(2), signal(2),
sigaction(2)
Linux Man Page 1999-06-20 FIFO(4)
(END)

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EPIPE fd is connected to a pipe or socket whose reading end is closed.
When this happens the writing process will also receive a SIG-
PIPE signal. (Thus, the write return value is seen only if the
program catches, blocks or ignores this signal.)

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#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
void sigpipe( int )
{
printf( "caught signal\n" );
}
int main( int argc, char* argv[] )
{
const char* msg = "test";
mkfifo( "fifo", 00777 );
int fd = open( "fifo", O_RDWR );
if( -1 == fd )
{
perror( "open" );
return -1;
}
struct sigaction sigact;
sigact.sa_handler = sigpipe;
sigemptyset( &sigact.sa_mask );
sigact.sa_flags = 0;
if( -1 == sigaction( SIGPIPE, &sigact, NULL ) )
{
perror( "sigaction" );
return -1;
}
while( 1 )
{
// should lead to caught SIGPIPE
if( -1 == write( fd, msg, strlen( msg ) ) )
{
perror( "write" );
return -2;
}
}
return 0;
}

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原帖由 fanyunfei 于 2006-8-10 17:52 发表
because you have no set O_NONBLOCK flag, so process block until read open by other process

sorry, my system have no chinese language and my english is poor