1GETGID(2) Linux Programmer's Manual GETGID(2)
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6 getgid, getegid - get group identity
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9 #include <unistd.h>
10 #include <sys/types.h>
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12 gid_t getgid(void);
13 gid_t getegid(void);
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16 getgid() returns the real group ID of the calling process.
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18 getegid() returns the effective group ID of the calling process.
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21 These functions are always successful.
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24 POSIX.1-2001, POSIX.1-2008, 4.3BSD.
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27 The original Linux getgid() and getegid() system calls supported only
28 16-bit group IDs. Subsequently, Linux 2.4 added getgid32() and gete‐
29 gid32(), supporting 32-bit IDs. The glibc getgid() and getegid() wrap‐
30 per functions transparently deal with the variations across kernel ver‐
31 sions.
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34 getresgid(2), setgid(2), setregid(2), credentials(7)
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37 This page is part of release 4.15 of the Linux man-pages project. A
38 description of the project, information about reporting bugs, and the
39 latest version of this page, can be found at
40 https://www.kernel.org/doc/man-pages/.
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44Linux 2017-09-15 GETGID(2)