system_call specifies the system call by its name

cat /usr/include/asm/unistd_64.h
ifndef _ASM_X86_UNISTD_64_H
define _ASM_X86_UNISTD_64_H 1
define __NR_read 0
define __NR_write 1
define __NR_open 2
define __NR_close 3
define __NR_stat 4
define __NR_fstat 5
define __NR_lstat 6
define __NR_poll 7
define __NR_lseek 8
define __NR_mmap 9
define __NR_mprotect 10
define __NR_munmap 11
define __NR_brk 12
define __NR_rt_sigaction 13
define __NR_rt_sigprocmask 14
define __NR_rt_sigreturn 15
define __NR_ioctl 16
define __NR_pread64 17
define __NR_pwrite64 18
define __NR_readv 19
define __NR_writev 20
define __NR_access 21
define __NR_pipe 22
define __NR_select 23
define __NR_sched_yield 24
define __NR_mremap 25
define __NR_msync 26
define __NR_mincore 27
define __NR_madvise 28
define __NR_shmget 29
define __NR_shmat 30
define __NR_shmctl 31
define __NR_dup 32
define __NR_dup2 33
define __NR_pause 34
define __NR_nanosleep 35
define __NR_getitimer 36
define __NR_alarm 37
define __NR_setitimer 38
define __NR_getpid 39
define __NR_sendfile 40
define __NR_socket 41
define __NR_connect 42
define __NR_accept 43
define __NR_sendto 44
define __NR_recvfrom 45
define __NR_sendmsg 46
define __NR_recvmsg 47
define __NR_shutdown 48
define __NR_bind 49
define __NR_listen 50
define __NR_getsockname 51
define __NR_getpeername 52
define __NR_socketpair 53
define __NR_setsockopt 54
define __NR_getsockopt 55
define __NR_clone 56
define __NR_fork 57
define __NR_vfork 58
define __NR_execve 59
define __NR_exit 60
define __NR_wait4 61
define __NR_kill 62
define __NR_uname 63
define __NR_semget 64
define __NR_semop 65
define __NR_semctl 66
define __NR_shmdt 67
define __NR_msgget 68
define __NR_msgsnd 69
define __NR_msgrcv 70
define __NR_msgctl 71
define __NR_fcntl 72
define __NR_flock 73
define __NR_fsync 74
define __NR_fdatasync 75
define __NR_truncate 76
define __NR_ftruncate 77
define __NR_getdents 78
define __NR_getcwd 79
define __NR_chdir 80
define __NR_fchdir 81
define __NR_rename 82
define __NR_mkdir 83
define __NR_rmdir 84
define __NR_creat 85
define __NR_link 86
define __NR_unlink 87
define __NR_symlink 88
define __NR_readlink 89
define __NR_chmod 90
define __NR_fchmod 91
define __NR_chown 92
define __NR_fchown 93
define __NR_lchown 94
define __NR_umask 95
define __NR_gettimeofday 96
define __NR_getrlimit 97
define __NR_getrusage 98
define __NR_sysinfo 99
define __NR_times 100
define __NR_ptrace 101
define __NR_getuid 102
define __NR_syslog 103
define __NR_getgid 104
define __NR_setuid 105
define __NR_setgid 106
define __NR_geteuid 107
define __NR_getegid 108
define __NR_setpgid 109
define __NR_getppid 110
define __NR_getpgrp 111
define __NR_setsid 112
define __NR_setreuid 113
define __NR_setregid 114
define __NR_getgroups 115
define __NR_setgroups 116
define __NR_setresuid 117
define __NR_getresuid 118
define __NR_setresgid 119
define __NR_getresgid 120
define __NR_getpgid 121
define __NR_setfsuid 122
define __NR_setfsgid 123
define __NR_getsid 124
define __NR_capget 125
define __NR_capset 126
define __NR_rt_sigpending 127
define __NR_rt_sigtimedwait 128
define __NR_rt_sigqueueinfo 129
define __NR_rt_sigsuspend 130
define __NR_sigaltstack 131
define __NR_utime 132
define __NR_mknod 133
define __NR_uselib 134
define __NR_personality 135
define __NR_ustat 136
define __NR_statfs 137
define __NR_fstatfs 138
define __NR_sysfs 139
define __NR_getpriority 140
define __NR_setpriority 141
define __NR_sched_setparam 142
define __NR_sched_getparam 143
define __NR_sched_setscheduler 144
define __NR_sched_getscheduler 145
define __NR_sched_get_priority_max 146
define __NR_sched_get_priority_min 147
define __NR_sched_rr_get_interval 148
define __NR_mlock 149
define __NR_munlock 150
define __NR_mlockall 151
define __NR_munlockall 152
define __NR_vhangup 153
define __NR_modify_ldt 154
define __NR_pivot_root 155
define __NR__sysctl 156
define __NR_prctl 157
define __NR_arch_prctl 158
define __NR_adjtimex 159
define __NR_setrlimit 160
define __NR_chroot 161
define __NR_sync 162
define __NR_acct 163
define __NR_settimeofday 164
define __NR_mount 165
define __NR_umount2 166
define __NR_swapon 167
define __NR_swapoff 168
define __NR_reboot 169
define __NR_sethostname 170
define __NR_setdomainname 171
