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getspnam(3C) Standard C Library Functions getspnam(3C) NAME getspnam, getspnam_r, getspent, getspent_r, setspent, endspent, fget- spent, fgetspent_r - get password entry SYNOPSIS #include <shadow.h> struct spwd *getspnam(const char *name); struct spwd *getspnam_r(const char *name, struct spwd *result, char *buffer, int buflen); struct spwd *getspent(void); struct spwd *getspent_r(struct spwd *result, char *buffer, int buflen); void setspent(void); void endspent(void); struct spwd *fgetspent(FILE *fp); struct spwd *fgetspent_r(FILE *fp, struct spwd *result, char *buffer, int buflen); DESCRIPTION These functions are used to obtain shadow password entries. An entry may come from any of the sources for shadow specified in the /etc/nss- witch.conf file (see nsswitch.conf(4)). The getspnam() function searches for a shadow password entry with the login name specified by the character string argument name. The setspent(), getspent(), and endspent() functions are used to enu- merate shadow password entries from the database. The setspent() function sets (or resets) the enumeration to the begin- ning of the set of shadow password entries. This function should be called before the first call to getspent(). Calls to getspnam() leave the enumeration position in an indeterminate state. Successive calls to getspent() return either successive entries or NULL, indicating the end of the enumeration. The endspent() function may be called to indicate that the caller ex- pects to do no further shadow password retrieval operations; the system may then close the shadow password file, deallocate resources it was using, and so forth. It is still allowed, but possibly less efficient, for the process to call more shadow password functions after calling endspent(). The fgetspent() function, unlike the other functions above, does not use nsswitch.conf; it reads and parses the next line from the stream fp, which is assumed to have the format of the shadow file (see shadow(4)). Reentrant Interfaces The getspnam(), getspent(), and fgetspent() functions use thread-spe- cific data storage that is reused in each call to one of these func- tions by the same thread, making them safe to use but not recommended for multithreaded applications. The getspnam_r(), getspent_r(), and fgetspent_r() functions provide reentrant interfaces for these operations. Each reentrant interface performs the same operation as its non-reen- trant counterpart, named by removing the _r suffix. The reentrant in- terfaces, however, use buffers supplied by the caller to store returned results, and are safe for use in both single-threaded and multi- threaded applications. Each reentrant interface takes the same argument as its non-reentrant counterpart, as well as the following additional arguments. The result argument must be a pointer to a struct spwd structure allocated by the caller. On successful completion, the function returns the shadow password entry in this structure. The buffer argument must be a pointer to a buffer supplied by the caller. This buffer is used as storage space for the shadow password data. All of the pointers within the returned struct spwd result point to data stored within this buffer (see RETURN VALUES). The buffer must be large enough to hold all of the data associated with the shadow password entry. The buflen argument should give the size in bytes of the buffer indicated by buffer. For enumeration in multithreaded applications, the position within the enumeration is a process-wide property shared by all threads. The set- spent() function may be used in a multithreaded application but resets the enumeration position for all threads. If multiple threads inter- leave calls to getspent_r(), the threads will enumerate disjoint sub- sets of the shadow password database. Like its non-reentrant counterpart, getspnam_r() leaves the enumeration position in an indeterminate state. RETURN VALUES Password entries are represented by the struct spwd structure defined in <shadow.h>: struct spwd{ char *sp_namp; /* login name */ char *sp_pwdp; /* encrypted passwd */ long sp_lstchg; /* date of last change */ long sp_min; /* min days to passwd change */ long sp_max; /* max days to passwd change*/ long sp_warn; /* warning period */ long sp_inact; /* max days inactive */ long sp_expire; /* account expiry date */ unsigned long sp_flag; /* not used */ }; See shadow(4) for more information on the interpretation of this data. The getspnam()and getspnam_r() functions each return a pointer to a struct spwd if they successfully locate the requested entry; otherwise they return NULL. The getspent(), getspent_r(), fgetspent(), and fgetspent() functions each return a pointer to a struct spwd if they successfully enumerate an entry; otherwise they return NULL, indicating the end of the enumer- ation. The getspnam(), getspent(), and fgetspent() functions use thread-spe- cific data storage, so returned data must be copied before a subsequent call to any of these functions if the data is to be saved. When the pointer returned by the reentrant functions getspnam_r(), get- spent_r(), and fgetspent_r() is non-null, it is always equal to the re- sult pointer that was supplied by the caller. ERRORS The reentrant functions getspnam_r(), getspent_r(), and fgetspent_r() will return NULL and set errno to ERANGE if the length of the buffer supplied by caller is not large enough to store the result. See in- tro(2) for the proper usage and interpretation of errno in multi- threaded applications. ATTRIBUTES See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |See "Reentrant Interfaces" | | |in DESCRIPTION. | +-----------------------------+-----------------------------+ SEE ALSO nispasswd(1), passwd(1), yppasswd(1), intro(3), getlogin(3C), getpw- nam(3C), nsswitch.conf(4), passwd(4), shadow(4), attributes(5) WARNINGS The reentrant interfaces getspnam_r(), getspent_r(), and fgetspent_r() are included in this release on an uncommitted basis only, and are sub- ject to change or removal in future minor releases. NOTES When compiling multithreaded applications, see intro(3), Notes On Mul- tithreaded Applications, for information about the use of the _REEN- TRANT flag. Use of the enumeration interfaces getspent() and getspent_r() is not recommended; enumeration is supported for the shadow file, NIS, and NIS+, but in general is not efficient and may not be supported for all database sources. The semantics of enumeration are discussed further in nsswitch.conf(4). Access to shadow password information may be restricted in a manner de- pending on the database source being used. Access to the /etc/shadow file is generally restricted to processes running with the effective uid of the file owner of the {PRIV_FILE_DAC_READ} privilege. Other database sources may impose stronger or less stringent restrictions. When NIS is used as the database source, the information for the shadow password entries is obtained from the ``passwd.byname'' map. This map stores only the information for the sp_namp and sp_pwdp fields of the struct spwd structure. Shadow password entries obtained from NIS will contain the value -1 in the remainder of the fields. When NIS+ is used as the database source, and the caller lacks the per- mission needed to retrieve the encrypted password from the NIS+ ``passwd.org_dir'' table, the NIS+ service returns the string ``*NP*'' instead of the actual encrypted password string. The functions de- scribed on this page will then return the string ``*NP*'' to the caller as the value of the member sp_pwdp in the returned shadow password structure. SunOS 5.10 18 May 2004 getspnam(3C)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO | WARNINGS | NOTES
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