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Diffstat (limited to 'man3/getgrent_r.3')
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diff --git a/man3/getgrent_r.3 b/man3/getgrent_r.3 deleted file mode 100644 index f4a2b5b..0000000 --- a/man3/getgrent_r.3 +++ /dev/null @@ -1,228 +0,0 @@ -'\" t -.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl) -.\" -.\" SPDX-License-Identifier: GPL-2.0-or-later -.\" -.TH getgrent_r 3 2023-10-31 "Linux man-pages 6.7" -.SH NAME -getgrent_r, fgetgrent_r \- get group file entry reentrantly -.SH LIBRARY -Standard C library -.RI ( libc ", " \-lc ) -.SH SYNOPSIS -.nf -.B #include <grp.h> -.P -.BI "int getgrent_r(struct group *restrict " gbuf , -.BI " char " buf "[restrict ." buflen "], size_t " buflen , -.BI " struct group **restrict " gbufp ); -.BI "int fgetgrent_r(FILE *restrict " stream ", struct group *restrict " gbuf , -.BI " char " buf "[restrict ." buflen "], size_t " buflen , -.BI " struct group **restrict " gbufp ); -.fi -.P -.RS -4 -Feature Test Macro Requirements for glibc (see -.BR feature_test_macros (7)): -.RE -.P -.BR getgrent_r (): -.nf - _GNU_SOURCE -.fi -.\" FIXME . The FTM requirements seem inconsistent here. File a glibc bug? -.P -.BR fgetgrent_r (): -.nf - Since glibc 2.19: - _DEFAULT_SOURCE - glibc 2.19 and earlier: - _SVID_SOURCE -.fi -.SH DESCRIPTION -The functions -.BR getgrent_r () -and -.BR fgetgrent_r () -are the reentrant versions of -.BR getgrent (3) -and -.BR fgetgrent (3). -The former reads the next group entry from the stream initialized by -.BR setgrent (3). -The latter reads the next group entry from -.IR stream . -.P -The \fIgroup\fP structure is defined in -.I <grp.h> -as follows: -.P -.in +4n -.EX -struct group { - char *gr_name; /* group name */ - char *gr_passwd; /* group password */ - gid_t gr_gid; /* group ID */ - char **gr_mem; /* NULL\-terminated array of pointers - to names of group members */ -}; -.EE -.in -.P -For more information about the fields of this structure, see -.BR group (5). -.P -The nonreentrant functions return a pointer to static storage, -where this static storage contains further pointers to group -name, password, and members. -The reentrant functions described here return all of that in -caller-provided buffers. -First of all there is the buffer -.I gbuf -that can hold a \fIstruct group\fP. -And next the buffer -.I buf -of size -.I buflen -that can hold additional strings. -The result of these functions, the \fIstruct group\fP read from the stream, -is stored in the provided buffer -.IR *gbuf , -and a pointer to this \fIstruct group\fP is returned in -.IR *gbufp . -.SH RETURN VALUE -On success, these functions return 0 and -.I *gbufp -is a pointer to the \fIstruct group\fP. -On error, these functions return an error value and -.I *gbufp -is NULL. -.SH ERRORS -.TP -.B ENOENT -No more entries. -.TP -.B ERANGE -Insufficient buffer space supplied. -Try again with larger buffer. -.SH ATTRIBUTES -For an explanation of the terms used in this section, see -.BR attributes (7). -.TS -allbox; -lb lb lbx -l l l. -Interface Attribute Value -T{ -.na -.nh -.BR getgrent_r () -T} Thread safety T{ -.na -.nh -MT-Unsafe race:grent locale -T} -T{ -.na -.nh -.BR fgetgrent_r () -T} Thread safety T{ -.na -.nh -MT-Safe -T} -.TE -.P -In the above table, -.I grent -in -.I race:grent -signifies that if any of the functions -.BR setgrent (3), -.BR getgrent (3), -.BR endgrent (3), -or -.BR getgrent_r () -are used in parallel in different threads of a program, -then data races could occur. -.SH VERSIONS -Other systems use the prototype -.P -.in +4n -.EX -struct group *getgrent_r(struct group *grp, char *buf, - int buflen); -.EE -.in -.P -or, better, -.P -.in +4n -.EX -int getgrent_r(struct group *grp, char *buf, int buflen, - FILE **gr_fp); -.EE -.in -.SH STANDARDS -GNU. -.SH HISTORY -These functions are done in a style resembling -the POSIX version of functions like -.BR getpwnam_r (3). -.SH NOTES -The function -.BR getgrent_r () -is not really reentrant since it shares the reading position -in the stream with all other threads. -.SH EXAMPLES -.\" SRC BEGIN (getgrent_r.c) -.EX -#define _GNU_SOURCE -#include <grp.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#define BUFLEN 4096 -\& -int -main(void) -{ - struct group grp; - struct group *grpp; - char buf[BUFLEN]; - int i; -\& - setgrent(); - while (1) { - i = getgrent_r(&grp, buf, sizeof(buf), &grpp); - if (i) - break; - printf("%s (%jd):", grpp\->gr_name, (intmax_t) grpp\->gr_gid); - for (size_t j = 0; ; j++) { - if (grpp\->gr_mem[j] == NULL) - break; - printf(" %s", grpp\->gr_mem[j]); - } - printf("\en"); - } - endgrent(); - exit(EXIT_SUCCESS); -} -.EE -.\" perhaps add error checking - should use strerror_r -.\" #include <errno.h> -.\" #include <stdlib.h> -.\" if (i) { -.\" if (i == ENOENT) -.\" break; -.\" printf("getgrent_r: %s", strerror(i)); -.\" exit(EXIT_FAILURE); -.\" } -.\" SRC END -.SH SEE ALSO -.BR fgetgrent (3), -.BR getgrent (3), -.BR getgrgid (3), -.BR getgrnam (3), -.BR putgrent (3), -.BR group (5) |