At a guess... When you run the program in the IDE, it opens a terminal session for an stdout/stderr output. When you run from a terminal session, that is the stdout/stderr location. (printf() writes to stdout. If you want to write to a specific file--stdout, staderr or something else, use fopen() and fprinf() below is my convention for setting up a log file for any of my own error messages...)Basic question- I am working on a C program for the RP4. When executed from inside the Geany IDE, or from a command line, a terminal window is automatically started. This is very useful for debugging via printf() statements. When the program is executed normally (autostarted from a crontab entry) no terminal appears. So far I can't find how to open up a terminal from inside the program after it is launched. Any suggestions would be appreciated.
Code:
/* Create and open log file */ sprintf(my_pid, "%d", getpid()); strcpy(logfile, "/home/ddcadmin/log/"); strcat(logfile, argv[0]); strcat(logfile, "_"); strcat(logfile, my_pid); strcat(logfile, ".log"); log_file = fopen(logfile,"w"); if(log_file == NULL) { fprintf(stderr,"Log file %s open failed. Quiting.\n", logfile); exit(-1); } printf("Diag: Log file should exist.\n"); fprintf(log_file,"Starting program ddc.c\n");Statistics: Posted by W. H. Heydt — Fri May 17, 2024 1:07 am