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#if HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#if HAVE_STDIO_H
#include <stdio.h>
#endif /* HAVE_STDIO_H */
#if HAVE_STDARG_H
#include <stdarg.h>
#endif /* HAVE_STDARG_H */
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif /* HAVE_STDLIB_H */
#if HAVE_ERRNO_H
#include <errno.h>
#endif /* HAVE_ERRNO_H */
#if HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#if HAVE_ERRNO_H
#include <errno.h>
#endif /* HAVE_ERRNO_H */
#include "sys_util.h"
#include "cgdb_clog.h"
#include "io.h"
static void process_error(void)
{
if (errno == EINTR)
clog_error(CLOG_CGDB, "ERRNO = EINTR");
else if (errno == EAGAIN)
clog_error(CLOG_CGDB, "ERRNO = EAGAIN");
else if (errno == EIO)
clog_error(CLOG_CGDB, "ERRNO = EIO");
else if (errno == EISDIR)
clog_error(CLOG_CGDB, "ERRNO = EISDIR");
else if (errno == EBADF)
clog_error(CLOG_CGDB, "ERRNO = EBADF");
else if (errno == EINVAL)
clog_error(CLOG_CGDB, "ERRNO = EINVAL");
else if (errno == EFAULT)
clog_error(CLOG_CGDB, "ERRNO = EFAULT");
}
int io_read_byte(char *c, int source)
{
int ret_val = 0;
if ((ret_val = read(source, c, 1)) == 0) {
return -1;
} else if (ret_val == -1) {
clog_error(CLOG_CGDB, "I/O error");
process_error();
return -1;
}
return 0;
}
int io_write_byte(int dest, char c)
{
if (write(dest, &c, 1) != 1)
return -1;
return 0;
}
int io_rw_byte(int source, int dest)
{
char c;
if (read(source, &c, 1) != 1) {
clog_error(CLOG_CGDB, "I/O error");
process_error();
return -1;
}
if (write(dest, &c, 1) != 1) {
clog_error(CLOG_CGDB, "I/O error");
return -1;
}
return 0;
}
ssize_t io_read(int fd, void *buf, size_t count)
{
ssize_t amountRead;
tgdb_read:
if ((amountRead = read(fd, buf, count)) == -1) { /* error */
if (errno == EINTR)
goto tgdb_read;
else if (errno != EIO) {
clog_error(CLOG_CGDB, "error reading from fd");
return -1;
} else {
return 0; /* Happens on EOF for some reason */
}
} else if (amountRead == 0) { /* EOF */
return 0;
}
return amountRead;
}
ssize_t io_writen(int fd, const void *vptr, size_t n)
{
ssize_t nwritten;
size_t nleft = n;
const char *ptr = (const char *) vptr;
while (nleft > 0) {
if ((nwritten = write(fd, ptr, nleft)) <= 0) {
if (errno == EINTR)
nwritten = 0;
else
return -1;
}
nleft -= nwritten;
ptr += nwritten;
}
return (n);
}
void io_display_char(FILE * fd, char c)
{
if (c == '\r')
fprintf(fd, "(%s)", "\\r");
else if (c == '\n')
fprintf(fd, "(%s)\n", "\\n");
else if (c == '\032')
fprintf(fd, "(%s)", "\\032");
else if (c == '\b')
fprintf(fd, "(%s)", "\\b");
else
fprintf(fd, "(%c)", c);
fflush(fd);
}
int io_data_ready(int fd, int ms)
{
int ret;
#if defined(HAVE_SYS_SELECT_H)
fd_set readfds, exceptfds;
struct timeval timeout;
struct timeval *timeout_ptr = &timeout;
FD_ZERO(&readfds);
FD_ZERO(&exceptfds);
FD_SET(fd, &readfds);
FD_SET(fd, &exceptfds);
timeout.tv_sec = ms / 1000;
timeout.tv_usec = (ms % 1000) * 1000;
/* Enforce blocking semantics if the user requested it */
if (ms == -1)
timeout_ptr = NULL;
ret = select(fd + 1, &readfds, (fd_set *) NULL, &exceptfds, timeout_ptr);
if (ret == -1) {
clog_error(CLOG_CGDB, "Errno(%d)\n", errno);
return -1;
}
if (ret <= 0)
return 0; /* Nothing to read. */
else
return 1;
#endif
}
int io_getchar(int fd, unsigned int ms, int *key)
{
char c;
int ret;
int flag = 0;
int val;
if (!key)
return -1;
val = io_data_ready(fd, ms);
if (val == -1) {
clog_error(CLOG_CGDB, "Errno(%d)\n", errno);
return -1;
}
if (val == 0)
return 0; /* Nothing to read. */
/* Set nonblocking */
flag = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flag | O_NONBLOCK);
read_again:
/* Read a char */
ret = read(fd, &c, 1);
if (ret == -1 && errno == EAGAIN)
c = 0; /* No data available */
else if (ret == -1 && errno == EINTR)
goto read_again;
else if (ret == -1) {
c = 0;
clog_error(CLOG_CGDB, "Errno(%d)\n", errno);
} else if (ret == 0) {
c = 0;
ret = -1;
clog_error(CLOG_CGDB, "Read returned nothing\n");
}
/* Set to original state */
fcntl(fd, F_SETFL, flag);
if (ret == -1)
return -1;
*key = c;
return 1;
}
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