define __NR_iopl 172
define __NR_ioperm 173
define __NR_create_module 174
define __NR_init_module 175
define __NR_delete_module 176
define __NR_get_kernel_syms 177
define __NR_query_module 178
define __NR_quotactl 179
define __NR_nfsservctl 180
define __NR_getpmsg 181
define __NR_putpmsg 182
define __NR_afs_syscall 183
define __NR_tuxcall 184
define __NR_security 185
define __NR_gettid 186
define __NR_readahead 187
define __NR_setxattr 188
define __NR_lsetxattr 189
define __NR_fsetxattr 190
define __NR_getxattr 191
define __NR_lgetxattr 192
define __NR_fgetxattr 193
define __NR_listxattr 194
define __NR_llistxattr 195
define __NR_flistxattr 196
define __NR_removexattr 197
define __NR_lremovexattr 198
define __NR_fremovexattr 199
define __NR_tkill 200
define __NR_time 201
define __NR_futex 202
define __NR_sched_setaffinity 203
define __NR_sched_getaffinity 204
define __NR_set_thread_area 205
define __NR_io_setup 206
define __NR_io_destroy 207
define __NR_io_getevents 208
define __NR_io_submit 209
define __NR_io_cancel 210
define __NR_get_thread_area 211
define __NR_lookup_dcookie 212
define __NR_epoll_create 213
define __NR_epoll_ctl_old 214
define __NR_epoll_wait_old 215
define __NR_remap_file_pages 216
define __NR_getdents64 217
define __NR_set_tid_address 218
define __NR_restart_syscall 219
define __NR_semtimedop 220
define __NR_fadvise64 221
define __NR_timer_create 222
define __NR_timer_settime 223
define __NR_timer_gettime 224
define __NR_timer_getoverrun 225
define __NR_timer_delete 226
define __NR_clock_settime 227
define __NR_clock_gettime 228
define __NR_clock_getres 229
define __NR_clock_nanosleep 230
define __NR_exit_group 231
define __NR_epoll_wait 232
define __NR_epoll_ctl 233
define __NR_tgkill 234
define __NR_utimes 235
define __NR_vserver 236
define __NR_mbind 237
define __NR_set_mempolicy 238
define __NR_get_mempolicy 239
define __NR_mq_open 240
define __NR_mq_unlink 241
define __NR_mq_timedsend 242
define __NR_mq_timedreceive 243
define __NR_mq_notify 244
define __NR_mq_getsetattr 245
define __NR_kexec_load 246
define __NR_waitid 247
define __NR_add_key 248
define __NR_request_key 249
define __NR_keyctl 250
define __NR_ioprio_set 251
define __NR_ioprio_get 252
define __NR_inotify_init 253
define __NR_inotify_add_watch 254
define __NR_inotify_rm_watch 255
define __NR_migrate_pages 256
define __NR_openat 257
define __NR_mkdirat 258
define __NR_mknodat 259
define __NR_fchownat 260
define __NR_futimesat 261
define __NR_newfstatat 262
define __NR_unlinkat 263
define __NR_renameat 264
define __NR_linkat 265
define __NR_symlinkat 266
define __NR_readlinkat 267
define __NR_fchmodat 268
define __NR_faccessat 269
define __NR_pselect6 270
define __NR_ppoll 271
define __NR_unshare 272
define __NR_set_robust_list 273
define __NR_get_robust_list 274
define __NR_splice 275
define __NR_tee 276
define __NR_sync_file_range 277
define __NR_vmsplice 278
define __NR_move_pages 279
define __NR_utimensat 280
define __NR_epoll_pwait 281
define __NR_signalfd 282
define __NR_timerfd_create 283
define __NR_eventfd 284
define __NR_fallocate 285
define __NR_timerfd_settime 286
define __NR_timerfd_gettime 287
define __NR_accept4 288
define __NR_signalfd4 289
define __NR_eventfd2 290
define __NR_epoll_create1 291
define __NR_dup3 292
define __NR_pipe2 293
define __NR_inotify_init1 294
define __NR_preadv 295
define __NR_pwritev 296
define __NR_rt_tgsigqueueinfo 297
define __NR_perf_event_open 298
define __NR_recvmmsg 299
define __NR_fanotify_init 300
define __NR_fanotify_mark 301
define __NR_prlimit64 302
define __NR_name_to_handle_at 303
define __NR_open_by_handle_at 304
define __NR_clock_adjtime 305
define __NR_syncfs 306
define __NR_sendmmsg 307
define __NR_setns 308
define __NR_getcpu 309
define __NR_process_vm_readv 310
define __NR_process_vm_writev 311
define __NR_kcmp 312
define __NR_finit_module 313
define __NR_sched_setattr 314
define __NR_sched_getattr 315
define __NR_renameat2 316
define __NR_seccomp 317
define __NR_getrandom 318
define __NR_memfd_create 319
define __NR_kexec_file_load 320
define __NR_userfaultfd 323
define __NR_copy_file_range 326
define __NR_pkey_mprotect 329
define __NR_pkey_alloc 330
define __NR_pkey_free 331
endif /* _ASM_X86_UNISTD_64_H */