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#include <stdio.h>
#include <errno.h>
#include <unistd.h>
int main() {
int vals[] = {
_PC_LINK_MAX,
_PC_MAX_CANON,
_PC_MAX_INPUT,
_PC_NAME_MAX,
_PC_PATH_MAX,
_PC_PIPE_BUF,
_PC_REC_MIN_XFER_SIZE,
_PC_REC_XFER_ALIGN,
_PC_ALLOC_SIZE_MIN,
_PC_CHOWN_RESTRICTED,
_PC_NO_TRUNC,
_PC_2_SYMLINKS,
_PC_VDISABLE,
_PC_SYNC_IO,
_PC_ASYNC_IO,
_PC_PRIO_IO,
_PC_SOCK_MAXBUF,
_PC_REC_INCR_XFER_SIZE,
_PC_REC_MAX_XFER_SIZE,
_PC_SYMLINK_MAX,
_PC_FILESIZEBITS
};
char* names[] = {
"_PC_LINK_MAX",
"_PC_MAX_CANON",
"_PC_MAX_INPUT",
"_PC_NAME_MAX",
"_PC_PATH_MAX",
"_PC_PIPE_BUF",
"_PC_REC_MIN_XFER_SIZE",
"_PC_REC_XFER_ALIGN",
"_PC_ALLOC_SIZE_MIN",
"_PC_CHOWN_RESTRICTED",
"_PC_NO_TRUNC",
"_PC_2_SYMLINKS",
"_PC_VDISABLE",
"_PC_SYNC_IO",
"_PC_ASYNC_IO",
"_PC_PRIO_IO",
"_PC_SOCK_MAXBUF",
"_PC_REC_INCR_XFER_SIZE",
"_PC_REC_MAX_XFER_SIZE",
"_PC_SYMLINK_MAX",
"_PC_FILESIZEBITS"
};
for (int i = 0; i < sizeof vals / sizeof vals[0]; i++) {
printf("%s: %ld\n", names[i], pathconf("/", vals[i]));
printf("errno: %d\n\n", errno);
errno = 0;
}
printf("(invalid): %ld\n", pathconf("/", -123));
printf("errno: %d\n", errno);
return 0;
}
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