5 /* open/read/write/close */
8 /* Signals handling.. */
11 /** If buffer is too small to hold entire string, it is incremented by this value */
12 #define BUFFER_STEP 16
14 /** Buffer used to store line of characters */
17 /** Named pipe used to communnicate with process2 */
18 char * write_pipe = "/tmp/process1pipe";
20 /** File descriptor of pipe */
24 * Handler for signals.
26 void sig_handler(int signo)
28 if (signo == SIGUSR1) {
29 fprintf(stderr, "[%s] Received SIGUSR1!\n", "process1");
31 else if (signo == SIGTERM) {
32 fprintf(stderr, "[%s] Received SIGTERM!\n", "process1");
33 fprintf(stderr, "[%s] > Releasing resources\n", "process1");
43 else if (signo == SIGINT) {
44 fprintf(stderr, "[%s] Received SIGINT!\n", "process1");
45 fprintf(stderr, "[%s] > Closing pipe\n", "process1");
48 else if (signo == SIGCONT) {
49 fprintf(stderr, "[%s] Received SIGCONT!\n", "process1");
50 fprintf(stderr, "[%s] > Opening pipe\n", "process1");
51 file_descriptor = open(write_pipe, O_WRONLY);
56 * Program reads entire lines of text from the standard input and pass them
57 * to the process2 using created pipe.
60 /** Currently fetched from stdin character */
63 /** Current buffer length*/
64 int buffer_length = 0;
66 /** Index of the current character */
70 * Temporary buffer used as a proxy between
71 * checking memory allocation and copying data to real buffer
75 fprintf(stderr, "[%s] Init!\n", "process1");
78 * Register signals handled by process
80 if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
81 fprintf(stderr, "can't catch SIGUSR1\n");
83 if (signal(SIGTERM, sig_handler) == SIG_ERR) {
84 fprintf(stderr, "can't catch SIGTERM\n");
86 if (signal(SIGINT, sig_handler) == SIG_ERR) {
87 fprintf(stderr, "can't catch SIGINT\n");
89 if (signal(SIGCONT, sig_handler) == SIG_ERR) {
90 fprintf(stderr, "can't catch SIGCONT\n");
93 mkfifo(write_pipe, 0666);
95 file_descriptor = open(write_pipe, O_WRONLY);
101 * Check if current index is bigger than current buffer size.
102 * If so increment buffer size. On error release memory, and set
105 if (i >= buffer_length) {
107 buffer_length += BUFFER_STEP;
108 tmp = (char*) realloc(buffer, buffer_length);
110 fprintf(stderr, "[%s] Memory allocation problem on read!\n", "process1");
118 * If there were no errors or it was not just an empty newline:
121 if (c != EOF || ((i == 0) && (c == 10))) {
122 /* If newline has been found
123 * return entire string and release the memory
125 if (c == 10 && (i != 0)) {
127 write(file_descriptor, buffer, strlen(buffer));
128 fprintf(stderr, "[%s] buffer: %s/%d\n", "process1", buffer, strlen(buffer));
138 * Normal character, add it to the buffer
144 /* Used only for debugging..*/
146 printf("c: %c/%d, i: %d, bl: %d\n", c, c, i, buffer_length);
153 /* Release resources in normal program flow exit. */