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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/test/test-sizeof.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/test/test-sizeof.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/test/test-sizeof.c b/src/test/test-sizeof.c new file mode 100644 index 0000000..a4b4189 --- /dev/null +++ b/src/test/test-sizeof.c @@ -0,0 +1,112 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <sched.h> +#include <stdio.h> +#include <string.h> +#include <sys/timex.h> +#include <sys/types.h> +#include <sys/socket.h> + +#define __STDC_WANT_IEC_60559_TYPES_EXT__ +#include <float.h> + +#include "time-util.h" + +/* Print information about various types. Useful when diagnosing + * gcc diagnostics on an unfamiliar architecture. */ + +DISABLE_WARNING_TYPE_LIMITS; + +#define info_no_sign(t) \ + printf("%s → %zu bits, %zu byte alignment\n", STRINGIFY(t), \ + sizeof(t)*CHAR_BIT, \ + __alignof__(t)) + +#define info(t) \ + printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t), \ + sizeof(t)*CHAR_BIT, \ + strstr(STRINGIFY(t), "signed") ? "" : \ + (t)-1 < (t)0 ? ", signed" : ", unsigned", \ + __alignof__(t)) + +enum Enum { + enum_value, +}; + +enum BigEnum { + big_enum_value = UINT64_C(1), +}; + +enum BigEnum2 { + big_enum2_pos = UINT64_C(1), + big_enum2_neg = UINT64_C(-1), +}; + +int main(void) { + int (*function_pointer)(void); + + info_no_sign(function_pointer); + info_no_sign(void*); + info(char*); + + info(char); + info(signed char); + info(unsigned char); + info(short unsigned); + info(unsigned); + info(unsigned long); + info(unsigned long long); +#ifdef __GLIBC__ + info(__syscall_ulong_t); + info(__syscall_slong_t); +#endif + info(intmax_t); + info(uintmax_t); + + info(float); + info(double); + info(long double); + +#ifdef FLT128_MAX + info(_Float128); + info(_Float64); + info(_Float64x); + info(_Float32); + info(_Float32x); +#endif + + info(size_t); + info(ssize_t); + info(time_t); + info(usec_t); +#ifdef __GLIBC__ + info(__time_t); +#endif + info(pid_t); + info(uid_t); + info(gid_t); + info(socklen_t); + +#ifdef __GLIBC__ + info(__cpu_mask); +#endif + + info(enum Enum); + info(enum BigEnum); + info(enum BigEnum2); + assert_cc(sizeof(enum BigEnum2) == 8); + printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos)); + printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg)); + + printf("timeval: %zu\n", sizeof(struct timeval)); + printf("timespec: %zu\n", sizeof(struct timespec)); + + void *x = malloc(100); + + printf("local variable: %p\n", &function_pointer); + printf("glibc function: %p\n", memcpy); + printf("heap allocation: %p\n", x); + free(x); + + return 0; +} |