getpw(3) Library Functions Manual getpw(3) NAME getpw - reconstruct password line entry LIBRARY Standard C library (libc, -lc) SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sys/types.h> #include <pwd.h> [[deprecated]] int getpw(uid_t uid, char *buf); DESCRIPTION The getpw() function reconstructs the password line entry for the given user ID uid in the buffer buf. The returned buffer contains a line of format name:passwd:uid:gid:gecos:dir:shell The passwd structure is defined in <pwd.h> as follows: struct passwd { char *pw_name; /* username */ char *pw_passwd; /* user password */ uid_t pw_uid; /* user ID */ gid_t pw_gid; /* group ID */ char *pw_gecos; /* user information */ char *pw_dir; /* home directory */ char *pw_shell; /* shell program */ }; For more information about the fields of this structure, see passwd(5). RETURN VALUE The getpw() function returns 0 on success; on error, it returns -1, and errno is set to indicate the error. If uid is not found in the password database, getpw() returns -1, sets errno to 0, and leaves buf unchanged. ERRORS 0 or ENOENT No user corresponding to uid. EINVAL buf is NULL. ENOMEM Insufficient memory to allocate passwd structure. FILES /etc/passwd password database file ATTRIBUTES For an explanation of the terms used in this section, see at- tributes(7). ┌─────────────────────────────────────┬───────────────┬────────────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼────────────────┤ │getpw() │ Thread safety │ MT-Safe locale │ └─────────────────────────────────────┴───────────────┴────────────────┘ STANDARDS SVr2. BUGS The getpw() function is dangerous as it may overflow the provided buf- fer buf. It is obsoleted by getpwuid(3). SEE ALSO endpwent(3), fgetpwent(3), getpwent(3), getpwnam(3), getpwuid(3), putp- went(3), setpwent(3), passwd(5) Linux man-pages 6.03 2022-12-15 getpw(3)
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