Linux Manuals session 3

gethostbyname, gethostbyaddr, sethostent, gethostent, endhostent, h_errno, herror, hstrerror, gethostbyaddr_r, gethostbyname2, gethostbyname2_r, gethostbyname_r, gethostent_r – get network host entry Synopsis#include <netdb.h> extern int h_errno; struct hostent *gethostbyname(const char *name); #include <sys/socket.h> /* for AF_INET */ struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type); void sethostent(int stayopen); void endhostent(void); void herror(const char *s); const char *hstrerror(int…

getgrouplist – get list of groups to which a user belongs Synopsis#include <grp.h> int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getgrouplist():     Since glibc 2.19:         _DEFAULT_SOURCE     Glibc 2.19 and earlier:         _BSD_SOURCE DescriptionThe getgrouplist() function scans the group database (see group(5)) to obtain the list of…

getgrnam, getgrnam_r, getgrgid, getgrgid_r – get group file entry Synopsis#include <sys/types.h> #include <grp.h> struct group *getgrnam(const char *name); struct group *getgrgid(gid_t gid); int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result); int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);Feature Test Macro Requirements for glibc (see…

getgrnam, getgrnam_r, getgrgid, getgrgid_r – get group file entry Synopsis#include <sys/types.h> #include <grp.h> struct group *getgrnam(const char *name); struct group *getgrgid(gid_t gid); int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result); int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);Feature Test Macro Requirements for glibc (see…

getgrnam, getgrnam_r, getgrgid, getgrgid_r – get group file entry Synopsis#include <sys/types.h> #include <grp.h> struct group *getgrnam(const char *name); struct group *getgrgid(gid_t gid); int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result); int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);Feature Test Macro Requirements for glibc (see…

getgrnam, getgrnam_r, getgrgid, getgrgid_r – get group file entry Synopsis#include <sys/types.h> #include <grp.h> struct group *getgrnam(const char *name); struct group *getgrgid(gid_t gid); int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result); int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);Feature Test Macro Requirements for glibc (see…

getgrent_r, fgetgrent_r – get group file entry reentrantly Synopsis#include <grp.h> int getgrent_r(struct group *gbuf, char *buf, size_t buflen, struct group **gbufp); int fgetgrent_r(FILE *stream, struct group *gbuf, char *buf, size_t buflen, struct group **gbufp);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getgrent_r(): _GNU_SOURCE fgetgrent_r():     Since glibc 2.19:         _DEFAULT_SOURCE     Glibc 2.19 and earlier:         _SVID_SOURCE DescriptionThe functions…

getgrent, setgrent, endgrent – get group file entry Synopsis#include <sys/types.h> #include <grp.h> struct group *getgrent(void); void setgrent(void); void endgrent(void);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setgrent(): _XOPEN_SOURCE >= 500     || /* Glibc since 2.19: */ _DEFAULT_SOURCE     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE getgrent(), endgrent(): Since glibc 2.22:     _XOPEN_SOURCE >= 500 ||         _DEFAULT_SOURCE Glibc 2.21 and earlier     _XOPEN_SOURCE >= 500         || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L         || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEDescriptionThe getgrent() function…

getr_depth, getg_depth, getb_depth, geta_depth – Extract a color component from a color in a specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr_depth(int color_depth, int c); int getg_depth(int color_depth, int c); int getb_depth(int color_depth, int c); int geta_depth(int color_depth, int c); DescriptionGiven a color in the format being used by the specified color…

getr8, getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 – Extract a color component from the specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr8(int c); int getg8(int c); int getb8(int c); int getr15(int c); int getg15(int c); int getb15(int c); int getr16(int c); int getg16(int c);…

getr8, getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 – Extract a color component from the specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr8(int c); int getg8(int c); int getb8(int c); int getr15(int c); int getg15(int c); int getb15(int c); int getr16(int c); int getg16(int c);…

getr8, getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 – Extract a color component from the specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr8(int c); int getg8(int c); int getb8(int c); int getr15(int c); int getg15(int c); int getb15(int c); int getr16(int c); int getg16(int c);…

getr8, getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 – Extract a color component from the specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr8(int c); int getg8(int c); int getb8(int c); int getr15(int c); int getg15(int c); int getb15(int c); int getr16(int c); int getg16(int c);…

getr8, getg8, getb8, getr15, getg15, getb15, getr16, getg16, getb16, getr24, getg24, getb24, getr32, getg32, getb32 – Extract a color component from the specified pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr8(int c); int getg8(int c); int getb8(int c); int getr15(int c); int getg15(int c); int getb15(int c); int getr16(int c); int getg16(int c);…

getr, getg, getb, geta – Extract a color component from the current pixel format. Allegro game programming library. Synopsis#include <allegro.h> int getr(int c); int getg(int c); int getb(int c); int geta(int c); DescriptionGiven a color in the format being used by the current video mode, these functions extract one of the red, green, blue, or…

getfsent, getfsspec, getfsfile, setfsent, endfsent – handle fstab entries Synopsis#include <fstab.h> void endfsent(void); struct fstab *getfsent(void); struct fstab *getfsfile(const char *mount_point); struct fstab *getfsspec(const char *special_file); int setfsent(void); DescriptionThese functions read from the file /etc/fstab. The struct fstab is defined by: struct fstab {     char       *fs_spec;       /* block device name */     char       *fs_file;       /* mount point */     char       *fs_vfstype;    /* file-system type */     char       *fs_mntops;     /* mount options */     const char *fs_type;       /* rw/rq/ro/sw/xx…

getfsent, getfsspec, getfsfile, setfsent, endfsent – handle fstab entries Synopsis#include <fstab.h> void endfsent(void); struct fstab *getfsent(void); struct fstab *getfsfile(const char *mount_point); struct fstab *getfsspec(const char *special_file); int setfsent(void); DescriptionThese functions read from the file /etc/fstab. The struct fstab is defined by: struct fstab {     char       *fs_spec;       /* block device name */     char       *fs_file;       /* mount point */     char       *fs_vfstype;    /* file-system type */     char       *fs_mntops;     /* mount options */     const char *fs_type;       /* rw/rq/ro/sw/xx…

getfsent, getfsspec, getfsfile, setfsent, endfsent – handle fstab entries Synopsis#include <fstab.h> void endfsent(void); struct fstab *getfsent(void); struct fstab *getfsfile(const char *mount_point); struct fstab *getfsspec(const char *special_file); int setfsent(void); DescriptionThese functions read from the file /etc/fstab. The struct fstab is defined by: struct fstab {     char       *fs_spec;       /* block device name */     char       *fs_file;       /* mount point */     char       *fs_vfstype;    /* file-system type */     char       *fs_mntops;     /* mount options */     const char *fs_type;       /* rw/rq/ro/sw/xx…

getfscreatecon, setfscreatecon – get or set the SELinux security context used for creating a new file system object Synopsis#include <selinux/selinux.h> int getfscreatecon(char **con); int getfscreatecon_raw(char **con); int setfscreatecon(char *context); int setfscreatecon_raw(char *context); Descriptiongetfscreatecon() retrieves the context used for creating a new file system object. This returned context should be freed with freecon(3) if non-NULL. getfscreatecon()…

getfscreatecon, setfscreatecon – get or set the SELinux security context used for creating a new file system object Synopsis#include <selinux/selinux.h> int getfscreatecon(char **con); int getfscreatecon_raw(char **con); int setfscreatecon(char *context); int setfscreatecon_raw(char *context); Descriptiongetfscreatecon() retrieves the context used for creating a new file system object. This returned context should be freed with freecon(3) if non-NULL. getfscreatecon()…