syslim/t_fpathconf.c

This is syslim/t_fpathconf.c (Listing 11-2, page 218), an example from the book, The Linux Programming Interface.

The source code file is copyright 2024, Michael Kerrisk, and is licensed under the GNU General Public License, version 3.

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In the listing below, the names of Linux system calls and C library functions are hyperlinked to manual pages from the Linux man-pages project, and the names of functions implemented in the book are hyperlinked to the implementations of those functions.

  Cover of The Linux Programming Interface
+/* t_fpathconf.c
+
+   Demonstrate the use of fpathconf() to retrieve the values of
+   pathname-related limits.
+*/
 #include "tlpi_hdr.h"
 
 static void             /* Print 'msg' plus value of fpathconf(fd, name) */
 fpathconfPrint(const char *msg, int fd, int name)
 {
     long lim;
 
     errno = 0;
     lim = fpathconf(fd, name);
     if (lim != -1) {        /* Call succeeded, limit determinate */
         printf("%s %ld\n", msg, lim);
     } else {
         if (errno == 0)     /* Call succeeded, limit indeterminate */
             printf("%s (indeterminate)\n", msg);
         else                /* Call failed */
             errExit("fpathconf %s", msg);
     }
 }
 
 int
 main(int argc, char *argv[])
 {
     fpathconfPrint("_PC_NAME_MAX: ", STDIN_FILENO, _PC_NAME_MAX);
     fpathconfPrint("_PC_PATH_MAX: ", STDIN_FILENO, _PC_PATH_MAX);
     fpathconfPrint("_PC_PIPE_BUF: ", STDIN_FILENO, _PC_PIPE_BUF);
     exit(EXIT_SUCCESS);
 }

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