/** \file fd.c helper functions for file descriptor handling */
#include "para.h"
+
+#include <fcntl.h>
+#include <sys/select.h>
+
#include "error.h"
/**
* check whether a file exists
err = errno;
} while (ret < 0 && err == EINTR);
if (ret < 0)
- PARA_CRIT_LOG("select error (%s)\n", strerror(err));
+ PARA_CRIT_LOG("select error: %s, max_fileno: %d\n",
+ strerror(err), n);
return ret;
}
return 1;
}
+/**
+ * set a file descriptor in a fd_set
+ *
+ * \param fd the file descriptor to be set
+ * \param fds the file descriptor set
+ * \param max_fileno highest-numbered file descriptor
+ *
+ * This wrapper for FD_SET() passes its first two arguments to \p FD_SET. Upon
+ * return, \a max_fileno contains the maximum of the old_value and \a fd.
+ *
+ * \sa para_select
+*/
+void para_fd_set(int fd, fd_set *fds, int *max_fileno)
+{
+ if (fd < 0 || fd >= FD_SETSIZE) {
+ PARA_EMERG_LOG("fatal: tried to add invalid fd %d\n", fd);
+ exit(EXIT_FAILURE);
+ }
+ FD_SET(fd, fds);
+ *max_fileno = PARA_MAX(*max_fileno, fd);
+}
+
+/**
+ * paraslash's wrapper for fread(3)
+ *
+ * \param dest destination pointer
+ * \param nbytes size of one element
+ * \param nmemb number of elements to write
+ * \param stream the input stream
+ *
+ * \return negative on errors, zero on end of file, and the number of bytes
+ * (not elements) read on success.
+ *
+ * \sa fread(3)
+ */
+__must_check int para_fread(void *dest, size_t nbytes, size_t nmemb, FILE *stream)
+{
+ size_t res = fread(dest, nbytes, nmemb, stream);
+ if (res == nmemb)
+ return nbytes * nmemb;
+ if (feof(stream))
+ return 0;
+ return -E_FREAD;
+}