https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102992
--- Comment #13 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Here is a complete strace of a "Hello, world" program on Linux, compiled
with -static-libgfortran (to remove some of the shared library loading :-)
and executed with
$ strace ./a.out > hello.dat
execve("./a.out", ["./a.out"], 0x7fff23679850 /* 52 vars */) = 0
brk(NULL) = 0x55795af28000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffef37f68b0) = -1 EINVAL (Invalid
argument)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=137154, ...}) = 0
mmap(NULL, 137154, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f6b9f05a000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3405\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=104984, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f6b9f058000
mmap(NULL, 107592, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6b9f03d000
mmap(0x7f6b9f040000, 73728, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f6b9f040000
mmap(0x7f6b9f052000, 16384, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3,
0x15000) = 0x7f6b9f052000
mmap(0x7f6b9f056000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0x7f6b9f056000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libquadmath.so.0", O_RDONLY|O_CLOEXEC)
= 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200:\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=297784, ...}) = 0
mmap(NULL, 299712, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6b9eff3000
mmap(0x7f6b9eff6000, 184320, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f6b9eff6000
mmap(0x7f6b9f023000, 98304, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3,
0x30000) = 0x7f6b9f023000
mmap(0x7f6b9f03b000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x47000) = 0x7f6b9f03b000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\363\0\0\0\0\0\0"..., 832) =
832
fstat(3, {st_mode=S_IFREG|0644, st_size=1369352, ...}) = 0
mmap(NULL, 1368336, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f6b9eea4000
mmap(0x7f6b9eeb3000, 684032, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f6b9eeb3000
mmap(0x7f6b9ef5a000, 618496, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3,
0xb6000) = 0x7f6b9ef5a000
mmap(0x7f6b9eff1000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14c000) = 0x7f6b9eff1000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360q\2\0\0\0\0\0"...,
832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"...,
784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0",
32, 848) = 32
pread64(3,
"\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\t\233\222%\274\260\320\31\331\326\10\204\276X>\263"...,
68, 880) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=2029224, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"...,
784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0",
32, 848) = 32
pread64(3,
"\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\t\233\222%\274\260\320\31\331\326\10\204\276X>\263"...,
68, 880) = 68
mmap(NULL, 2036952, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f6b9ecb2000
mprotect(0x7f6b9ecd7000, 1847296, PROT_NONE) = 0
mmap(0x7f6b9ecd7000, 1540096, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x25000) = 0x7f6b9ecd7000
mmap(0x7f6b9ee4f000, 303104, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3,
0x19d000) = 0x7f6b9ee4f000
mmap(0x7f6b9ee9a000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e7000) = 0x7f6b9ee9a000
mmap(0x7f6b9eea0000, 13528, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f6b9eea0000
close(3) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f6b9ecb0000
arch_prctl(ARCH_SET_FS, 0x7f6b9ecb0b80) = 0
mprotect(0x7f6b9ee9a000, 12288, PROT_READ) = 0
mprotect(0x7f6b9eff1000, 4096, PROT_READ) = 0
mprotect(0x7f6b9f03b000, 4096, PROT_READ) = 0
mprotect(0x7f6b9f056000, 4096, PROT_READ) = 0
mprotect(0x557959277000, 4096, PROT_READ) = 0
mprotect(0x7f6b9f0a9000, 4096, PROT_READ) = 0
munmap(0x7f6b9f05a000, 137154) = 0
brk(NULL) = 0x55795af28000
brk(0x55795af49000) = 0x55795af49000
fstat(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}) = 0
fstat(1, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
fstat(2, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x1), ...}) = 0
rt_sigaction(SIGQUIT, {sa_handler=0x5579592418a0, sa_mask=[QUIT],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGILL, {sa_handler=0x5579592418a0, sa_mask=[ILL],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGABRT, {sa_handler=0x5579592418a0, sa_mask=[ABRT],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGFPE, {sa_handler=0x5579592418a0, sa_mask=[FPE],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSEGV, {sa_handler=0x5579592418a0, sa_mask=[SEGV],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGBUS, {sa_handler=0x5579592418a0, sa_mask=[BUS],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSYS, {sa_handler=0x5579592418a0, sa_mask=[SYS],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTRAP, {sa_handler=0x5579592418a0, sa_mask=[TRAP],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXCPU, {sa_handler=0x5579592418a0, sa_mask=[XCPU],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXFSZ, {sa_handler=0x5579592418a0, sa_mask=[XFSZ],
sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6b9ecf8210},
{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
write(1, "Hello, world!\n", 14) = 14
exit_group(0) = ?
+++ exited with 0 +++
I see nothing untoward there, the only times file hande 1 is
referenced is by
fstat(1, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
and
write(1, "Hello, world!\n", 14) = 14
Is it possible to run an equivalent command on MacOS to see
what is going on there?
