PATHFIND(3GEN) String Pattern-Matching Library Functions PATHFIND(3GEN)
NAME
pathfind - search for named file in named directories
SYNOPSIS
cc [
flag ... ]
file ...
-lgen [
library ... ]
#include <libgen.h>
char *pathfind(
const char *path,
const char *name,
const char *mode);
DESCRIPTION
The
pathfind() function searches the directories named in
path for
the file
name. The directories named in
path are separated by colons
(:). The
mode argument is a string of option letters chosen from the
set
[rwxfbcdpugks]: +-------+-------------------+
|Letter | Meaning |
+-------+-------------------+
|
r | readable |
+-------+-------------------+
|
w | writable |
+-------+-------------------+
|
x | executable |
+-------+-------------------+
|
f | normal file |
+-------+-------------------+
|
b | block special |
+-------+-------------------+
|
c | character special |
+-------+-------------------+
|
d | directory |
+-------+-------------------+
|
p | FIFO (pipe) |
+-------+-------------------+
|
u | set user ID bit |
+-------+-------------------+
|
g | set group ID bit |
+-------+-------------------+
|
k | sticky bit |
+-------+-------------------+
|
s | size non-zero |
+-------+-------------------+
Options read, write, and execute are checked relative to the real
(not the effective) user
ID and group
ID of the current process.
If
name begins with a slash, it is treated as an absolute path name,
and
path is ignored.
An empty
path member is treated as the current directory. A slash (
/)
character is not prepended at the occurrence of the first match;
rather, the unadorned
name is returned.
EXAMPLES
Example 1: Example of finding the ls command using the PATH
environment variable.
To find the
ls command using the
PATH environment variable:
pathfind (getenv ("PATH"), "ls", "rx")
RETURN VALUES
The
pathfind() function returns a
(char *) value containing static,
thread-specific data that will be overwritten upon the next call from
the same thread.
If the file
name with all characteristics specified by
mode is found
in any of the directories specified by
path, then
pathfind() returns
a pointer to a string containing the member of
path, followed by a
slash character (
/), followed by
name.
If no match is found,
pathname() returns a null pointer,
((char *) 0).
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+
SEE ALSO
sh(1),
test(1),
access(2),
mknod(2),
stat(2),
getenv(3C),
attributes(7)NOTES
The string pointed to by the returned pointer is stored in an area
that is reused on subsequent calls to
pathfind(). The string should
not be deallocated by the caller.
When compiling multithreaded applications, the
_REENTRANT flag must
be defined on the compile line. This flag should only be used in
multithreadedapplications.
March 10, 1999 PATHFIND(3GEN)
