intro - Introduction to library functions
Section 3 reference pages describe functions that may be
found in various libraries. The library functions are
those other than the functions that directly invoke Tru64
UNIX system primitives, described in Section 2 reference
pages.
Some reference pages in Section 3 may contain suffixes to
allow their files to exist with those of other reference
pages having the same base name and section number. When
used, suffixes are made up of one to four letters. See
the man(1) reference page for more information on suffixes.
To use the reentrant functions and data structures identified
as "obsolete" in Section 3 reference pages, it is
necessary to define the preprocessor symbol _REENTRANT
prior to including the associated include file. If this is
not done, prototypes and supplementary data structures for
these functions may not be defined. This symbol is
defined for you if you use the -threads or -pthread
switches to the cc or c89 command.
All libc functions are threadsafe unless otherwise indicated
on their respective reference pages. The following
table lists non-threadsafe libc functions and their
threadsafe equivalents (which are provided in libc.so for
use in multithreaded applications):
---------------------------------------
Not Threadsafe Threadsafe Equivalent
---------------------------------------
asctime asctime_r
ctime ctime_r
endpwent endpwent_r
fgetgrent fgetgrent_r
fgetpwent fgetpwent_r
getgrent getgrent_r
getgrgid getgrgid_r
getgrname getgrname_r
getpwent getpwent_r
getpwnam getpwnam_r
getpwuid getpwuid_r
gmtime gmtime_r
localtime localtime_r
rand rand_r
readdir readdir_r
setpwent setpwent_r
strtok strtok_r
---------------------------------------
The following functions are not threadsafe and do not have
threadsafe equivalents: registerrpc, svc_destroy,
svc_freeargs, svc_getargs, svc_getcaller, svc_getreq,
svc_getreqset, svc_register, svc_run, svc_sendreply,
svc_unregister, svcerr_auth, svcerr_decode, svcerr_noproc,
svcerr_noprog, svcerr_progvers, svcerr_systemerr,
svcerr_weakauth, svcfd_create, svcraw_create, svctcp_create,
svcudp_create, xprt_register, xprt_unregister
Functions in the math library may return conventional values
when the function is undefined for the given arguments
or when the value is not representable. In these cases,
the external variable errno is set to the value of EDOM
(domain error) or ERANGE (range error). For further
information, see intro(2). The values of EDOM and ERANGE
are defined in the include file <math.h>.
/usr/lib/libc.a
/usr/lib/libcP.a
/usr/lib/libm.a
/usr/lib/libcV.a
cc(1), ld(1), nm(1), intro(2)
intro(3)
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