Mail Archives: cygwin/2009/12/22/17:43:39
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I am experiencing a problem with select() and named pipes in cygwin 1.7.
The attached test case segfaults on the select() call, but works fine
with both cygwin 1.5 and linux.
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Enrico
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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define FIFONAME "/tmp/pipe"
int main(void)
{
int fd;
int nsel;
fd_set readfds;
FD_ZERO(&readfds);
if (mkfifo(FIFONAME, 0600) < 0) {
perror("mkfifo");
exit(1);
}
fd = open(FIFONAME, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
perror("open");
remove(FIFONAME);
exit(2);
}
FD_SET(fd, &readfds);
do {
nsel = select(fd + 1, &readfds, 0, 0, 0);
} while (nsel == -1 && (errno == EINTR || errno == EAGAIN));
if (nsel == -1) {
perror("select");
exit(3);
}
if (FD_ISSET(fd, &readfds)) {
char buf[100];
int status;
while ((status = read(fd, buf, sizeof(buf) - 1))) {
if (status > 0) {
buf[status] = '\0';
printf("%s", buf);
} else {
printf("\n");
if (errno != EAGAIN)
perror("read");
break;
}
}
}
close(fd);
remove(FIFONAME);
return 0;
}
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