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add_proplist_entry - Adds an Extended File Attribute to the Extended File Attribute buffer
#include <sys/proplist.h>
int add_proplist_entry (
char *name,
int flags,
int value_size,
char *value,
char **bufptr );
The add_proplist_entry function initializes an Extended File Attribute buffer, pointed to by **bufptr, with the Extended File Attribute specified by the *name and *value parameters. The function can be called repeatedly, because it advances the Extended File Attribute buffer pointer **bufptr to the end of the current entry. An Extended File Attribute is a name and value pair that is contained in a variable-sized structure called a Property List. A Property List is part of a file's metadata and can contain abstract name and value pairs (Extended File Attributes) that can be set either by the operating system (for example, ACLs and privileges) or by a user-level application (for example, PC File Attributes).
Although not a requirement, Digital recommends that you use the sizeof_proplist_entry(3) and add_proplist_entry(3) functions to initialize the Extended File Attribute buffer passed to setproplist(3) and fsetproplist(3).
#include <sys/proplist.h>
main()
{
char *ptr, *buf, *name, *value;
int *value_len, *flags, buffer_size, min_buffer_size, ret, nbytes;
struct proplistname_args;
static char *names[] = {
"primary_name",
"secondary_name",
""
};
/*
* How big a buffer do I need to store my name and value
* pair in a property list ?
*/
buffer_size = sizeof_proplist_entry("primary_name", 18);
buffer_size += sizeof_proplist_entry("secondary_name", 13);
/*
* Malloc the buffer
*/
buf = ptr = (char *)malloc(buffer_size);
/*
* Call add_proplist_entry to initialize the buffer with
* the first name and value pair.
*/
ret = add_proplist_entry("primary_name", 0, 18,
"Primary Name Value", &ptr);
/*
* Call add_proplist_entry to initialize the buffer with
* the second name and value pair.
*/
ret += add_proplist_entry("secondary_name", 0, 13,
"Another Value", &ptr);
if (ret != buffer_size) {
printf("ret %d != buffer_size %d, ret, buffer_size);
free(buf, buffer_size);
exit(1);
}
/*
* Buffer now contains both name and value pairs. Call setproplist
* system call to actually associate name and value pairs to
* file.
*/
nbytes = setproplist("/tmp/foo", 1, buffer_size, buf);
if (nbytes < 0 || nbytes != buffer_size) {
perror("setproplist");
free(buf);
exit(1);
}
.
.
.
If successful, the function returns the number of bytes copied into the Extended File Attribute buffer.
Functions: add_proplist_entry(3), delproplist(3), fdelproplist(3), fgetproplist(3), fsetproplist(3), get_proplist_entry(3), getproplist(3), setproplist(3), sizeof_proplist_entry(3).
Files: proplist(4), sys/proplist.h.
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