63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/*
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* Test name: test09.c
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*
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* Objetive: The purpose of this test is to make sure that select works
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* when working with the terminal.
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*
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* Description: This tests wait entry from stdin using select and displays
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* it again in stdout when it is ready to write (which is always)
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*
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* Jose M. Gomez
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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void main(void) {
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fd_set fds_read, fds_write;
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int retval;
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char data[1024];
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FD_ZERO(&fds_read);
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FD_ZERO(&fds_write);
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FD_SET(0, &fds_read); /* stdin */
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FD_SET(1, &fds_write); /* stdout */
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while(1) {
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printf("Input some data: ");
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fflush(stdout);
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retval=select(3, &fds_read, NULL, NULL, NULL);
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if (retval < 0) {
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fprintf(stderr, "Error while executing select\n");
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exit(-1);
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}
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printf("select retval: %d\n", retval);
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if (!FD_ISSET(0, &fds_read)) {
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fprintf(stderr, "Error: stdin not ready (?)\n");
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exit(-1);
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}
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printf("gets..\n");
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gets(data);
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printf("gets done..\n");
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if (!strcmp(data, "exit"))
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exit(0);
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printf("Try to write it back\n");
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retval=select(3, NULL, &fds_write, NULL, NULL);
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if (retval < 0) {
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fprintf(stderr, "Error while executing select\n");
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exit(-1);
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}
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if (!FD_ISSET(1, &fds_write)) {
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fprintf(stderr, "Error: stdout not ready (?)\n");
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exit(-1);
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}
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printf("Data: %s\n", data);
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}
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}
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