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On Linux systems (either 32- or 64-bit), what is the size of pid_t, uid_t, and gid_t?
784
The time_t datatype is a data type in the ISO C library defined for storing system time values. Such values are returned from the standard time() library function. This type is a typedef defined in the standard <time. h> header.
The pid_t data type is a signed integer type which is capable of representing a process ID. In the GNU library, this is an int . The getpid function returns the process ID of the current process. The getppid function returns the process ID of the parent of the current process.
Data Type: uid_t. This is an integer data type used to represent user IDs. In the GNU C Library, this is an alias for unsigned int .
#include <stdio.h> #include <sys/types.h> int main() { printf("pid_t: %zu\n", sizeof(pid_t)); printf("uid_t: %zu\n", sizeof(uid_t)); printf("gid_t: %zu\n", sizeof(gid_t)); } EDIT: Per popular request (and because, realistically, 99% of the people coming to this question are going to be running x86 or x86_64)...
On an i686 and x86_64 (so, 32-bit and 64-bit) processor running Linux >= 3.0.0, the answer is:
pid_t: 4 uid_t: 4 gid_t: 4 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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