Get information about the group with a given name
#include <sys/types.h> #include <grp.h> int getgrnam_r( const char* name, struct group* grp, char* buffer, size_t bufsize, struct group** result );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The getgrnam_r() function updates the group structure pointed by grp and stores a pointer to that structure at the location pointed by result. The structure contains an entry from the group database with a matching name.
This function allocates storage referenced by the group structure from the memory provided with the buffer parameter, which is bufsize characters in size. You can determine the maximum size needed for this buffer by calling sysconf() with an argument of _SC_GETGR_R_SIZE_MAX.
The getgrnam_r() stores a NULL pointer at the location pointed by result on error or if the requested entry isn't found.
Zero for success, or an error number if an error occurred.
The getgrnam_r() function uses the following functions, and as a result, errno can be set to an error for any of these calls:
Safety: | |
---|---|
Cancellation point | Yes |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |